Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2021.0717
Linux kernel: Multiple vulnerabilities
26 February 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Modify Arbitrary Files -- Existing Account
Denial of Service -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20177 CVE-2021-3178 CVE-2020-35508
CVE-2020-29661 CVE-2020-29660 CVE-2020-29569
CVE-2020-29568 CVE-2020-29374 CVE-2020-29371
CVE-2020-29369 CVE-2020-29368 CVE-2020-28974
CVE-2020-28941 CVE-2020-28915 CVE-2020-28588
CVE-2020-28374 CVE-2020-27835 CVE-2020-27830
CVE-2020-27815 CVE-2020-27777 CVE-2020-27675
CVE-2020-27673 CVE-2020-27152 CVE-2020-25704
CVE-2020-25669 CVE-2020-25668 CVE-2020-25656
CVE-2020-25643 CVE-2020-25641 CVE-2020-25284
CVE-2020-25212 CVE-2020-24490 CVE-2020-15437
CVE-2020-15436 CVE-2020-14314 CVE-2020-10135
Reference: ESB-2021.0648
ESB-2021.0565
ESB-2021.0556
ESB-2021.0166
ESB-2020.4505
ESB-2020.4432
ESB-2020.4417
Original Bulletin:
https://ubuntu.com/security/notices/USN-4749-1
https://ubuntu.com/security/notices/USN-4753-1
https://ubuntu.com/security/notices/USN-4752-1
https://ubuntu.com/security/notices/USN-4751-1
https://ubuntu.com/security/notices/USN-4750-1
https://ubuntu.com/security/notices/USN-4748-1
Comment: This bulletin contains six (6) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4749-1: Linux kernel vulnerabilities
25 February 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
o linux-dell300x - Linux kernel for Dell 300x platforms
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
o linux-hwe - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
Bodong Zhao discovered a use-after-free in the Sun keyboard driver
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service or possibly execute arbitrary code.
( CVE-2020-25669 )
It was discovered that the jfs file system implementation in the Linux
kernel contained an out-of-bounds read vulnerability. A local attacker
could use this to possibly cause a denial of service (system crash).
( CVE-2020-27815 )
Shisong Qin and Bodong Zhao discovered that Speakup screen reader driver in
the Linux kernel did not correctly handle setting line discipline in some
situations. A local attacker could use this to cause a denial of service
(system crash). ( CVE-2020-27830 , CVE-2020-28941 )
It was discovered that the memory management subsystem in the Linux kernel
did not properly handle copy-on-write operations in some situations. A
local attacker could possibly use this to gain unintended write access to
read-only memory pages. ( CVE-2020-29374 )
Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event
processing backend in the Linux kernel did not properly limit the number of
events queued. An attacker in a guest VM could use this to cause a denial
of service in the host OS. ( CVE-2020-29568 )
Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the
Xen paravirt block backend in the Linux kernel, leading to a use-after-free
vulnerability. An attacker in a guest VM could use this to cause a denial
of service in the host OS. ( CVE-2020-29569 )
Jann Horn discovered that the tty subsystem of the Linux kernel did not use
consistent locking in some situations, leading to a read-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly expose sensitive information (kernel memory).
( CVE-2020-29660 )
Jann Horn discovered a race condition in the tty subsystem of the Linux
kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-
free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2020-29661 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-4.15.0-1012-dell300x - 4.15.0-1012.16
o linux-image-4.15.0-1065-oracle - 4.15.0-1065.73
o linux-image-4.15.0-1079-gke - 4.15.0-1079.84
o linux-image-4.15.0-1079-raspi2 - 4.15.0-1079.84
o linux-image-4.15.0-1085-kvm - 4.15.0-1085.87
o linux-image-4.15.0-1093-gcp - 4.15.0-1093.106
o linux-image-4.15.0-1094-aws - 4.15.0-1094.101
o linux-image-4.15.0-1096-snapdragon - 4.15.0-1096.105
o linux-image-4.15.0-1108-azure - 4.15.0-1108.120
o linux-image-4.15.0-136-generic - 4.15.0-136.140
o linux-image-4.15.0-136-generic-lpae - 4.15.0-136.140
o linux-image-4.15.0-136-lowlatency - 4.15.0-136.140
o linux-image-aws-lts-18.04 - 4.15.0.1094.97
o linux-image-azure-lts-18.04 - 4.15.0.1108.81
o linux-image-dell300x - 4.15.0.1012.14
o linux-image-gcp-lts-18.04 - 4.15.0.1093.111
o linux-image-generic - 4.15.0.136.123
o linux-image-generic-lpae - 4.15.0.136.123
o linux-image-gke - 4.15.0.1079.83
o linux-image-gke-4.15 - 4.15.0.1079.83
o linux-image-kvm - 4.15.0.1085.81
o linux-image-lowlatency - 4.15.0.136.123
o linux-image-oracle-lts-18.04 - 4.15.0.1065.75
o linux-image-powerpc-e500mc - 4.15.0.136.123
o linux-image-powerpc-smp - 4.15.0.136.123
o linux-image-powerpc64-emb - 4.15.0.136.123
o linux-image-powerpc64-smp - 4.15.0.136.123
o linux-image-raspi2 - 4.15.0.1079.76
o linux-image-snapdragon - 4.15.0.1096.99
o linux-image-virtual - 4.15.0.136.123
Ubuntu 16.04
o linux-image-4.15.0-1065-oracle - 4.15.0-1065.73~16.04.1
o linux-image-4.15.0-1093-gcp - 4.15.0-1093.106~16.04.1
o linux-image-4.15.0-1094-aws - 4.15.0-1094.101~16.04.1
o linux-image-4.15.0-1108-azure - 4.15.0-1108.120~16.04.1
o linux-image-4.15.0-136-generic - 4.15.0-136.140~16.04.1
o linux-image-4.15.0-136-generic-lpae - 4.15.0-136.140~16.04.1
o linux-image-4.15.0-136-lowlatency - 4.15.0-136.140~16.04.1
o linux-image-aws-hwe - 4.15.0.1094.87
o linux-image-azure - 4.15.0.1108.99
o linux-image-gcp - 4.15.0.1093.94
o linux-image-generic-hwe-16.04 - 4.15.0.136.132
o linux-image-generic-lpae-hwe-16.04 - 4.15.0.136.132
o linux-image-gke - 4.15.0.1093.94
o linux-image-lowlatency-hwe-16.04 - 4.15.0.136.132
o linux-image-oem - 4.15.0.136.132
o linux-image-oracle - 4.15.0.1065.53
o linux-image-virtual-hwe-16.04 - 4.15.0.136.132
Ubuntu 14.04
o linux-image-4.15.0-1108-azure - 4.15.0-1108.120~14.04.1
o linux-image-azure - 4.15.0.1108.81
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2020-27815
o CVE-2020-29660
o CVE-2020-27830
o CVE-2020-29568
o CVE-2020-29374
o CVE-2020-29569
o CVE-2020-29661
o CVE-2020-25669
o CVE-2020-28941
Related notices
o USN-4751-1 : linux-image-5.8.0-1023-azure, linux-image-5.8.0-1019-kvm,
linux-raspi, linux-image-generic-lpae-hwe-20.04, linux-image-oem-20.04,
linux-image-generic-64k-hwe-20.04, linux-image-generic-hwe-20.04,
linux-image-5.8.0-44-generic-lpae, linux-image-5.8.0-1016-raspi-nolpae,
linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-44-generic,
linux-image-gcp, linux-image-lowlatency, linux-image-5.8.0-1021-oracle,
linux-image-5.8.0-44-lowlatency, linux-image-generic, linux,
linux-image-5.8.0-1024-aws, linux-image-5.8.0-1016-raspi,
linux-image-5.8.0-44-generic-64k, linux-image-generic-64k, linux-oracle,
linux-hwe-5.8, linux-image-raspi-nolpae, linux-azure, linux-image-aws,
linux-image-raspi, linux-image-virtual, linux-gcp,
linux-image-5.8.0-1023-gcp, linux-image-oracle, linux-image-azure,
linux-image-kvm, linux-image-virtual-hwe-20.04, linux-image-gke, linux-kvm,
linux-aws, linux-image-generic-lpae
o USN-4752-1 : linux-oem-5.6, linux-image-5.6.0-1048-oem,
linux-image-oem-20.04
o USN-4750-1 : linux-image-gkeop, linux-image-5.4.0-1033-kvm,
linux-image-gkeop-5.4, linux-raspi-5.4, linux-raspi, linux-image-oem,
linux-oracle-5.4, linux-image-oem-osp1, linux-image-5.4.0-1038-oracle,
linux-image-5.4.0-1040-azure, linux-image-5.4.0-1038-aws,
linux-image-5.4.0-66-lowlatency, linux-image-virtual-hwe-18.04,
linux-image-gcp, linux-image-5.4.0-66-generic-lpae, linux-image-lowlatency,
linux-image-5.4.0-66-generic, linux-gcp-5.4, linux-image-generic-lpae,
linux-image-lowlatency-hwe-18.04, linux-image-generic, linux,
linux-image-snapdragon-hwe-18.04, linux-image-raspi-hwe-18.04,
linux-oracle, linux-aws-5.4, linux-image-5.4.0-1010-gkeop, linux-azure,
linux-image-aws, linux-image-raspi, linux-gke-5.4, linux-gcp, linux-gkeop,
linux-gkeop-5.4, linux-image-raspi2, linux-image-virtual,
linux-image-5.4.0-1037-gcp, linux-azure-5.4, linux-hwe-5.4,
linux-image-oracle, linux-image-azure, linux-image-kvm,
linux-image-generic-lpae-hwe-18.04, linux-kvm,
linux-image-generic-hwe-18.04, linux-image-gke-5.4, linux-aws,
linux-image-5.4.0-1036-gke, linux-image-5.4.0-1029-raspi
o USN-4709-1 : linux-snapdragon, linux-image-4.4.0-1085-aws, linux-image-kvm,
linux-image-aws, linux-image-4.4.0-1121-aws, linux-image-4.4.0-1145-raspi2,
linux-image-4.4.0-1149-snapdragon, linux-image-raspi2, linux-kvm,
linux-image-snapdragon, linux-raspi2, linux-image-4.4.0-1087-kvm, linux-aws
o USN-4708-1 : linux-image-powerpc-e500mc-lts-xenial,
linux-image-powerpc-e500mc, linux-image-4.4.0-201-powerpc64-emb,
linux-image-virtual-lts-xenial, linux-image-powerpc64-emb-lts-xenial,
linux-image-4.4.0-201-powerpc-e500mc, linux-image-4.4.0-201-powerpc-smp,
linux-image-powerpc-smp, linux-image-powerpc64-smp,
linux-image-4.4.0-201-powerpc64-smp, linux-image-generic-lts-xenial,
linux-image-lowlatency-lts-xenial, linux-image-generic, linux,
linux-image-4.4.0-201-generic, linux-image-4.4.0-201-lowlatency,
linux-image-generic-lpae-lts-xenial, linux-image-powerpc-smp-lts-xenial,
linux-image-virtual, linux-image-powerpc64-smp-lts-xenial,
linux-image-4.4.0-201-generic-lpae, linux-lts-xenial,
linux-image-lowlatency, linux-image-powerpc64-emb, linux-image-generic-lpae
o USN-4748-1 : linux-image-powerpc-e500mc-lts-xenial,
linux-image-powerpc-e500mc, linux-image-virtual-lts-xenial,
linux-image-4.4.0-203-lowlatency, linux-image-powerpc64-emb-lts-xenial,
linux-image-powerpc-smp, linux-image-4.4.0-203-generic-lpae,
linux-image-4.4.0-203-generic, linux-image-powerpc64-smp,
linux-image-generic-lts-xenial, linux-image-4.4.0-203-powerpc64-smp,
linux-image-lowlatency, linux-image-4.4.0-203-powerpc-smp,
linux-image-snapdragon, linux-image-lowlatency-lts-xenial,
linux-image-generic, linux, linux-image-4.4.0-203-powerpc-e500mc,
linux-image-4.4.0-1150-snapdragon, linux-image-aws,
linux-image-4.4.0-1146-raspi2, linux-image-generic-lpae-lts-xenial,
linux-image-powerpc-smp-lts-xenial, linux-image-virtual,
linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1122-aws,
linux-image-raspi2, linux-raspi2, linux-snapdragon,
linux-image-4.4.0-203-powerpc64-emb, linux-lts-xenial, linux-image-kvm,
linux-image-4.4.0-1086-aws, linux-image-4.4.0-1088-kvm, linux-kvm,
linux-aws, linux-image-powerpc64-emb, linux-image-generic-lpae
- --------------------------------------------------------------------------------
USN-4753-1: Linux kernel (OEM) vulnerability
25 February 2021
The system could allow unintended access to data in some environments.
Releases
o Ubuntu 20.04 LTS
Packages
o linux-oem-5.10 - Linux kernel for OEM systems
Details
It was discovered that the LIO SCSI target implementation in the Linux
kernel performed insufficient identifier checking in certain XCOPY
requests. An attacker with access to at least one LUN in a multiple
backstore environment could use this to expose sensitive information or
modify data. ( CVE-2020-28374 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-5.10.0-1014-oem - 5.10.0-1014.15
o linux-image-oem-20.04b - 5.10.0.1014.15
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2021-3178
o CVE-2020-28374
Related notices
o USN-4709-1 : linux-image-4.4.0-1145-raspi2, linux-image-4.4.0-1087-kvm,
linux-image-4.4.0-1149-snapdragon, linux-raspi2, linux-image-raspi2,
linux-image-aws, linux-image-kvm, linux-image-snapdragon, linux-snapdragon,
linux-image-4.4.0-1085-aws, linux-kvm, linux-aws,
linux-image-4.4.0-1121-aws
o USN-4713-1 : linux-gcp, linux-image-5.4.0-1032-kvm, linux-image-gkeop-5.4,
linux-image-aws, linux-image-azure, linux-image-5.8.0-1018-oracle,
linux-aws, linux-image-5.4.0-1036-gcp, linux-image-5.4.0-1039-azure,
linux-image-gcp, linux-image-5.4.0-1037-oracle, linux-image-gke,
linux-raspi, linux-image-5.8.0-1021-aws, linux-image-raspi2,
linux-image-kvm, linux-image-5.8.0-1020-azure, linux-oracle,
linux-oracle-5.4, linux-image-5.8.0-1013-raspi,
linux-image-5.8.0-1013-raspi-nolpae, linux-image-5.4.0-1037-aws,
linux-image-gke-5.4, linux-image-raspi, linux-gcp-5.4, linux-gkeop-5.4,
linux-azure-5.4, linux-kvm, linux-image-5.4.0-1035-gke,
linux-image-5.8.0-1020-gcp, linux-image-oracle, linux-azure,
linux-image-5.4.0-1009-gkeop, linux-aws-5.4, linux-image-raspi-hwe-18.04,
linux-gke-5.4, linux-image-5.4.0-1028-raspi, linux-image-raspi-nolpae,
linux-image-5.8.0-1016-kvm, linux-raspi-5.4
o USN-4713-2 : linux-image-3.13.0-184-lowlatency, linux-image-powerpc64-smp,
linux-image-3.13.0-184-generic-lpae, linux-image-powerpc-e500mc,
linux-image-powerpc64-emb, linux-image-3.13.0-184-powerpc64-smp,
linux-image-lowlatency-pae, linux-image-5.3.0-1040-gke,
linux-image-3.13.0-184-powerpc-e500mc, linux-hwe, linux, linux-gke-5.3,
linux-image-5.0.0-1051-gke, linux-gke-5.0, linux-image-raspi2-hwe-18.04,
linux-raspi2-5.3, linux-image-virtual, linux-image-server,
linux-image-5.3.0-70-lowlatency, linux-image-powerpc-e500,
linux-image-generic-pae, linux-image-lowlatency, linux-image-gke-5.0,
linux-image-powerpc-smp, linux-image-5.3.0-70-generic,
linux-image-highbank, linux-image-3.13.0-184-powerpc-smp,
linux-image-generic, linux-image-generic-lpae,
linux-image-3.13.0-184-powerpc64-emb, linux-image-gke-5.3,
linux-image-gkeop-5.3, linux-image-omap,
linux-image-3.13.0-184-powerpc-e500, linux-image-5.3.0-1037-raspi2,
linux-image-3.13.0-184-generic
o USN-4694-1 : linux-image-powerpc-e500mc-lts-xenial,
linux-image-powerpc64-smp, linux-hwe-5.4, linux-image-lowlatency-hwe-18.04,
linux-image-oem-osp1, linux-image-powerpc-e500mc,
linux-image-5.8.0-38-lowlatency, linux-image-powerpc64-emb,
linux-image-4.4.0-200-powerpc64-smp, linux-image-virtual-hwe-16.04,
linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-20.04,
linux-image-lowlatency-lts-xenial, linux-image-5.8.0-38-generic,
linux-image-generic-lpae-hwe-20.04, linux-image-4.15.0-132-generic-lpae,
linux-hwe, linux-image-generic-lpae-hwe-16.04,
linux-image-lowlatency-hwe-16.04, linux, linux-image-oem,
linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-xenial,
linux-image-generic-hwe-16.04, linux-image-virtual,
linux-image-4.4.0-200-generic, linux-image-4.4.0-200-generic-lpae,
linux-image-generic-hwe-18.04, linux-image-4.4.0-200-powerpc-e500mc,
linux-image-powerpc-smp, linux-image-5.8.0-38-generic-lpae,
linux-image-virtual-hwe-20.04, linux-lts-xenial,
linux-image-virtual-hwe-18.04, linux-image-4.15.0-132-generic,
linux-image-4.4.0-200-powerpc64-emb, linux-image-lowlatency-hwe-20.04,
linux-image-powerpc64-smp-lts-xenial, linux-image-5.4.0-62-lowlatency,
linux-image-4.4.0-200-lowlatency, linux-image-4.15.0-132-lowlatency,
linux-image-5.4.0-62-generic-lpae, linux-image-generic-64k,
linux-image-powerpc-smp-lts-xenial, linux-image-5.8.0-38-generic-64k,
linux-image-generic, linux-image-generic-lpae, linux-hwe-5.8,
linux-image-generic-lpae-hwe-18.04, linux-image-virtual-lts-xenial,
linux-image-5.4.0-62-generic, linux-image-powerpc64-emb-lts-xenial,
linux-image-lowlatency, linux-image-4.4.0-200-powerpc-smp
o USN-4711-1 : linux-gcp, linux-gcp-4.15, linux-image-aws-hwe,
linux-image-azure, linux-image-4.15.0-1092-gcp, linux-aws,
linux-image-4.15.0-1084-kvm, linux-image-gcp, linux-image-gke,
linux-image-raspi2, linux-image-kvm, linux-snapdragon,
linux-image-4.15.0-1095-snapdragon, linux-oracle, linux-aws-hwe,
linux-image-4.15.0-1078-raspi2, linux-gke-4.15, linux-raspi2,
linux-image-4.15.0-1078-gke, linux-image-aws-lts-18.04, linux-azure-4.15,
linux-kvm, linux-image-gke-4.15, linux-image-4.15.0-1106-azure,
linux-image-4.15.0-1093-aws, linux-image-oracle-lts-18.04,
linux-image-azure-lts-18.04, linux-image-oracle, linux-image-gcp-lts-18.04,
linux-azure, linux-image-4.15.0-1064-oracle, linux-image-snapdragon
- --------------------------------------------------------------------------------
USN-4752-1: Linux kernel (OEM) vulnerabilities
25 February 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.04 LTS
Packages
o linux-oem-5.6 - Linux kernel for OEM systems
Details
Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered
that legacy pairing and secure-connections pairing authentication in the
Bluetooth protocol could allow an unauthenticated user to complete
authentication without pairing credentials via adjacent access. A
physically proximate attacker could use this to impersonate a previously
paired Bluetooth device. ( CVE-2020-10135 )
Jay Shin discovered that the ext4 file system implementation in the Linux
kernel did not properly handle directory access with broken indexing,
leading to an out-of-bounds read vulnerability. A local attacker could use
this to cause a denial of service (system crash). ( CVE-2020-14314 )
It was discovered that the block layer implementation in the Linux kernel
did not properly perform reference counting in some situations, leading to
a use-after-free vulnerability. A local attacker could use this to cause a
denial of service (system crash). ( CVE-2020-15436 )
It was discovered that the serial port driver in the Linux kernel did not
properly initialize a pointer in some situations. A local attacker could
possibly use this to cause a denial of service (system crash).
( CVE-2020-15437 )
Andy Nguyen discovered that the Bluetooth HCI event packet parser in the
Linux kernel did not properly handle event advertisements of certain sizes,
leading to a heap-based buffer overflow. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. ( CVE-2020-24490 )
It was discovered that the NFS client implementation in the Linux kernel
did not properly perform bounds checking before copying security labels in
some situations. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2020-25212 )
It was discovered that the Rados block device (rbd) driver in the Linux
kernel did not properly perform privilege checks for access to rbd devices
in some situations. A local attacker could use this to map or unmap rbd
block devices. ( CVE-2020-25284 )
It was discovered that the block layer subsystem in the Linux kernel did
not properly handle zero-length requests. A local attacker could use this
to cause a denial of service. ( CVE-2020-25641 )
It was discovered that the HDLC PPP implementation in the Linux kernel did
not properly validate input in some situations. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. ( CVE-2020-25643 )
Kiyin () discovered that the perf subsystem in the Linux kernel did
not properly deallocate memory in some situations. A privileged attacker
could use this to cause a denial of service (kernel memory exhaustion).
( CVE-2020-25704 )
It was discovered that the KVM hypervisor in the Linux kernel did not
properly handle interrupts in certain situations. A local attacker in a
guest VM could possibly use this to cause a denial of service (host system
crash). ( CVE-2020-27152 )
It was discovered that the jfs file system implementation in the Linux
kernel contained an out-of-bounds read vulnerability. A local attacker
could use this to possibly cause a denial of service (system crash).
( CVE-2020-27815 )
It was discovered that an information leak existed in the syscall
implementation in the Linux kernel on 32 bit systems. A local attacker
could use this to expose sensitive information (kernel memory).
( CVE-2020-28588 )
It was discovered that the framebuffer implementation in the Linux kernel
did not properly perform range checks in certain situations. A local
attacker could use this to expose sensitive information (kernel memory).
( CVE-2020-28915 )
Jann Horn discovered a race condition in the copy-on-write implementation
in the Linux kernel when handling hugepages. A local attacker could use
this to gain unintended write access to read-only memory pages.
( CVE-2020-29368 )
Jann Horn discovered that the mmap implementation in the Linux kernel
contained a race condition when handling munmap() operations, leading to a
read-after-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possibly expose sensitive information.
( CVE-2020-29369 )
Jann Horn discovered that the romfs file system in the Linux kernel did not
properly validate file system meta-data, leading to an out-of-bounds read.
An attacker could use this to construct a malicious romfs image that, when
mounted, exposed sensitive information (kernel memory). ( CVE-2020-29371 )
Jann Horn discovered that the tty subsystem of the Linux kernel did not use
consistent locking in some situations, leading to a read-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly expose sensitive information (kernel memory).
( CVE-2020-29660 )
Jann Horn discovered a race condition in the tty subsystem of the Linux
kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-
free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2020-29661 )
It was discovered that a race condition existed that caused the Linux
kernel to not properly restrict exit signal delivery. A local attacker
could possibly use this to send signals to arbitrary processes.
( CVE-2020-35508 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-5.6.0-1048-oem - 5.6.0-1048.52
o linux-image-oem-20.04 - 5.6.0.1048.44
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2020-27152
o CVE-2020-28915
o CVE-2020-24490
o CVE-2020-25643
o CVE-2020-29661
o CVE-2020-25641
o CVE-2020-28588
o CVE-2020-29368
o CVE-2020-25212
o CVE-2020-25284
o CVE-2020-27815
o CVE-2020-29371
o CVE-2020-15436
o CVE-2020-25704
o CVE-2020-29369
o CVE-2020-10135
o CVE-2020-35508
o CVE-2020-14314
o CVE-2020-29660
o CVE-2020-15437
Related notices
o USN-4579-1 : linux-image-raspi2, linux-image-4.4.0-1141-raspi2,
linux-image-powerpc64-smp, linux-image-virtual-lts-xenial,
linux-image-generic-lts-xenial, linux, linux-image-lowlatency-lts-xenial,
linux-raspi2, linux-image-powerpc64-emb, linux-image-aws,
linux-image-4.4.0-1081-aws, linux-image-4.4.0-193-generic,
linux-image-powerpc-e500mc, linux-image-4.4.0-1082-kvm,
linux-image-4.4.0-193-powerpc64-emb, linux-snapdragon, linux-aws,
linux-image-4.4.0-193-generic-lpae, linux-image-kvm,
linux-image-snapdragon, linux-kvm, linux-image-generic,
linux-image-4.4.0-1117-aws, linux-image-virtual,
linux-image-4.4.0-193-powerpc-e500mc, linux-image-generic-lpae-lts-xenial,
linux-image-4.4.0-1145-snapdragon, linux-image-4.4.0-193-powerpc64-smp,
linux-image-lowlatency, linux-image-powerpc-smp, linux-lts-xenial,
linux-image-4.4.0-193-powerpc-smp, linux-image-generic-lpae,
linux-image-4.4.0-193-lowlatency
o USN-4578-1 : linux-image-raspi2, linux-gcp, linux-gke-4.15, linux-aws-hwe,
linux-image-4.15.0-121-generic-lpae, linux-image-gke-4.15,
linux-image-generic-lpae-hwe-16.04, linux-image-powerpc64-smp,
linux-image-aws-hwe, linux-image-4.15.0-1099-azure,
linux-image-4.15.0-1077-kvm, linux, linux-image-4.15.0-120-lowlatency,
linux-azure-4.15, linux-azure, linux-raspi2, linux-image-gcp,
linux-image-generic-lpae, linux-image-generic-hwe-16.04,
linux-image-4.15.0-1072-gke, linux-image-powerpc64-emb,
linux-image-4.15.0-1086-aws, linux-image-azure-lts-18.04,
linux-image-powerpc-e500mc, linux-image-4.15.0-121-generic,
linux-image-4.15.0-1089-snapdragon, linux-image-4.15.0-1073-raspi2,
linux-snapdragon, linux-aws, linux-image-kvm, linux-image-oracle,
linux-image-snapdragon, linux-image-lowlatency-hwe-16.04, linux-kvm,
linux-image-generic, linux-gcp-4.15, linux-image-virtual,
linux-image-azure, linux-image-4.15.0-1057-oracle, linux-oem,
linux-image-gcp-lts-18.04, linux-image-4.15.0-1056-oracle, linux-image-gke,
linux-image-4.15.0-1098-azure, linux-image-lowlatency,
linux-image-powerpc-smp, linux-image-4.15.0-120-generic, linux-oracle,
linux-image-virtual-hwe-16.04, linux-image-oracle-lts-18.04,
linux-image-4.15.0-1099-oem, linux-image-oem,
linux-image-4.15.0-121-lowlatency, linux-hwe, linux-image-aws-lts-18.04,
linux-image-4.15.0-120-generic-lpae, linux-image-4.15.0-1086-gcp,
linux-image-4.15.0-1085-aws
o USN-4657-1 : linux-image-powerpc64-emb-lts-xenial,
linux-image-powerpc-smp-lts-xenial, linux-image-raspi2,
linux-image-powerpc64-smp, linux-image-virtual-lts-xenial,
linux-image-4.4.0-197-powerpc-e500mc, linux-image-generic-lts-xenial,
linux, linux-image-4.4.0-197-generic, linux-image-lowlatency-lts-xenial,
linux-image-powerpc64-smp-lts-xenial, linux-raspi2,
linux-image-4.4.0-197-generic-lpae, linux-image-powerpc64-emb,
linux-image-aws, linux-image-powerpc-e500mc, linux-image-4.4.0-1082-aws,
linux-snapdragon, linux-aws, linux-image-kvm,
linux-image-4.4.0-1146-snapdragon, linux-image-snapdragon,
linux-image-4.4.0-1084-kvm, linux-kvm, linux-image-4.4.0-197-powerpc-smp,
linux-image-generic, linux-image-4.4.0-1118-aws, linux-image-virtual,
linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-197-powerpc64-smp,
linux-image-lowlatency, linux-image-powerpc-smp,
linux-image-4.4.0-197-lowlatency, linux-lts-xenial,
linux-image-generic-lpae, linux-image-4.4.0-197-powerpc64-emb,
linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-1142-raspi2
o USN-4525-1 : linux-image-raspi2, linux-gcp, linux-image-5.4.0-1026-azure,
linux-image-raspi-hwe-18.04, linux-image-virtual-hwe-18.04,
linux-oracle-5.4, linux, linux-image-5.4.0-48-lowlatency, linux-azure,
linux-image-gcp, linux-raspi, linux-hwe-5.4, linux-image-5.4.0-48-generic,
linux-image-aws, linux-gcp-5.4, linux-image-5.4.0-1024-kvm,
linux-image-5.4.0-48-generic-lpae, linux-raspi-5.4, linux-aws,
linux-image-kvm, linux-image-oracle, linux-kvm,
linux-image-generic-hwe-18.04, linux-image-5.4.0-1025-aws,
linux-image-generic, linux-image-lowlatency-hwe-18.04, linux-image-virtual,
linux-image-generic-lpae-hwe-18.04, linux-image-azure,
linux-image-5.4.0-1025-gcp, linux-image-raspi, linux-image-gke,
linux-image-lowlatency, linux-azure-5.4, linux-image-5.4.0-1019-raspi,
linux-image-oem, linux-image-snapdragon-hwe-18.04, linux-image-oem-osp1,
linux-image-generic-lpae, linux-aws-5.4, linux-oracle,
linux-image-5.4.0-1025-oracle
o USN-4680-1 : linux-image-raspi2, linux-gcp, linux-gke-4.15, linux-aws-hwe,
linux-image-gke-4.15, linux-image-generic-lpae-hwe-16.04,
linux-image-powerpc64-smp, linux-image-4.15.0-1094-snapdragon,
linux-image-aws-hwe, linux-image-4.15.0-1091-gcp, linux, linux-azure-4.15,
linux-azure, linux-raspi2, linux-image-gcp, linux-image-4.15.0-1091-aws,
linux-image-generic-hwe-16.04, linux-image-powerpc64-emb,
linux-image-azure-lts-18.04, linux-image-powerpc-e500mc,
linux-image-4.15.0-1082-kvm, linux-image-4.15.0-129-generic-lpae,
linux-snapdragon, linux-aws, linux-image-kvm,
linux-image-4.15.0-1103-azure, linux-image-oracle, linux-image-snapdragon,
linux-image-lowlatency-hwe-16.04, linux-kvm,
linux-image-4.15.0-129-generic, linux-image-generic, linux-gcp-4.15,
linux-image-virtual, linux-image-4.15.0-129-lowlatency,
linux-image-4.15.0-1077-gke, linux-image-azure, linux-image-gcp-lts-18.04,
linux-image-gke, linux-image-lowlatency, linux-image-powerpc-smp,
linux-image-4.15.0-1077-raspi2, linux-image-oracle-lts-18.04,
linux-image-oem, linux-hwe, linux-image-4.15.0-1062-oracle,
linux-image-aws-lts-18.04, linux-image-virtual-hwe-16.04,
linux-image-generic-lpae, linux-oracle
o USN-4679-1 : linux-image-5.4.0-1026-raspi, linux-image-raspi2, linux-gcp,
linux-image-5.4.0-1034-oracle, linux-image-raspi-hwe-18.04,
linux-image-virtual-hwe-18.04, linux-oracle-5.4,
linux-image-5.4.0-1033-gcp, linux, linux-image-5.4.0-59-lowlatency,
linux-azure, linux-image-gcp, linux-raspi, linux-hwe-5.4, linux-image-aws,
linux-image-5.4.0-59-generic-lpae, linux-gcp-5.4, linux-image-gke-5.4,
linux-image-5.4.0-59-generic, linux-raspi-5.4, linux-aws, linux-image-kvm,
linux-image-oracle, linux-kvm, linux-image-generic-hwe-18.04,
linux-image-generic, linux-image-5.4.0-1035-azure,
linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1031-kvm,
linux-image-virtual, linux-gke-5.4, linux-image-generic-lpae-hwe-18.04,
linux-image-azure, linux-image-raspi, linux-image-lowlatency,
linux-azure-5.4, linux-image-5.4.0-1033-gke, linux-image-oem,
linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1034-aws,
linux-image-oem-osp1, linux-image-generic-lpae, linux-aws-5.4, linux-oracle
o USN-4659-1 : linux-gcp, linux-image-5.8.0-1013-azure, linux, linux-azure,
linux-image-gcp, linux-image-5.8.0-31-lowlatency,
linux-image-5.8.0-31-generic-64k, linux-image-raspi-nolpae,
linux-image-aws, linux-raspi, linux-image-oem-20.04,
linux-image-5.8.0-1011-kvm, linux-image-5.8.0-31-generic-lpae,
linux-image-5.8.0-1008-raspi, linux-image-5.8.0-31-generic, linux-aws,
linux-image-kvm, linux-image-oracle, linux-kvm,
linux-image-5.8.0-1011-oracle, linux-image-5.8.0-1014-aws,
linux-image-generic, linux-image-virtual, linux-image-azure,
linux-image-gke, linux-image-lowlatency, linux-image-generic-64k,
linux-image-5.8.0-1008-raspi-nolpae, linux-image-raspi,
linux-image-generic-lpae, linux-oracle, linux-image-5.8.0-1012-gcp
o USN-4592-1 : linux-image-5.3.0-1036-raspi2,
linux-image-5.0.0-1070-oem-osp1, linux-oem-osp1, linux-image-oem-osp1,
linux-raspi2-5.3, linux-image-raspi2-hwe-18.04
o USN-4576-1 : linux-image-raspi2, linux-gcp,
linux-image-5.4.0-51-lowlatency, linux-image-raspi-hwe-18.04,
linux-image-virtual-hwe-18.04, linux-oracle-5.4, linux, linux-azure,
linux-image-5.4.0-1031-azure, linux-image-gcp, linux-raspi, linux-hwe-5.4,
linux-image-aws, linux-gcp-5.4, linux-image-5.4.0-51-generic-lpae,
linux-image-virtual-hwe-20.04, linux-raspi-5.4, linux-aws, linux-image-kvm,
linux-image-oracle, linux-kvm, linux-image-generic-hwe-18.04,
linux-image-5.4.0-1028-gcp, linux-image-generic,
linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1028-oracle,
linux-image-lowlatency-hwe-20.04, linux-image-virtual,
linux-image-5.4.0-1026-kvm, linux-image-generic-lpae-hwe-18.04,
linux-image-5.4.0-1021-raspi, linux-image-azure,
linux-image-generic-hwe-20.04, linux-image-raspi, linux-image-gke,
linux-image-lowlatency, linux-azure-5.4, linux-image-5.4.0-1028-aws,
linux-image-generic-lpae-hwe-20.04, linux-image-oem,
linux-image-5.4.0-51-generic, linux-image-snapdragon-hwe-18.04,
linux-image-oem-osp1, linux-image-generic-lpae, linux-aws-5.4, linux-oracle
o USN-4710-1 : linux-image-powerpc64-smp, linux-image-4.15.0-135-lowlatency,
linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-133-lowlatency,
linux-image-4.15.0-133-generic, linux, linux-image-generic-hwe-16.04,
linux-image-powerpc64-emb, linux-image-powerpc-e500mc,
linux-image-4.15.0-133-generic-lpae, linux-image-lowlatency-hwe-16.04,
linux-image-generic, linux-image-virtual, linux-image-lowlatency,
linux-image-4.15.0-135-generic-lpae, linux-image-powerpc-smp,
linux-image-4.15.0-135-generic, linux-image-oem, linux-hwe,
linux-image-virtual-hwe-16.04, linux-image-generic-lpae
o USN-4660-1 : linux-image-raspi2, linux-gcp, linux-gke-4.15,
linux-image-4.15.0-1100-azure, linux-aws-hwe, linux-image-gke-4.15,
linux-image-generic-lpae-hwe-16.04, linux-image-powerpc64-smp,
linux-image-aws-hwe, linux-image-4.15.0-126-lowlatency,
linux-image-4.15.0-126-generic-lpae, linux, linux-azure-4.15, linux-azure,
linux-image-4.15.0-1091-snapdragon, linux-image-gcp, linux-raspi2,
linux-image-generic-hwe-16.04, linux-image-powerpc64-emb,
linux-image-4.15.0-1074-raspi2, linux-image-4.15.0-1074-gke,
linux-image-azure-lts-18.04, linux-image-powerpc-e500mc, linux-snapdragon,
linux-aws, linux-image-kvm, linux-image-oracle, linux-image-snapdragon,
linux-image-4.15.0-126-generic, linux-image-lowlatency-hwe-16.04,
linux-kvm, linux-image-4.15.0-1088-aws, linux-image-azure-edge,
linux-image-generic, linux-gcp-4.15, linux-image-virtual,
linux-image-azure, linux-oem, linux-image-4.15.0-1103-oem,
linux-image-gcp-lts-18.04, linux-image-gke, linux-image-lowlatency,
linux-image-powerpc-smp, linux-image-4.15.0-1088-gcp,
linux-image-oracle-lts-18.04, linux-image-oem, linux-hwe,
linux-image-4.15.0-1079-kvm, linux-image-aws-lts-18.04,
linux-image-virtual-hwe-16.04, linux-image-generic-lpae,
linux-image-4.15.0-1059-oracle, linux-oracle
o USN-4658-1 : linux-image-raspi2, linux-gcp, linux-image-raspi-hwe-18.04,
linux-image-5.4.0-56-lowlatency, linux-image-5.4.0-1028-kvm,
linux-image-virtual-hwe-18.04, linux-oracle-5.4, linux, linux-azure,
linux-image-gcp, linux-raspi, linux-hwe-5.4, linux-image-aws,
linux-gcp-5.4, linux-image-virtual-hwe-20.04, linux-raspi-5.4,
linux-image-5.4.0-1030-oracle, linux-aws, linux-image-kvm,
linux-image-oracle, linux-image-5.4.0-1030-aws, linux-kvm,
linux-image-generic-hwe-18.04, linux-image-generic,
linux-image-lowlatency-hwe-18.04, linux-image-lowlatency-hwe-20.04,
linux-image-virtual, linux-image-generic-lpae-hwe-18.04, linux-image-azure,
linux-image-5.4.0-56-generic, linux-image-generic-hwe-20.04,
linux-image-raspi, linux-image-gke, linux-image-lowlatency,
linux-azure-5.4, linux-image-5.4.0-1030-gcp, linux-oracle,
linux-image-5.4.0-1032-azure, linux-image-generic-lpae-hwe-20.04,
linux-image-oem, linux-image-5.4.0-56-generic-lpae,
linux-image-snapdragon-hwe-18.04, linux-image-oem-osp1,
linux-image-generic-lpae, linux-aws-5.4, linux-image-5.4.0-1023-raspi
o USN-4748-1 : linux-image-powerpc64-emb-lts-xenial,
linux-image-powerpc-smp-lts-xenial, linux-image-raspi2,
linux-image-4.4.0-1088-kvm, linux-image-4.4.0-1122-aws,
linux-image-4.4.0-203-lowlatency, linux-image-powerpc64-smp,
linux-image-virtual-lts-xenial, linux-image-4.4.0-203-generic-lpae,
linux-image-4.4.0-1086-aws, linux-image-4.4.0-1146-raspi2,
linux-image-generic-lts-xenial, linux, linux-image-lowlatency-lts-xenial,
linux-image-powerpc64-smp-lts-xenial, linux-raspi2,
linux-image-powerpc64-emb, linux-image-4.4.0-203-powerpc64-smp,
linux-image-aws, linux-image-powerpc-e500mc,
linux-image-4.4.0-203-powerpc-smp, linux-snapdragon,
linux-image-4.4.0-203-powerpc64-emb, linux-image-4.4.0-1150-snapdragon,
linux-aws, linux-image-kvm, linux-image-snapdragon, linux-kvm,
linux-image-generic, linux-image-virtual,
linux-image-generic-lpae-lts-xenial, linux-image-lowlatency,
linux-image-powerpc-smp, linux-lts-xenial,
linux-image-4.4.0-203-powerpc-e500mc, linux-image-4.4.0-203-generic,
linux-image-generic-lpae, linux-image-powerpc-e500mc-lts-xenial
o USN-4527-1 : linux-image-4.4.0-190-lowlatency,
linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial,
linux-image-raspi2, linux-image-powerpc64-smp,
linux-image-virtual-lts-xenial, linux-image-4.4.0-1080-kvm,
linux-image-4.4.0-190-powerpc-e500mc, linux-image-4.4.0-1143-snapdragon,
linux-image-4.4.0-190-powerpc64-emb, linux-image-generic-lts-xenial,
linux-image-4.4.0-1078-aws, linux, linux-image-lowlatency-lts-xenial,
linux-image-powerpc64-smp-lts-xenial, linux-raspi2,
linux-image-4.4.0-190-generic, linux-image-powerpc64-emb, linux-image-aws,
linux-image-powerpc-e500mc, linux-image-4.4.0-1114-aws, linux-snapdragon,
linux-aws, linux-image-kvm, linux-image-snapdragon, linux-kvm,
linux-image-4.4.0-190-powerpc-smp, linux-image-generic,
linux-image-4.4.0-190-powerpc64-smp, linux-image-4.4.0-190-generic-lpae,
linux-image-virtual, linux-image-generic-lpae-lts-xenial,
linux-image-lowlatency, linux-image-4.4.0-1139-raspi2,
linux-image-powerpc-smp, linux-lts-xenial, linux-image-generic-lpae,
linux-image-powerpc-e500mc-lts-xenial
o USN-4751-1 : linux-gcp, linux-image-5.8.0-1016-raspi,
linux-image-5.8.0-44-generic, linux-image-generic-64k-hwe-20.04,
linux-image-5.8.0-44-lowlatency, linux, linux-image-5.8.0-44-generic-64k,
linux-azure, linux-image-gcp, linux-image-raspi-nolpae, linux-image-aws,
linux-raspi, linux-image-oem-20.04, linux-image-virtual-hwe-20.04,
linux-aws, linux-image-5.8.0-1019-kvm, linux-image-kvm, linux-image-oracle,
linux-image-5.8.0-1023-azure, linux-image-5.8.0-1024-aws, linux-kvm,
linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-image-virtual,
linux-image-azure, linux-image-5.8.0-44-generic-lpae, linux-hwe-5.8,
linux-image-generic-hwe-20.04, linux-image-gke,
linux-image-5.8.0-1021-oracle, linux-image-lowlatency,
linux-image-generic-64k, linux-image-5.8.0-1023-gcp,
linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1016-raspi-nolpae,
linux-image-raspi, linux-image-generic-lpae, linux-oracle
o USN-4750-1 : linux-image-raspi2, linux-gcp, linux-image-raspi-hwe-18.04,
linux-gkeop-5.4, linux-image-virtual-hwe-18.04, linux-oracle-5.4,
linux-image-5.4.0-1038-oracle, linux, linux-azure, linux-image-gcp,
linux-image-5.4.0-1033-kvm, linux-image-5.4.0-1037-gcp, linux-raspi,
linux-hwe-5.4, linux-image-aws, linux-image-gke-5.4, linux-gcp-5.4,
linux-gkeop, linux-raspi-5.4, linux-image-5.4.0-1040-azure,
linux-image-5.4.0-66-generic, linux-image-5.4.0-1038-aws, linux-aws,
linux-image-kvm, linux-image-oracle, linux-image-5.4.0-66-lowlatency,
linux-kvm, linux-image-generic-hwe-18.04, linux-image-generic,
linux-image-lowlatency-hwe-18.04, linux-image-virtual,
linux-image-5.4.0-1010-gkeop, linux-gke-5.4,
linux-image-generic-lpae-hwe-18.04, linux-image-azure, linux-image-raspi,
linux-image-gkeop, linux-image-lowlatency, linux-azure-5.4,
linux-image-oem, linux-image-oem-osp1, linux-image-snapdragon-hwe-18.04,
linux-image-5.4.0-1036-gke, linux-image-5.4.0-1029-raspi,
linux-image-gkeop-5.4, linux-image-generic-lpae, linux-aws-5.4,
linux-oracle, linux-image-5.4.0-66-generic-lpae
o USN-4749-1 : linux-image-raspi2, linux-gcp, linux-gke-4.15, linux-aws-hwe,
linux-dell300x, linux-image-gke-4.15, linux-image-generic-lpae-hwe-16.04,
linux-image-powerpc64-smp, linux-image-aws-hwe,
linux-image-4.15.0-136-lowlatency, linux-image-4.15.0-1085-kvm, linux,
linux-azure-4.15, linux-image-4.15.0-1093-gcp, linux-azure,
linux-image-gcp, linux-raspi2, linux-image-4.15.0-1065-oracle,
linux-image-4.15.0-1012-dell300x, linux-image-generic-hwe-16.04,
linux-image-powerpc64-emb, linux-image-azure-lts-18.04,
linux-image-powerpc-e500mc, linux-image-4.15.0-136-generic-lpae,
linux-snapdragon, linux-aws, linux-image-kvm, linux-image-oracle,
linux-image-dell300x, linux-image-4.15.0-1108-azure,
linux-image-snapdragon, linux-image-lowlatency-hwe-16.04, linux-kvm,
linux-image-generic, linux-gcp-4.15, linux-image-4.15.0-1079-gke,
linux-image-virtual, linux-image-azure, linux-image-4.15.0-1079-raspi2,
linux-image-gcp-lts-18.04, linux-image-gke, linux-image-lowlatency,
linux-image-powerpc-smp, linux-image-4.15.0-136-generic,
linux-image-oracle-lts-18.04, linux-image-oem,
linux-image-4.15.0-1096-snapdragon, linux-hwe, linux-image-4.15.0-1094-aws,
linux-image-aws-lts-18.04, linux-image-virtual-hwe-16.04,
linux-image-generic-lpae, linux-oracle
o USN-4711-1 : linux-image-4.15.0-1093-aws, linux-gcp, linux-gke-4.15,
linux-image-raspi2, linux-aws-hwe, linux-image-gke-4.15,
linux-image-aws-hwe, linux-image-4.15.0-1106-azure, linux-azure-4.15,
linux-azure, linux-raspi2, linux-image-gcp, linux-image-azure-lts-18.04,
linux-image-4.15.0-1078-raspi2, linux-snapdragon,
linux-image-4.15.0-1095-snapdragon, linux-aws, linux-image-kvm,
linux-image-oracle, linux-image-snapdragon, linux-image-4.15.0-1092-gcp,
linux-gcp-4.15, linux-image-azure, linux-image-gcp-lts-18.04,
linux-image-gke, linux-image-oracle-lts-18.04, linux-image-4.15.0-1078-gke,
linux-image-4.15.0-1084-kvm, linux-image-aws-lts-18.04, linux-kvm,
linux-oracle, linux-image-4.15.0-1064-oracle
- --------------------------------------------------------------------------------
USN-4751-1: Linux kernel vulnerabilities
25 February 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-hwe-5.8 - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-raspi - Linux kernel for Raspberry Pi (V8) systems
Details
It was discovered that the console keyboard driver in the Linux kernel
contained a race condition. A local attacker could use this to expose
sensitive information (kernel memory). ( CVE-2020-25656 )
Minh Yuan discovered that the tty driver in the Linux kernel contained race
conditions when handling fonts. A local attacker could possibly use this to
expose sensitive information (kernel memory). ( CVE-2020-25668 )
Bodong Zhao discovered a use-after-free in the Sun keyboard driver
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service or possibly execute arbitrary code.
( CVE-2020-25669 )
Kiyin () discovered that the perf subsystem in the Linux kernel did
not properly deallocate memory in some situations. A privileged attacker
could use this to cause a denial of service (kernel memory exhaustion).
( CVE-2020-25704 )
Julien Grall discovered that the Xen dom0 event handler in the Linux kernel
did not properly limit the number of events queued. An attacker in a guest
VM could use this to cause a denial of service in the host OS.
( CVE-2020-27673 )
Jinoh Kang discovered that the Xen event channel infrastructure in the
Linux kernel contained a race condition. An attacker in guest could
possibly use this to cause a denial of service (dom0 crash).
( CVE-2020-27675 )
Daniel Axtens discovered that PowerPC RTAS implementation in the Linux
kernel did not properly restrict memory accesses in some situations. A
privileged local attacker could use this to arbitrarily modify kernel
memory, potentially bypassing kernel lockdown restrictions.
( CVE-2020-27777 )
It was discovered that the jfs file system implementation in the Linux
kernel contained an out-of-bounds read vulnerability. A local attacker
could use this to possibly cause a denial of service (system crash).
( CVE-2020-27815 )
Shisong Qin and Bodong Zhao discovered that Speakup screen reader driver in
the Linux kernel did not correctly handle setting line discipline in some
situations. A local attacker could use this to cause a denial of service
(system crash). ( CVE-2020-27830 , CVE-2020-28941 )
It was discovered that a use-after-free vulnerability existed in the
infiniband hfi1 device driver in the Linux kernel. A local attacker could
possibly use this to cause a denial of service (system crash).
( CVE-2020-27835 )
It was discovered that an information leak existed in the syscall
implementation in the Linux kernel on 32 bit systems. A local attacker
could use this to expose sensitive information (kernel memory).
( CVE-2020-28588 )
Minh Yuan discovered that the framebuffer console driver in the Linux
kernel did not properly handle fonts in some conditions. A local attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information (kernel memory). ( CVE-2020-28974 )
Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event
processing backend in the Linux kernel did not properly limit the number of
events queued. An attacker in a guest VM could use this to cause a denial
of service in the host OS. ( CVE-2020-29568 )
Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the
Xen paravirt block backend in the Linux kernel, leading to a use-after-free
vulnerability. An attacker in a guest VM could use this to cause a denial
of service in the host OS. ( CVE-2020-29569 )
Jann Horn discovered that the tty subsystem of the Linux kernel did not use
consistent locking in some situations, leading to a read-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly expose sensitive information (kernel memory).
( CVE-2020-29660 )
Jann Horn discovered a race condition in the tty subsystem of the Linux
kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-
free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2020-29661 )
It was discovered that a race condition existed that caused the Linux
kernel to not properly restrict exit signal delivery. A local attacker
could possibly use this to send signals to arbitrary processes.
( CVE-2020-35508 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o linux-image-5.8.0-1016-raspi - 5.8.0-1016.19
o linux-image-5.8.0-1016-raspi-nolpae - 5.8.0-1016.19
o linux-image-5.8.0-1019-kvm - 5.8.0-1019.21
o linux-image-5.8.0-1021-oracle - 5.8.0-1021.22
o linux-image-5.8.0-1023-azure - 5.8.0-1023.25
o linux-image-5.8.0-1023-gcp - 5.8.0-1023.24
o linux-image-5.8.0-1024-aws - 5.8.0-1024.26
o linux-image-5.8.0-44-generic - 5.8.0-44.50
o linux-image-5.8.0-44-generic-64k - 5.8.0-44.50
o linux-image-5.8.0-44-generic-lpae - 5.8.0-44.50
o linux-image-5.8.0-44-lowlatency - 5.8.0-44.50
o linux-image-aws - 5.8.0.1024.26
o linux-image-azure - 5.8.0.1023.23
o linux-image-gcp - 5.8.0.1023.23
o linux-image-generic - 5.8.0.44.49
o linux-image-generic-64k - 5.8.0.44.49
o linux-image-generic-lpae - 5.8.0.44.49
o linux-image-gke - 5.8.0.1023.23
o linux-image-kvm - 5.8.0.1019.21
o linux-image-lowlatency - 5.8.0.44.49
o linux-image-oem-20.04 - 5.8.0.44.49
o linux-image-oracle - 5.8.0.1021.20
o linux-image-raspi - 5.8.0.1016.19
o linux-image-raspi-nolpae - 5.8.0.1016.19
o linux-image-virtual - 5.8.0.44.49
Ubuntu 20.04
o linux-image-5.8.0-44-generic - 5.8.0-44.50~20.04.1
o linux-image-5.8.0-44-generic-lpae - 5.8.0-44.50~20.04.1
o linux-image-5.8.0-44-lowlatency - 5.8.0-44.50~20.04.1
o linux-image-generic-64k-hwe-20.04 - 5.8.0.44.50~20.04.30
o linux-image-generic-hwe-20.04 - 5.8.0.44.50~20.04.30
o linux-image-generic-lpae-hwe-20.04 - 5.8.0.44.50~20.04.30
o linux-image-lowlatency-hwe-20.04 - 5.8.0.44.50~20.04.30
o linux-image-virtual-hwe-20.04 - 5.8.0.44.50~20.04.30
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2020-25704
o CVE-2020-28588
o CVE-2020-29660
o CVE-2020-25656
o CVE-2020-35508
o CVE-2020-27675
o CVE-2020-27835
o CVE-2020-27673
o CVE-2020-28941
o CVE-2020-29569
o CVE-2020-29661
o CVE-2020-27830
o CVE-2020-29568
o CVE-2020-28974
o CVE-2020-27815
o CVE-2020-25668
o CVE-2020-27777
o CVE-2020-25669
Related notices
o USN-4748-1 : linux-image-4.4.0-1150-snapdragon,
linux-image-4.4.0-203-powerpc-e500mc, linux-aws, linux-image-generic,
linux-raspi2, linux, linux-image-lowlatency-lts-xenial,
linux-image-generic-lpae, linux-image-4.4.0-203-generic-lpae,
linux-image-kvm, linux-image-4.4.0-203-generic,
linux-image-virtual-lts-xenial, linux-image-powerpc64-emb-lts-xenial,
linux-image-4.4.0-203-powerpc64-smp, linux-image-4.4.0-1122-aws,
linux-image-powerpc64-emb, linux-image-4.4.0-1086-aws,
linux-image-4.4.0-1088-kvm, linux-image-generic-lts-xenial,
linux-lts-xenial, linux-image-raspi2, linux-snapdragon,
linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lpae-lts-xenial,
linux-kvm, linux-image-snapdragon, linux-image-aws,
linux-image-4.4.0-203-powerpc-smp, linux-image-powerpc-e500mc-lts-xenial,
linux-image-lowlatency, linux-image-4.4.0-1146-raspi2,
linux-image-powerpc64-smp, linux-image-4.4.0-203-lowlatency,
linux-image-powerpc-e500mc, linux-image-powerpc-smp-lts-xenial,
linux-image-virtual, linux-image-4.4.0-203-powerpc64-emb,
linux-image-powerpc-smp
o USN-4681-1 : linux-image-4.4.0-198-powerpc64-smp, linux-aws,
linux-image-generic, linux-image-4.4.0-198-lowlatency, linux-raspi2, linux,
linux-image-lowlatency-lts-xenial, linux-image-generic-lpae,
linux-image-4.4.0-198-powerpc-smp, linux-image-kvm,
linux-image-virtual-lts-xenial, linux-image-4.4.0-198-powerpc-e500mc,
linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-198-generic-lpae,
linux-image-powerpc64-emb, linux-image-4.4.0-1085-kvm,
linux-image-generic-lts-xenial, linux-lts-xenial, linux-image-raspi2,
linux-snapdragon, linux-image-powerpc64-smp-lts-xenial,
linux-image-generic-lpae-lts-xenial, linux-kvm,
linux-image-4.4.0-1143-raspi2, linux-image-snapdragon, linux-image-aws,
linux-image-4.4.0-198-powerpc64-emb, linux-image-4.4.0-1119-aws,
linux-image-powerpc-e500mc-lts-xenial, linux-image-lowlatency,
linux-image-powerpc64-smp, linux-image-4.4.0-198-generic,
linux-image-powerpc-e500mc, linux-image-4.4.0-1083-aws,
linux-image-powerpc-smp-lts-xenial, linux-image-virtual,
linux-image-4.4.0-1147-snapdragon, linux-image-powerpc-smp
o USN-4680-1 : linux-gke-4.15, linux-image-oracle-lts-18.04, linux-aws,
linux-image-generic, linux-image-azure, linux-image-generic-lpae-hwe-16.04,
linux-raspi2, linux, linux-image-generic-lpae, linux-image-kvm,
linux-image-oem, linux-gcp, linux-azure-4.15, linux-image-powerpc64-emb,
linux-image-aws-hwe, linux-image-virtual-hwe-16.04,
linux-image-aws-lts-18.04, linux-hwe, linux-image-gke-4.15,
linux-image-4.15.0-1062-oracle, linux-image-oracle, linux-image-raspi2,
linux-oracle, linux-snapdragon, linux-kvm, linux-image-gke,
linux-image-generic-hwe-16.04, linux-image-4.15.0-129-generic,
linux-image-4.15.0-1082-kvm, linux-image-snapdragon, linux-azure,
linux-image-4.15.0-129-lowlatency, linux-image-4.15.0-1091-aws,
linux-image-lowlatency-hwe-16.04, linux-image-lowlatency,
linux-image-powerpc64-smp, linux-image-gcp-lts-18.04,
linux-image-powerpc-e500mc, linux-image-virtual,
linux-image-4.15.0-1077-gke, linux-image-gcp, linux-aws-hwe,
linux-gcp-4.15, linux-image-4.15.0-1077-raspi2,
linux-image-4.15.0-1094-snapdragon, linux-image-4.15.0-1091-gcp,
linux-image-4.15.0-129-generic-lpae, linux-image-azure-lts-18.04,
linux-image-powerpc-smp, linux-image-4.15.0-1103-azure
o USN-4679-1 : linux-image-gke-5.4, linux-aws, linux-image-5.4.0-1035-azure,
linux-image-5.4.0-1033-gcp, linux-image-generic, linux-image-raspi,
linux-image-azure, linux-image-raspi-hwe-18.04,
linux-image-5.4.0-1034-oracle, linux, linux-image-5.4.0-59-generic-lpae,
linux-hwe-5.4, linux-image-5.4.0-1033-gke, linux-image-generic-lpae,
linux-image-kvm, linux-image-oem, linux-gcp-5.4, linux-raspi,
linux-image-5.4.0-59-generic, linux-azure-5.4, linux-gcp,
linux-image-oem-osp1, linux-image-generic-hwe-18.04, linux-image-oracle,
linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1031-kvm,
linux-image-raspi2, linux-kvm, linux-oracle, linux-raspi-5.4, linux-azure,
linux-image-5.4.0-1034-aws, linux-image-aws, linux-aws-5.4, linux-gke-5.4,
linux-image-virtual-hwe-18.04, linux-oracle-5.4, linux-image-lowlatency,
linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-59-lowlatency,
linux-image-5.4.0-1026-raspi, linux-image-virtual, linux-image-gcp,
linux-image-generic-lpae-hwe-18.04
o USN-4752-1 : linux-oem-5.6, linux-image-oem-20.04,
linux-image-5.6.0-1048-oem
o USN-4750-1 : linux-image-gke-5.4, linux-aws, linux-image-generic,
linux-image-raspi, linux-image-5.4.0-1010-gkeop, linux-image-azure,
linux-image-5.4.0-1038-oracle, linux-image-5.4.0-66-lowlatency,
linux-image-raspi-hwe-18.04, linux, linux-image-5.4.0-1040-azure,
linux-hwe-5.4, linux-image-5.4.0-66-generic-lpae, linux-image-generic-lpae,
linux-image-kvm, linux-image-oem, linux-gcp-5.4, linux-image-gkeop-5.4,
linux-raspi, linux-azure-5.4, linux-gcp, linux-image-5.4.0-1038-aws,
linux-image-oem-osp1, linux-image-generic-hwe-18.04, linux-image-oracle,
linux-image-lowlatency-hwe-18.04, linux-image-raspi2, linux-image-gkeop,
linux-kvm, linux-oracle, linux-raspi-5.4, linux-image-5.4.0-1036-gke,
linux-image-5.4.0-1037-gcp, linux-azure, linux-image-5.4.0-1029-raspi,
linux-image-aws, linux-gkeop, linux-aws-5.4, linux-gke-5.4,
linux-image-virtual-hwe-18.04, linux-oracle-5.4, linux-image-lowlatency,
linux-image-snapdragon-hwe-18.04, linux-image-virtual, linux-image-gcp,
linux-image-5.4.0-1033-kvm, linux-image-5.4.0-66-generic, linux-gkeop-5.4,
linux-image-generic-lpae-hwe-18.04
o USN-4709-1 : linux-image-4.4.0-1085-aws, linux-aws, linux-image-raspi2,
linux-snapdragon, linux-image-4.4.0-1145-raspi2, linux-kvm,
linux-image-4.4.0-1087-kvm, linux-image-4.4.0-1149-snapdragon,
linux-image-snapdragon, linux-image-aws, linux-raspi2,
linux-image-4.4.0-1121-aws, linux-image-kvm
o USN-4683-1 : linux-image-5.6.0-1039-oem, linux-image-oem-20.04,
linux-oem-5.6
o USN-4749-1 : linux-gke-4.15, linux-image-oracle-lts-18.04, linux-aws,
linux-image-generic, linux-image-azure, linux-image-generic-lpae-hwe-16.04,
linux-image-4.15.0-136-generic-lpae, linux-raspi2, linux,
linux-image-generic-lpae, linux-image-4.15.0-1108-azure, linux-image-kvm,
linux-image-oem, linux-gcp, linux-azure-4.15, linux-image-powerpc64-emb,
linux-dell300x, linux-image-4.15.0-1012-dell300x, linux-image-aws-hwe,
linux-image-virtual-hwe-16.04, linux-image-4.15.0-1079-raspi2, linux-hwe,
linux-image-aws-lts-18.04, linux-image-gke-4.15, linux-image-dell300x,
linux-image-oracle, linux-image-raspi2, linux-oracle, linux-snapdragon,
linux-kvm, linux-image-gke, linux-image-4.15.0-1093-gcp,
linux-image-4.15.0-1079-gke, linux-image-generic-hwe-16.04,
linux-image-snapdragon, linux-azure, linux-image-4.15.0-136-generic,
linux-image-lowlatency-hwe-16.04, linux-image-lowlatency,
linux-image-4.15.0-1094-aws, linux-image-4.15.0-1065-oracle,
linux-image-gcp-lts-18.04, linux-image-powerpc64-smp,
linux-image-4.15.0-1096-snapdragon, linux-image-powerpc-e500mc,
linux-image-virtual, linux-image-gcp, linux-image-4.15.0-136-lowlatency,
linux-aws-hwe, linux-gcp-4.15, linux-image-powerpc-smp,
linux-image-azure-lts-18.04, linux-image-4.15.0-1085-kvm
o USN-4708-1 : linux-image-generic, linux-image-4.4.0-201-generic, linux,
linux-image-lowlatency-lts-xenial, linux-image-generic-lpae,
linux-image-virtual-lts-xenial, linux-image-powerpc64-emb-lts-xenial,
linux-image-4.4.0-201-powerpc-smp, linux-image-powerpc64-emb,
linux-image-4.4.0-201-powerpc64-emb, linux-image-generic-lts-xenial,
linux-lts-xenial, linux-image-powerpc64-smp-lts-xenial,
linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-201-powerpc64-smp,
linux-image-4.4.0-201-generic-lpae, linux-image-4.4.0-201-powerpc-e500mc,
linux-image-powerpc-e500mc-lts-xenial, linux-image-lowlatency,
linux-image-powerpc64-smp, linux-image-powerpc-e500mc,
linux-image-powerpc-smp-lts-xenial, linux-image-virtual,
linux-image-powerpc-smp, linux-image-4.4.0-201-lowlatency
o USN-4711-1 : linux-gke-4.15, linux-image-oracle-lts-18.04, linux-aws,
linux-image-4.15.0-1093-aws, linux-image-azure, linux-raspi2,
linux-image-kvm, linux-gcp, linux-azure-4.15,
linux-image-4.15.0-1078-raspi2, linux-image-aws-hwe,
linux-image-4.15.0-1095-snapdragon, linux-image-aws-lts-18.04,
linux-image-gke-4.15, linux-image-oracle, linux-image-raspi2, linux-oracle,
linux-snapdragon, linux-kvm, linux-image-gke,
linux-image-4.15.0-1064-oracle, linux-image-snapdragon, linux-azure,
linux-image-4.15.0-1078-gke, linux-image-gcp-lts-18.04, linux-image-gcp,
linux-aws-hwe, linux-gcp-4.15, linux-image-4.15.0-1084-kvm,
linux-image-azure-lts-18.04, linux-image-4.15.0-1092-gcp,
linux-image-4.15.0-1106-azure
o USN-4710-1 : linux-image-4.15.0-135-generic,
linux-image-4.15.0-135-lowlatency, linux-image-generic,
linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-135-generic-lpae,
linux, linux-image-generic-lpae, linux-image-oem,
linux-image-4.15.0-133-generic, linux-image-4.15.0-133-lowlatency,
linux-image-powerpc64-emb, linux-image-4.15.0-133-generic-lpae,
linux-image-virtual-hwe-16.04, linux-hwe, linux-image-generic-hwe-16.04,
linux-image-lowlatency-hwe-16.04, linux-image-lowlatency,
linux-image-powerpc64-smp, linux-image-powerpc-e500mc, linux-image-virtual,
linux-image-powerpc-smp
- --------------------------------------------------------------------------------
USN-4750-1: Linux kernel vulnerabilities
25 February 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gke-5.4 - Linux kernel for Google Container Engine (GKE) systems
o linux-gkeop - Linux kernel for Google Container Engine (GKE) systems
o linux-gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems
o linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-oracle-5.4 - Linux kernel for Oracle Cloud systems
o linux-raspi - Linux kernel for Raspberry Pi (V8) systems
o linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems
Details
Bodong Zhao discovered a use-after-free in the Sun keyboard driver
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service or possibly execute arbitrary code.
( CVE-2020-25669 )
It was discovered that the jfs file system implementation in the Linux
kernel contained an out-of-bounds read vulnerability. A local attacker
could use this to possibly cause a denial of service (system crash).
( CVE-2020-27815 )
Shisong Qin and Bodong Zhao discovered that Speakup screen reader driver in
the Linux kernel did not correctly handle setting line discipline in some
situations. A local attacker could use this to cause a denial of service
(system crash). ( CVE-2020-27830 , CVE-2020-28941 )
It was discovered that an information leak existed in the syscall
implementation in the Linux kernel on 32 bit systems. A local attacker
could use this to expose sensitive information (kernel memory).
( CVE-2020-28588 )
Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event
processing backend in the Linux kernel did not properly limit the number of
events queued. An attacker in a guest VM could use this to cause a denial
of service in the host OS. ( CVE-2020-29568 )
Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the
Xen paravirt block backend in the Linux kernel, leading to a use-after-free
vulnerability. An attacker in a guest VM could use this to cause a denial
of service in the host OS. ( CVE-2020-29569 )
Jann Horn discovered that the tty subsystem of the Linux kernel did not use
consistent locking in some situations, leading to a read-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly expose sensitive information (kernel memory).
( CVE-2020-29660 )
Jann Horn discovered a race condition in the tty subsystem of the Linux
kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-
free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2020-29661 )
It was discovered that the netfilter subsystem in the Linux kernel did not
properly handle filter rules in some situations. A local attacker with the
CAP_NET_ADMIN capability could use this to cause a denial of service.
( CVE-2021-20177 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-5.4.0-1010-gkeop - 5.4.0-1010.11
o linux-image-5.4.0-1029-raspi - 5.4.0-1029.32
o linux-image-5.4.0-1033-kvm - 5.4.0-1033.34
o linux-image-5.4.0-1037-gcp - 5.4.0-1037.40
o linux-image-5.4.0-1038-aws - 5.4.0-1038.40
o linux-image-5.4.0-1038-oracle - 5.4.0-1038.41
o linux-image-5.4.0-1040-azure - 5.4.0-1040.42
o linux-image-5.4.0-66-generic - 5.4.0-66.74
o linux-image-5.4.0-66-generic-lpae - 5.4.0-66.74
o linux-image-5.4.0-66-lowlatency - 5.4.0-66.74
o linux-image-aws - 5.4.0.1038.39
o linux-image-azure - 5.4.0.1040.38
o linux-image-gcp - 5.4.0.1037.46
o linux-image-generic - 5.4.0.66.69
o linux-image-generic-lpae - 5.4.0.66.69
o linux-image-gkeop - 5.4.0.1010.13
o linux-image-gkeop-5.4 - 5.4.0.1010.13
o linux-image-kvm - 5.4.0.1033.31
o linux-image-lowlatency - 5.4.0.66.69
o linux-image-oem - 5.4.0.66.69
o linux-image-oem-osp1 - 5.4.0.66.69
o linux-image-oracle - 5.4.0.1038.35
o linux-image-raspi - 5.4.0.1029.64
o linux-image-raspi2 - 5.4.0.1029.64
o linux-image-virtual - 5.4.0.66.69
Ubuntu 18.04
o linux-image-5.4.0-1010-gkeop - 5.4.0-1010.11~18.04.1
o linux-image-5.4.0-1029-raspi - 5.4.0-1029.32~18.04.1
o linux-image-5.4.0-1036-gke - 5.4.0-1036.38~18.04.1
o linux-image-5.4.0-1037-gcp - 5.4.0-1037.40~18.04.1
o linux-image-5.4.0-1038-aws - 5.4.0-1038.40~18.04.1
o linux-image-5.4.0-1038-oracle - 5.4.0-1038.41~18.04.1
o linux-image-5.4.0-1040-azure - 5.4.0-1040.42~18.04.1
o linux-image-5.4.0-66-generic - 5.4.0-66.74~18.04.2
o linux-image-5.4.0-66-generic-lpae - 5.4.0-66.74~18.04.2
o linux-image-5.4.0-66-lowlatency - 5.4.0-66.74~18.04.2
o linux-image-aws - 5.4.0.1038.22
o linux-image-azure - 5.4.0.1040.20
o linux-image-gcp - 5.4.0.1037.24
o linux-image-generic-hwe-18.04 - 5.4.0.66.74~18.04.61
o linux-image-generic-lpae-hwe-18.04 - 5.4.0.66.74~18.04.61
o linux-image-gke-5.4 - 5.4.0.1036.38~18.04.4
o linux-image-gkeop-5.4 - 5.4.0.1010.11~18.04.11
o linux-image-lowlatency-hwe-18.04 - 5.4.0.66.74~18.04.61
o linux-image-oem - 5.4.0.66.74~18.04.61
o linux-image-oem-osp1 - 5.4.0.66.74~18.04.61
o linux-image-oracle - 5.4.0.1038.41~18.04.21
o linux-image-raspi-hwe-18.04 - 5.4.0.1029.32
o linux-image-snapdragon-hwe-18.04 - 5.4.0.66.74~18.04.61
o linux-image-virtual-hwe-18.04 - 5.4.0.66.74~18.04.61
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2020-25669
o CVE-2020-28588
o CVE-2020-27815
o CVE-2020-29568
o CVE-2020-29660
o CVE-2020-29569
o CVE-2020-29661
o CVE-2021-20177
o CVE-2020-28941
o CVE-2020-27830
Related notices
o USN-4708-1 : linux-image-generic, linux-image-4.4.0-201-generic, linux,
linux-image-lowlatency-lts-xenial, linux-image-generic-lpae,
linux-image-virtual-lts-xenial, linux-image-powerpc64-emb-lts-xenial,
linux-image-4.4.0-201-powerpc-smp, linux-image-powerpc64-emb,
linux-image-4.4.0-201-powerpc64-emb, linux-image-generic-lts-xenial,
linux-lts-xenial, linux-image-powerpc64-smp-lts-xenial,
linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-201-powerpc64-smp,
linux-image-4.4.0-201-generic-lpae, linux-image-4.4.0-201-powerpc-e500mc,
linux-image-powerpc-e500mc-lts-xenial, linux-image-lowlatency,
linux-image-powerpc64-smp, linux-image-powerpc-e500mc,
linux-image-powerpc-smp-lts-xenial, linux-image-virtual,
linux-image-powerpc-smp, linux-image-4.4.0-201-lowlatency
o USN-4709-1 : linux-image-4.4.0-1085-aws, linux-aws, linux-image-raspi2,
linux-snapdragon, linux-image-4.4.0-1145-raspi2, linux-kvm,
linux-image-4.4.0-1087-kvm, linux-image-4.4.0-1149-snapdragon,
linux-image-snapdragon, linux-image-aws, linux-raspi2,
linux-image-4.4.0-1121-aws, linux-image-kvm
o USN-4748-1 : linux-image-4.4.0-1150-snapdragon,
linux-image-4.4.0-203-powerpc-e500mc, linux-aws, linux-image-generic,
linux-raspi2, linux, linux-image-lowlatency-lts-xenial,
linux-image-generic-lpae, linux-image-4.4.0-203-generic-lpae,
linux-image-kvm, linux-image-4.4.0-203-generic,
linux-image-virtual-lts-xenial, linux-image-powerpc64-emb-lts-xenial,
linux-image-4.4.0-203-powerpc64-smp, linux-image-4.4.0-1122-aws,
linux-image-powerpc64-emb, linux-image-4.4.0-1086-aws,
linux-image-4.4.0-1088-kvm, linux-image-generic-lts-xenial,
linux-lts-xenial, linux-image-raspi2, linux-snapdragon,
linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lpae-lts-xenial,
linux-kvm, linux-image-snapdragon, linux-image-aws,
linux-image-4.4.0-203-powerpc-smp, linux-image-powerpc-e500mc-lts-xenial,
linux-image-lowlatency, linux-image-4.4.0-1146-raspi2,
linux-image-powerpc64-smp, linux-image-4.4.0-203-lowlatency,
linux-image-powerpc-e500mc, linux-image-powerpc-smp-lts-xenial,
linux-image-virtual, linux-image-4.4.0-203-powerpc64-emb,
linux-image-powerpc-smp
o USN-4749-1 : linux-gke-4.15, linux-image-oracle-lts-18.04, linux-aws,
linux-image-generic, linux-image-azure, linux-image-generic-lpae-hwe-16.04,
linux-image-4.15.0-136-generic-lpae, linux-raspi2, linux,
linux-image-generic-lpae, linux-image-4.15.0-1108-azure, linux-image-kvm,
linux-image-oem, linux-gcp, linux-azure-4.15, linux-image-powerpc64-emb,
linux-dell300x, linux-image-4.15.0-1012-dell300x, linux-image-aws-hwe,
linux-image-virtual-hwe-16.04, linux-image-4.15.0-1079-raspi2, linux-hwe,
linux-image-aws-lts-18.04, linux-image-gke-4.15, linux-image-dell300x,
linux-image-oracle, linux-image-raspi2, linux-oracle, linux-snapdragon,
linux-kvm, linux-image-gke, linux-image-4.15.0-1093-gcp,
linux-image-4.15.0-1079-gke, linux-image-generic-hwe-16.04,
linux-image-snapdragon, linux-azure, linux-image-4.15.0-136-generic,
linux-image-lowlatency-hwe-16.04, linux-image-lowlatency,
linux-image-4.15.0-1094-aws, linux-image-4.15.0-1065-oracle,
linux-image-gcp-lts-18.04, linux-image-powerpc64-smp,
linux-image-4.15.0-1096-snapdragon, linux-image-powerpc-e500mc,
linux-image-virtual, linux-image-gcp, linux-image-4.15.0-136-lowlatency,
linux-aws-hwe, linux-gcp-4.15, linux-image-powerpc-smp,
linux-image-azure-lts-18.04, linux-image-4.15.0-1085-kvm
o USN-4751-1 : linux-image-5.8.0-1016-raspi-nolpae, linux-aws,
linux-image-generic, linux-image-raspi, linux-image-azure,
linux-image-virtual-hwe-20.04, linux-image-generic-lpae-hwe-20.04, linux,
linux-image-generic-64k, linux-image-generic-lpae, linux-image-kvm,
linux-image-5.8.0-44-generic-64k, linux-raspi,
linux-image-lowlatency-hwe-20.04, linux-hwe-5.8, linux-gcp,
linux-image-5.8.0-44-generic, linux-image-5.8.0-1021-oracle,
linux-image-5.8.0-1023-gcp, linux-image-generic-64k-hwe-20.04,
linux-image-oracle, linux-oracle, linux-kvm, linux-image-gke,
linux-image-5.8.0-1024-aws, linux-azure, linux-image-aws,
linux-image-oem-20.04, linux-image-5.8.0-1019-kvm,
linux-image-5.8.0-1023-azure, linux-image-5.8.0-44-lowlatency,
linux-image-5.8.0-1016-raspi, linux-image-lowlatency, linux-image-virtual,
linux-image-gcp, linux-image-raspi-nolpae,
linux-image-5.8.0-44-generic-lpae, linux-image-generic-hwe-20.04
o USN-4752-1 : linux-oem-5.6, linux-image-oem-20.04,
linux-image-5.6.0-1048-oem
- --------------------------------------------------------------------------------
USN-4748-1: Linux kernel vulnerabilities
25 February 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-kvm - Linux kernel for cloud environments
o linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
It was discovered that the jfs file system implementation in the Linux
kernel contained an out-of-bounds read vulnerability. A local attacker
could use this to possibly cause a denial of service (system crash).
( CVE-2020-27815 )
It was discovered that the memory management subsystem in the Linux kernel
did not properly handle copy-on-write operations in some situations. A
local attacker could possibly use this to gain unintended write access to
read-only memory pages. ( CVE-2020-29374 )
Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event
processing backend in the Linux kernel did not properly limit the number of
events queued. An attacker in a guest VM could use this to cause a denial
of service in the host OS. ( CVE-2020-29568 )
Jann Horn discovered that the tty subsystem of the Linux kernel did not use
consistent locking in some situations, leading to a read-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly expose sensitive information (kernel memory).
( CVE-2020-29660 )
Jann Horn discovered a race condition in the tty subsystem of the Linux
kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-
free vulnerability. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2020-29661 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o linux-image-4.4.0-1088-kvm - 4.4.0-1088.97
o linux-image-4.4.0-1122-aws - 4.4.0-1122.136
o linux-image-4.4.0-1146-raspi2 - 4.4.0-1146.156
o linux-image-4.4.0-1150-snapdragon - 4.4.0-1150.160
o linux-image-4.4.0-203-generic - 4.4.0-203.235
o linux-image-4.4.0-203-generic-lpae - 4.4.0-203.235
o linux-image-4.4.0-203-lowlatency - 4.4.0-203.235
o linux-image-4.4.0-203-powerpc-e500mc - 4.4.0-203.235
o linux-image-4.4.0-203-powerpc-smp - 4.4.0-203.235
o linux-image-4.4.0-203-powerpc64-emb - 4.4.0-203.235
o linux-image-4.4.0-203-powerpc64-smp - 4.4.0-203.235
o linux-image-aws - 4.4.0.1122.127
o linux-image-generic - 4.4.0.203.209
o linux-image-generic-lpae - 4.4.0.203.209
o linux-image-kvm - 4.4.0.1088.86
o linux-image-lowlatency - 4.4.0.203.209
o linux-image-powerpc-e500mc - 4.4.0.203.209
o linux-image-powerpc-smp - 4.4.0.203.209
o linux-image-powerpc64-emb - 4.4.0.203.209
o linux-image-powerpc64-smp - 4.4.0.203.209
o linux-image-raspi2 - 4.4.0.1146.146
o linux-image-snapdragon - 4.4.0.1150.142
o linux-image-virtual - 4.4.0.203.209
Ubuntu 14.04
o linux-image-4.4.0-1086-aws - 4.4.0-1086.90
o linux-image-4.4.0-203-generic - 4.4.0-203.235~14.04.1
o linux-image-4.4.0-203-generic-lpae - 4.4.0-203.235~14.04.1
o linux-image-4.4.0-203-lowlatency - 4.4.0-203.235~14.04.1
o linux-image-4.4.0-203-powerpc-e500mc - 4.4.0-203.235~14.04.1
o linux-image-4.4.0-203-powerpc-smp - 4.4.0-203.235~14.04.1
o linux-image-4.4.0-203-powerpc64-emb - 4.4.0-203.235~14.04.1
o linux-image-4.4.0-203-powerpc64-smp - 4.4.0-203.235~14.04.1
o linux-image-aws - 4.4.0.1086.83
o linux-image-generic-lpae-lts-xenial - 4.4.0.203.177
o linux-image-generic-lts-xenial - 4.4.0.203.177
o linux-image-lowlatency-lts-xenial - 4.4.0.203.177
o linux-image-powerpc-e500mc-lts-xenial - 4.4.0.203.177
o linux-image-powerpc-smp-lts-xenial - 4.4.0.203.177
o linux-image-powerpc64-emb-lts-xenial - 4.4.0.203.177
o linux-image-powerpc64-smp-lts-xenial - 4.4.0.203.177
o linux-image-virtual-lts-xenial - 4.4.0.203.177
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2020-29660
o CVE-2020-29374
o CVE-2020-29661
o CVE-2020-29568
o CVE-2020-27815
Related notices
o USN-4751-1 : linux-gcp, linux-image-5.8.0-1016-raspi,
linux-image-5.8.0-44-generic, linux-image-generic-64k-hwe-20.04,
linux-image-5.8.0-44-lowlatency, linux, linux-image-5.8.0-44-generic-64k,
linux-azure, linux-image-gcp, linux-image-raspi-nolpae, linux-image-aws,
linux-raspi, linux-image-oem-20.04, linux-image-virtual-hwe-20.04,
linux-aws, linux-image-5.8.0-1019-kvm, linux-image-kvm, linux-image-oracle,
linux-image-5.8.0-1023-azure, linux-image-5.8.0-1024-aws, linux-kvm,
linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-image-virtual,
linux-image-azure, linux-image-5.8.0-44-generic-lpae, linux-hwe-5.8,
linux-image-generic-hwe-20.04, linux-image-gke,
linux-image-5.8.0-1021-oracle, linux-image-lowlatency,
linux-image-generic-64k, linux-image-5.8.0-1023-gcp,
linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1016-raspi-nolpae,
linux-image-raspi, linux-image-generic-lpae, linux-oracle
o USN-4752-1 : linux-image-oem-20.04, linux-oem-5.6,
linux-image-5.6.0-1048-oem
o USN-4750-1 : linux-image-raspi2, linux-gcp, linux-image-raspi-hwe-18.04,
linux-gkeop-5.4, linux-image-virtual-hwe-18.04, linux-oracle-5.4,
linux-image-5.4.0-1038-oracle, linux, linux-azure, linux-image-gcp,
linux-image-5.4.0-1033-kvm, linux-image-5.4.0-1037-gcp, linux-raspi,
linux-hwe-5.4, linux-image-aws, linux-image-gke-5.4, linux-gcp-5.4,
linux-gkeop, linux-raspi-5.4, linux-image-5.4.0-1040-azure,
linux-image-5.4.0-66-generic, linux-image-5.4.0-1038-aws, linux-aws,
linux-image-kvm, linux-image-oracle, linux-image-5.4.0-66-lowlatency,
linux-kvm, linux-image-generic-hwe-18.04, linux-image-generic,
linux-image-lowlatency-hwe-18.04, linux-image-virtual,
linux-image-5.4.0-1010-gkeop, linux-gke-5.4,
linux-image-generic-lpae-hwe-18.04, linux-image-azure, linux-image-raspi,
linux-image-gkeop, linux-image-lowlatency, linux-azure-5.4,
linux-image-oem, linux-image-oem-osp1, linux-image-snapdragon-hwe-18.04,
linux-image-5.4.0-1036-gke, linux-image-5.4.0-1029-raspi,
linux-image-gkeop-5.4, linux-image-generic-lpae, linux-aws-5.4,
linux-oracle, linux-image-5.4.0-66-generic-lpae
o USN-4749-1 : linux-image-raspi2, linux-gcp, linux-gke-4.15, linux-aws-hwe,
linux-dell300x, linux-image-gke-4.15, linux-image-generic-lpae-hwe-16.04,
linux-image-powerpc64-smp, linux-image-aws-hwe,
linux-image-4.15.0-136-lowlatency, linux-image-4.15.0-1085-kvm, linux,
linux-azure-4.15, linux-image-4.15.0-1093-gcp, linux-azure,
linux-image-gcp, linux-raspi2, linux-image-4.15.0-1065-oracle,
linux-image-4.15.0-1012-dell300x, linux-image-generic-hwe-16.04,
linux-image-powerpc64-emb, linux-image-azure-lts-18.04,
linux-image-powerpc-e500mc, linux-image-4.15.0-136-generic-lpae,
linux-snapdragon, linux-aws, linux-image-kvm, linux-image-oracle,
linux-image-dell300x, linux-image-4.15.0-1108-azure,
linux-image-snapdragon, linux-image-lowlatency-hwe-16.04, linux-kvm,
linux-image-generic, linux-gcp-4.15, linux-image-4.15.0-1079-gke,
linux-image-virtual, linux-image-azure, linux-image-4.15.0-1079-raspi2,
linux-image-gcp-lts-18.04, linux-image-gke, linux-image-lowlatency,
linux-image-powerpc-smp, linux-image-4.15.0-136-generic,
linux-image-oracle-lts-18.04, linux-image-oem,
linux-image-4.15.0-1096-snapdragon, linux-hwe, linux-image-4.15.0-1094-aws,
linux-image-aws-lts-18.04, linux-image-virtual-hwe-16.04,
linux-image-generic-lpae, linux-oracle
- --------------------------END INCLUDED TEXT--------------------
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