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AUSCERT External Security Bulletin Redistribution
ESB-2021.0071
USN-4681-1: Linux kernel vulnerabilities
7 January 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-28974 CVE-2020-27675 CVE-2020-25668
CVE-2020-25656 CVE-2020-4788 CVE-2019-0148
Reference: ESB-2020.4391
ESB-2020.4375
ESB-2020.4284
Original Bulletin:
https://ubuntu.com/security/notices/USN-4681-1
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4681-1: Linux kernel vulnerabilities
06 January 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
Ryan Hall discovered that the Intel 700 Series Ethernet Controllers driver
in the Linux kernel did not properly deallocate memory in some conditions.
A local attacker could use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-0148)
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)
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)
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)
It was discovered that Power 9 processors could be coerced to expose
information from the L1 cache in certain situations. A local attacker could
use this to expose sensitive information. (CVE-2020-4788)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o linux-image-4.4.0-1085-kvm - 4.4.0-1085.94
o linux-image-4.4.0-1119-aws - 4.4.0-1119.133
o linux-image-4.4.0-1143-raspi2 - 4.4.0-1143.153
o linux-image-4.4.0-1147-snapdragon - 4.4.0-1147.157
o linux-image-4.4.0-198-generic - 4.4.0-198.230
o linux-image-4.4.0-198-generic-lpae - 4.4.0-198.230
o linux-image-4.4.0-198-lowlatency - 4.4.0-198.230
o linux-image-4.4.0-198-powerpc-e500mc - 4.4.0-198.230
o linux-image-4.4.0-198-powerpc-smp - 4.4.0-198.230
o linux-image-4.4.0-198-powerpc64-emb - 4.4.0-198.230
o linux-image-4.4.0-198-powerpc64-smp - 4.4.0-198.230
o linux-image-aws - 4.4.0.1119.124
o linux-image-generic - 4.4.0.198.204
o linux-image-generic-lpae - 4.4.0.198.204
o linux-image-kvm - 4.4.0.1085.83
o linux-image-lowlatency - 4.4.0.198.204
o linux-image-powerpc-e500mc - 4.4.0.198.204
o linux-image-powerpc-smp - 4.4.0.198.204
o linux-image-powerpc64-emb - 4.4.0.198.204
o linux-image-powerpc64-smp - 4.4.0.198.204
o linux-image-raspi2 - 4.4.0.1143.143
o linux-image-snapdragon - 4.4.0.1147.139
o linux-image-virtual - 4.4.0.198.204
Ubuntu 14.04
o linux-image-4.4.0-1083-aws - 4.4.0-1083.87
o linux-image-4.4.0-198-generic - 4.4.0-198.230~14.04.1
o linux-image-4.4.0-198-generic-lpae - 4.4.0-198.230~14.04.1
o linux-image-4.4.0-198-lowlatency - 4.4.0-198.230~14.04.1
o linux-image-4.4.0-198-powerpc-e500mc - 4.4.0-198.230~14.04.1
o linux-image-4.4.0-198-powerpc-smp - 4.4.0-198.230~14.04.1
o linux-image-4.4.0-198-powerpc64-emb - 4.4.0-198.230~14.04.1
o linux-image-4.4.0-198-powerpc64-smp - 4.4.0-198.230~14.04.1
o linux-image-aws - 4.4.0.1083.80
o linux-image-generic-lpae-lts-xenial - 4.4.0.198.173
o linux-image-generic-lts-xenial - 4.4.0.198.173
o linux-image-lowlatency-lts-xenial - 4.4.0.198.173
o linux-image-powerpc-e500mc-lts-xenial - 4.4.0.198.173
o linux-image-powerpc-smp-lts-xenial - 4.4.0.198.173
o linux-image-powerpc64-emb-lts-xenial - 4.4.0.198.173
o linux-image-powerpc64-smp-lts-xenial - 4.4.0.198.173
o linux-image-virtual-lts-xenial - 4.4.0.198.173
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-2020-25668
o CVE-2020-4788
o CVE-2019-0148
o CVE-2020-28974
o CVE-2020-27675
o CVE-2020-25656
Related notices
o USN-4657-1 : linux-image-4.4.0-197-lowlatency, linux-image-kvm,
linux-image-4.4.0-197-powerpc-e500mc, linux-image-4.4.0-1082-aws,
linux-image-powerpc-e500mc, linux-image-generic-lpae-lts-xenial,
linux-image-4.4.0-197-generic, linux-image-raspi2,
linux-image-4.4.0-197-generic-lpae, linux-image-4.4.0-1118-aws,
linux-image-powerpc-smp-lts-xenial, linux-image-virtual-lts-xenial,
linux-image-4.4.0-197-powerpc-smp, linux-image-4.4.0-1146-snapdragon,
linux-image-4.4.0-197-powerpc64-emb, linux-image-powerpc-smp, linux-kvm,
linux-image-generic, linux-image-4.4.0-1084-kvm,
linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc64-smp,
linux-lts-xenial, linux-image-4.4.0-1142-raspi2, linux-image-generic-lpae,
linux-image-powerpc-e500mc-lts-xenial, linux-raspi2, linux-aws,
linux-image-virtual, linux-image-generic-lts-xenial, linux,
linux-image-powerpc64-smp-lts-xenial, linux-snapdragon,
linux-image-lowlatency, linux-image-4.4.0-197-powerpc64-smp,
linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb,
linux-image-aws, linux-image-snapdragon
o USN-4680-1 : linux-image-kvm, linux-image-azure,
linux-image-4.15.0-1082-kvm, linux-image-powerpc-e500mc, linux-gcp-4.15,
linux-image-4.15.0-1103-azure, linux-image-raspi2,
linux-image-4.15.0-129-generic-lpae, linux-image-4.15.0-129-lowlatency,
linux-image-4.15.0-1077-raspi2, linux-gke-4.15,
linux-image-4.15.0-129-generic, linux-image-4.15.0-1094-snapdragon,
linux-image-azure-lts-18.04, linux-image-powerpc-smp,
linux-image-4.15.0-1062-oracle, linux-image-gke, linux-image-oracle,
linux-image-generic-hwe-16.04, linux-image-virtual-hwe-16.04,
linux-image-generic-lpae-hwe-16.04, linux-image-gke-4.15, linux-azure-4.15,
linux-kvm, linux-image-aws-lts-18.04, linux-image-gcp,
linux-image-4.15.0-1091-gcp, linux-image-generic, linux-image-aws-hwe,
linux-image-powerpc64-smp, linux-image-generic-lpae, linux-raspi2,
linux-aws-hwe, linux-azure, linux-aws, linux-oracle,
linux-image-gcp-lts-18.04, linux-image-virtual,
linux-image-4.15.0-1077-gke, linux-image-oracle-lts-18.04,
linux-image-4.15.0-1091-aws, linux-image-lowlatency-hwe-16.04, linux,
linux-snapdragon, linux-image-lowlatency, linux-image-oem,
linux-image-powerpc64-emb, linux-hwe, linux-gcp, linux-image-snapdragon
o USN-4679-1 : linux-oracle-5.4, linux-image-kvm, linux-image-azure,
linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-59-generic-lpae,
linux-image-5.4.0-1026-raspi, linux-image-5.4.0-1033-gke,
linux-image-raspi2, linux-image-oem-osp1, linux-image-virtual-hwe-18.04,
linux-aws-5.4, linux-image-5.4.0-1035-azure, linux-image-gke-5.4,
linux-gcp-5.4, linux-image-generic-lpae-hwe-18.04, linux-image-oracle,
linux-image-5.4.0-1034-oracle, linux-image-raspi-hwe-18.04,
linux-image-5.4.0-59-generic, linux-kvm, linux-image-gcp,
linux-image-generic, linux-image-5.4.0-1031-kvm, linux-gke-5.4,
linux-image-generic-lpae, linux-azure, linux-azure-5.4, linux-aws,
linux-image-generic-hwe-18.04, linux-hwe-5.4, linux-oracle,
linux-image-virtual, linux-raspi, linux-raspi-5.4,
linux-image-5.4.0-1034-aws, linux-image-lowlatency-hwe-18.04, linux,
linux-image-5.4.0-1033-gcp, linux-image-5.4.0-59-lowlatency,
linux-image-lowlatency, linux-image-oem, linux-image-raspi,
linux-image-aws, linux-gcp
o USN-4659-1 : linux-image-kvm, linux-image-azure, linux-image-generic-64k,
linux-image-raspi-nolpae, linux-image-5.8.0-1012-gcp,
linux-image-5.8.0-31-generic-lpae, linux-image-5.8.0-1008-raspi-nolpae,
linux-image-gke, linux-image-oracle, linux-kvm, linux-image-gcp,
linux-image-generic, linux-image-5.8.0-1011-kvm,
linux-image-5.8.0-1011-oracle, linux-image-5.8.0-1013-azure,
linux-image-5.8.0-31-generic, linux-image-5.8.0-31-generic-64k,
linux-image-5.8.0-31-lowlatency, linux-image-generic-lpae,
linux-image-oem-20.04, linux-azure, linux-image-5.8.0-1014-aws, linux-aws,
linux-oracle, linux-raspi, linux-image-virtual,
linux-image-5.8.0-1008-raspi, linux, linux-image-lowlatency,
linux-image-raspi, linux-image-aws, linux-gcp
o USN-4660-1 : linux-image-kvm, linux-image-azure, linux-oem,
linux-image-4.15.0-126-generic-lpae, linux-gcp-4.15,
linux-image-powerpc-e500mc, linux-image-raspi2, linux-image-azure-edge,
linux-gke-4.15, linux-image-4.15.0-1088-aws, linux-image-azure-lts-18.04,
linux-image-powerpc-smp, linux-image-4.15.0-1103-oem, linux-image-gke,
linux-image-oracle, linux-image-generic-hwe-16.04,
linux-image-4.15.0-1100-azure, linux-image-virtual-hwe-16.04,
linux-image-generic-lpae-hwe-16.04, linux-image-gke-4.15, linux-azure-4.15,
linux-kvm, linux-image-4.15.0-1079-kvm, linux-image-aws-lts-18.04,
linux-image-gcp, linux-image-generic, linux-image-aws-hwe,
linux-image-powerpc64-smp, linux-image-generic-lpae, linux-raspi2,
linux-aws-hwe, linux-azure, linux-image-4.15.0-1074-raspi2,
linux-image-4.15.0-126-generic, linux-aws, linux-image-gcp-lts-18.04,
linux-image-virtual, linux-image-4.15.0-126-lowlatency, linux-oracle,
linux-image-oracle-lts-18.04, linux-image-lowlatency-hwe-16.04,
linux-image-4.15.0-1088-gcp, linux, linux-image-4.15.0-1091-snapdragon,
linux-image-4.15.0-1059-oracle, linux-snapdragon,
linux-image-4.15.0-1074-gke, linux-image-lowlatency, linux-image-oem,
linux-image-powerpc64-emb, linux-hwe, linux-gcp, linux-image-snapdragon
o USN-4658-1 : linux-oracle-5.4, linux-image-kvm, linux-image-azure,
linux-image-generic-hwe-20.04, linux-image-5.4.0-1028-kvm,
linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-56-generic-lpae,
linux-image-raspi2, linux-image-oem-osp1, linux-image-virtual-hwe-18.04,
linux-image-5.4.0-56-generic, linux-image-5.4.0-1030-oracle, linux-aws-5.4,
linux-gcp-5.4, linux-image-generic-lpae-hwe-18.04, linux-image-gke,
linux-image-oracle, linux-image-generic-lpae-hwe-20.04,
linux-image-raspi-hwe-18.04, linux-kvm, linux-image-lowlatency-hwe-20.04,
linux-image-virtual-hwe-20.04, linux-image-gcp, linux-image-generic,
linux-image-generic-lpae, linux-azure, linux-azure-5.4,
linux-image-5.4.0-56-lowlatency, linux-aws, linux-image-generic-hwe-18.04,
linux-hwe-5.4, linux-oracle, linux-image-virtual, linux-raspi,
linux-image-5.4.0-1023-raspi, linux-raspi-5.4,
linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1030-aws,
linux-image-5.4.0-1030-gcp, linux-image-5.4.0-1032-azure, linux,
linux-image-lowlatency, linux-image-oem, linux-image-raspi,
linux-image-aws, linux-gcp
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