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AUSCERT External Security Bulletin Redistribution
ESB-2021.1919
USN-4977-1: Linux kernel vulnerabilities
3 June 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Linux kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-33033 CVE-2021-31916 CVE-2021-29647
CVE-2021-29155 CVE-2021-28972 CVE-2021-28971
CVE-2021-28964 CVE-2021-28660 CVE-2021-3501
CVE-2021-3483 CVE-2021-3428 CVE-2020-25673
CVE-2020-25672 CVE-2020-25671 CVE-2020-25670
Reference: ESB-2021.1694
ESB-2021.1655
Original Bulletin:
https://ubuntu.com/security/notices/USN-4977-1
https://ubuntu.com/security/notices/USN-4979-1
Comment: This bulletin contains two (2) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4977-1: Linux kernel vulnerabilities
02 June 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 21.04
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-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
Details
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel contained a reference counting error. A local attacker could
use this to cause a denial of service (system crash). ( CVE-2020-25670 )
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly deallocate memory in certain error
situations. A local attacker could use this to cause a denial of service
(memory exhaustion). ( CVE-2020-25671 , CVE-2020-25672 )
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly handle error conditions in some situations,
leading to an infinite loop. A local attacker could use this to cause a
denial of service. ( CVE-2020-25673 )
Piotr Krysiuk and Benedict Schlueter discovered that the eBPF
implementation in the Linux kernel performed out of bounds speculation on
pointer arithmetic. A local attacker could use this to expose sensitive
information. ( CVE-2021-29155 )
Reiji Watanabe discovered that the KVM VMX implementation in the Linux
kernel did not properly prevent user space from tampering with an array
index value, leading to a potential out-of-bounds write. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. ( CVE-2021-3501 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o linux-image-5.11.0-1008-aws - 5.11.0-1008.8
o linux-image-5.11.0-1008-gcp - 5.11.0-1008.9
o linux-image-5.11.0-1006-azure - 5.11.0-1006.6
o linux-image-oracle - 5.11.0.1007.7
o linux-image-azure - 5.11.0.1006.6
o linux-image-5.11.0-1008-kvm - 5.11.0-1008.8
o linux-image-5.11.0-18-lowlatency - 5.11.0-18.19
o linux-image-virtual - 5.11.0.18.19
o linux-image-gke - 5.11.0.1008.8
o linux-image-generic-64k - 5.11.0.18.19
o linux-image-generic - 5.11.0.18.19
o linux-image-5.11.0-18-generic - 5.11.0-18.19
o linux-image-5.11.0-18-generic-64k - 5.11.0-18.19
o linux-image-aws - 5.11.0.1008.8
o linux-image-kvm - 5.11.0.1008.8
o linux-image-5.11.0-18-generic-lpae - 5.11.0-18.19
o linux-image-5.11.0-1007-oracle - 5.11.0-1007.7
o linux-image-generic-lpae - 5.11.0.18.19
o linux-image-gcp - 5.11.0.1008.8
o linux-image-lowlatency - 5.11.0.18.19
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-2020-25673
o CVE-2021-3501
o CVE-2021-29155
o CVE-2020-25672
o CVE-2020-25670
o CVE-2020-25671
Related notices
o USN-4948-1 : linux-image-oem-20.04-edge, linux-oem-5.10,
linux-image-5.10.0-1026-oem, linux-image-oem-20.04b
- --------------------------------------------------------------------------------
USN-4979-1: Linux kernel vulnerabilities
03 June 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 ESM
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-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) 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-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel contained a reference counting error. A local attacker could
use this to cause a denial of service (system crash). ( CVE-2020-25670 )
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly deallocate memory in certain error
situations. A local attacker could use this to cause a denial of service
(memory exhaustion). ( CVE-2020-25671 , CVE-2020-25672 )
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly handle error conditions in some situations,
leading to an infinite loop. A local attacker could use this to cause a
denial of service. ( CVE-2020-25673 )
It was discovered that the Realtek RTL8188EU Wireless device driver in the
Linux kernel did not properly validate ssid lengths in some situations. An
attacker could use this to cause a denial of service (system crash).
( CVE-2021-28660 )
Zygo Blaxell discovered that the btrfs file system implementation in the
Linux kernel contained a race condition during certain cloning operations.
A local attacker could possibly use this to cause a denial of service
(system crash). ( CVE-2021-28964 )
Vince Weaver discovered that the perf subsystem in the Linux kernel did not
properly handle certain PEBS records properly for some Intel Haswell
processors. A local attacker could use this to cause a denial of service
(system crash). ( CVE-2021-28971 )
It was discovered that the RPA PCI Hotplug driver implementation in the
Linux kernel did not properly handle device name writes via sysfs, leading
to a buffer overflow. A privileged attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
( CVE-2021-28972 )
It was discovered that the Qualcomm IPC router implementation in the Linux
kernel did not properly initialize memory passed to user space. A local
attacker could use this to expose sensitive information (kernel memory).
( CVE-2021-29647 )
Dan Carpenter discovered that the block device manager (dm) implementation
in the Linux kernel contained a buffer overflow in the ioctl for listing
devices. A privileged local attacker could use this to cause a denial of
service (system crash). ( CVE-2021-31916 )
It was discovered that the CIPSO implementation in the Linux kernel did not
properly perform reference counting in some situations, leading to use-
after-free vulnerabilities. An attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2021-33033 )
Wolfgang Frisch discovered that the ext4 file system implementation in the
Linux kernel contained an integer overflow when handling metadata inode
extents. An attacker could use this to construct a malicious ext4 file
system image that, when mounted, could cause a denial of service (system
crash). ( CVE-2021-3428 )
discovered that the IEEE 1394 (Firewire) nosy packet sniffer driver 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) or possibly
execute arbitrary code. ( CVE-2021-3483 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-4.15.0-1100-gcp - 4.15.0-1100.113
o linux-image-4.15.0-1092-kvm - 4.15.0-1092.94
o linux-image-4.15.0-144-generic-lpae - 4.15.0-144.148
o linux-image-gcp-lts-18.04 - 4.15.0.1100.118
o linux-image-oracle-lts-18.04 - 4.15.0.1072.82
o linux-image-4.15.0-1103-snapdragon - 4.15.0-1103.112
o linux-image-virtual - 4.15.0.144.131
o linux-image-snapdragon - 4.15.0.1103.106
o linux-image-4.15.0-144-generic - 4.15.0-144.148
o linux-image-4.15.0-1072-oracle - 4.15.0-1072.80
o linux-image-aws-lts-18.04 - 4.15.0.1103.106
o linux-image-generic - 4.15.0.144.131
o linux-image-4.15.0-1103-aws - 4.15.0-1103.110
o linux-image-4.15.0-1115-azure - 4.15.0-1115.128
o linux-image-kvm - 4.15.0.1092.88
o linux-image-azure-lts-18.04 - 4.15.0.1115.88
o linux-image-4.15.0-144-lowlatency - 4.15.0-144.148
o linux-image-generic-lpae - 4.15.0.144.131
o linux-image-lowlatency - 4.15.0.144.131
Ubuntu 16.04
o linux-image-gke - 4.15.0.1100.101
Available with UA Infra or UA Desktop
o linux-image-oracle - 4.15.0.1072.60
Available with UA Infra or UA Desktop
o linux-image-4.15.0-1100-gcp - 4.15.0-1100.113~16.04.1
Available with UA Infra or UA Desktop
o linux-image-4.15.0-144-lowlatency - 4.15.0-144.148~16.04.1
Available with UA Infra or UA Desktop
o linux-image-4.15.0-1103-aws - 4.15.0-1103.110~16.04.1
Available with UA Infra or UA Desktop
o linux-image-lowlatency-hwe-16.04 - 4.15.0.144.140
Available with UA Infra or UA Desktop
o linux-image-4.15.0-1115-azure - 4.15.0-1115.128~16.04.1
Available with UA Infra or UA Desktop
o linux-image-generic-hwe-16.04 - 4.15.0.144.140
Available with UA Infra or UA Desktop
o linux-image-4.15.0-144-generic - 4.15.0-144.148~16.04.1
Available with UA Infra or UA Desktop
o linux-image-gcp - 4.15.0.1100.101
Available with UA Infra or UA Desktop
o linux-image-oem - 4.15.0.144.140
Available with UA Infra or UA Desktop
o linux-image-virtual-hwe-16.04 - 4.15.0.144.140
Available with UA Infra or UA Desktop
o linux-image-azure - 4.15.0.1115.106
Available with UA Infra or UA Desktop
o linux-image-aws-hwe - 4.15.0.1103.94
Available with UA Infra or UA Desktop
o linux-image-4.15.0-1072-oracle - 4.15.0-1072.80~16.04.1
Available with UA Infra or UA Desktop
Ubuntu 14.04
o linux-image-4.15.0-1115-azure - 4.15.0-1115.128~14.04.1
Available with UA Infra or UA Desktop
o linux-image-azure - 4.15.0.1115.88
Available with UA Infra or UA Desktop
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-2021-31916
o CVE-2021-3428
o CVE-2020-25670
o CVE-2020-25673
o CVE-2020-25672
o CVE-2021-28660
o CVE-2021-28971
o CVE-2021-28964
o CVE-2021-29647
o CVE-2021-3483
o CVE-2021-33033
o CVE-2020-25671
o CVE-2021-28972
Related notices
o USN-4945-1 : linux-image-generic-lpae, linux-image-generic-lpae-hwe-18.04,
linux-image-5.4.0-1043-gcp, linux-image-5.4.0-73-generic,
linux-image-snapdragon-hwe-18.04-edge, linux-gke, linux-gcp-5.4,
linux-image-5.4.0-73-generic-lpae, linux-image-generic-lpae-hwe-18.04-edge,
linux-image-gke, linux-image-virtual-hwe-18.04, linux-aws,
linux-image-oracle-edge, linux-gcp, linux-image-virtual-hwe-18.04-edge,
linux-image-5.4.0-1015-gkeop, linux-image-lowlatency, linux,
linux-image-5.4.0-1039-kvm, linux-image-oem, linux-image-5.4.0-1045-oracle,
linux-oracle, linux-image-snapdragon-hwe-18.04, linux-gkeop,
linux-image-gke-5.4, linux-image-virtual, linux-gke-5.4, linux-image-kvm,
linux-kvm, linux-azure-5.4, linux-image-5.4.0-1044-oracle,
linux-image-lowlatency-hwe-18.04-edge, linux-image-5.4.0-73-lowlatency,
linux-image-5.4.0-1047-azure, linux-image-gcp, linux-image-azure,
linux-hwe-5.4, linux-image-gcp-edge, linux-image-azure-edge,
linux-image-generic-hwe-18.04, linux-aws-5.4, linux-image-gkeop-5.4,
linux-image-aws, linux-image-generic, linux-oracle-5.4,
linux-image-5.4.0-1043-gke, linux-image-lowlatency-hwe-18.04,
linux-gkeop-5.4, linux-image-5.4.0-1048-aws, linux-image-gkeop,
linux-image-oracle, linux-image-aws-edge,
linux-image-generic-hwe-18.04-edge, linux-image-oem-osp1, linux-azure
o USN-4945-2 : linux-image-raspi2-hwe-18.04-edge,
linux-image-raspi2-hwe-18.04, linux-image-raspi-hwe-18.04, linux-raspi-5.4,
linux-image-raspi, linux-image-raspi2, linux-image-5.4.0-1035-raspi,
linux-image-raspi-hwe-18.04-edge, linux-raspi
o USN-4948-1 : linux-image-5.10.0-1026-oem, linux-oem-5.10,
linux-image-oem-20.04b, linux-image-oem-20.04-edge
o USN-4977-1 : linux-image-generic-lpae,
linux-image-generic-64k-hwe-20.04-edge, linux-image-gke,
linux-image-generic-64k, linux-aws, linux-gcp, linux-image-oem-20.04,
linux-image-lowlatency, linux-image-5.11.0-18-generic-64k,
linux-image-virtual-hwe-20.04, linux, linux-image-5.11.0-1006-azure,
linux-image-5.11.0-1008-aws, linux-oracle, linux-image-raspi,
linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual,
linux-image-5.11.0-1008-gcp, linux-image-raspi-nolpae,
linux-image-lowlatency-hwe-20.04-edge, linux-image-5.11.0-18-generic-lpae,
linux-raspi, linux-image-5.11.0-1009-raspi-nolpae, linux-image-kvm,
linux-kvm, linux-image-5.11.0-1007-oracle, linux-image-5.11.0-1009-raspi,
linux-image-generic-lpae-hwe-20.04, linux-image-lowlatency-hwe-20.04,
linux-image-gcp, linux-image-generic-hwe-20.04, linux-image-azure,
linux-image-virtual-hwe-20.04-edge, linux-image-5.11.0-1008-kvm,
linux-image-aws, linux-image-5.11.0-18-generic, linux-image-generic,
linux-image-generic-64k-hwe-20.04, linux-image-generic-hwe-20.04-edge,
linux-image-oracle, linux-image-5.11.0-18-lowlatency, linux-azure
- --------------------------END INCLUDED TEXT--------------------
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