USN-4255-1: Linux kernel vulnerabilities

28 January 2020

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-oem - Linux kernel for OEM processors

Details

It was discovered that the Linux kernel did not properly clear data
structures on context switches for certain Intel graphics processors. A
local attacker could use this to expose sensitive information.
(CVE-2019-14615)

It was discovered that a race condition can lead to a use-after-free while
destroying GEM contexts in the i915 driver for the Linux kernel. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-7053)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04

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.

Related notices

  • USN-4285-1: linux-oracle-5.0, linux-image-gcp, linux-gke-5.0, linux-image-azure, linux-aws-5.0, linux-image-5.0.0-1031-gcp, linux-image-5.0.0-1025-aws, linux-image-5.0.0-1030-gke, linux-gcp, linux-image-gke-5.0, linux-image-5.0.0-1011-oracle, linux-image-5.0.0-1032-azure, linux-azure
  • USN-4284-1: linux, linux-image-snapdragon, linux-image-raspi2, linux-image-5.3.0-1012-gcp, linux-image-virtual-hwe-18.04, linux-gcp-5.3, linux-image-5.3.0-1018-raspi2, linux-azure-5.3, linux-image-oracle, linux-image-5.3.0-40-generic, linux-oracle, linux-image-5.3.0-1010-kvm, linux-image-lowlatency-hwe-18.04, linux-image-5.3.0-40-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-raspi2, linux-image-snapdragon-hwe-18.04, linux-image-virtual, linux-image-kvm, linux-kvm, linux-image-generic-hwe-18.04, linux-image-gke, linux-image-gcp-edge, linux-image-5.3.0-1011-aws, linux-image-5.3.0-40-snapdragon, linux-image-gcp, linux-image-azure, linux-raspi2-5.3, linux-image-raspi2-hwe-18.04, linux-image-5.3.0-1013-azure, linux-aws, linux-image-5.3.0-40-generic-lpae, linux-azure, linux-image-generic-lpae, linux-gcp, linux-image-5.3.0-1009-oracle, linux-image-azure-edge, linux-image-lowlatency, linux-image-aws, linux-image-generic, linux-hwe
  • USN-4287-2: linux-image-azure, linux-azure, linux-image-4.15.0-1069-azure
  • USN-4286-1: linux-snapdragon, linux-image-4.4.0-174-generic-lpae, linux, linux-image-snapdragon, linux-image-powerpc-e500mc, linux-image-raspi2, linux-image-4.4.0-174-powerpc64-smp, linux-image-4.4.0-1066-kvm, linux-image-4.4.0-174-lowlatency, linux-image-4.4.0-174-powerpc64-emb, linux-raspi2, linux-image-powerpc-smp, linux-image-virtual, linux-image-4.4.0-174-powerpc-e500mc, linux-image-kvm, linux-kvm, linux-image-4.4.0-174-generic, linux-image-4.4.0-174-powerpc-smp, linux-image-4.4.0-1129-raspi2, linux-image-4.4.0-1102-aws, linux-image-4.4.0-1133-snapdragon, linux-aws, linux-image-powerpc64-smp, linux-image-generic-lpae, linux-image-lowlatency, linux-image-powerpc64-emb, linux-image-aws, linux-image-generic
  • USN-4254-1: linux-image-4.4.0-1101-aws, linux-snapdragon, linux-image-4.4.0-173-lowlatency, linux, linux-image-snapdragon, linux-image-powerpc-e500mc, linux-image-raspi2, linux-image-4.4.0-1128-raspi2, linux-image-aws, linux-image-4.4.0-173-powerpc64-smp, linux-image-4.4.0-173-powerpc-smp, linux-image-4.4.0-1065-kvm, linux-raspi2, linux-image-powerpc-smp, linux-image-virtual, linux-image-kvm, linux-kvm, linux-image-4.4.0-173-powerpc-e500mc, linux-image-4.4.0-173-powerpc64-emb, linux-image-4.4.0-1132-snapdragon, linux-image-4.4.0-173-generic-lpae, linux-aws, linux-image-powerpc64-smp, linux-image-generic-lpae, linux-image-lowlatency, linux-image-powerpc64-emb, linux-image-4.4.0-173-generic, linux-image-generic
  • USN-4287-1: linux-snapdragon, linux-image-lowlatency-hwe-16.04, linux, linux-image-snapdragon, linux-image-generic-hwe-16.04, linux-image-powerpc-e500mc, linux-image-raspi2, linux-image-aws-lts-18.04, linux-image-oracle, linux-image-oem, linux-image-4.15.0-1060-aws, linux-oracle, linux-image-gke-4.15, linux-image-oracle-lts-18.04, linux-image-4.15.0-1072-snapdragon, linux-raspi2, linux-image-4.15.0-1055-raspi2, linux-image-powerpc-smp, linux-image-virtual, linux-image-kvm, linux-kvm, linux-image-aws-hwe, linux-image-generic-lpae-hwe-16.04, linux-image-gke, linux-image-4.15.0-1071-azure, linux-image-4.15.0-1033-oracle, linux-image-4.15.0-88-lowlatency, linux-aws-hwe, linux-image-4.15.0-1055-gcp, linux-image-4.15.0-1053-kvm, linux-image-4.15.0-88-generic-lpae, linux-image-gcp, linux-image-azure, linux-aws, linux-gke-4.15, linux-azure, linux-image-generic-lpae, linux-image-powerpc64-smp, linux-image-virtual-hwe-16.04, linux-gcp, linux-image-4.15.0-1052-gke, linux-image-lowlatency, linux-image-powerpc64-emb, linux-image-4.15.0-88-generic, linux-image-aws, linux-image-generic, linux-hwe
  • USN-4255-2: linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-1058-aws, linux-image-4.15.0-76-lowlatency, linux-image-4.15.0-76-generic-lpae, linux-image-aws-hwe, linux-image-generic-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-virtual-hwe-16.04, linux-image-4.15.0-76-generic, linux-aws-hwe, linux-image-oem, linux-hwe
  • USN-4253-1: linux-image-virtual, linux-image-5.3.0-29-snapdragon, linux, linux-aws, linux-image-5.3.0-1010-aws, linux-image-generic-lpae, linux-image-5.3.0-29-lowlatency, linux-image-5.3.0-29-generic-lpae, linux-image-lowlatency, linux-image-aws, linux-image-generic, linux-image-5.3.0-29-generic
  • USN-4286-2: linux-image-4.4.0-174-generic-lpae, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-174-powerpc64-smp, linux-image-powerpc-smp-lts-xenial, linux-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-174-lowlatency, linux-image-4.4.0-174-powerpc64-emb, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-174-powerpc-e500mc, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-174-generic, linux-image-4.4.0-174-powerpc-smp, linux-image-generic-lts-xenial, linux-image-4.4.0-1062-aws, linux-image-generic-lpae-lts-xenial, linux-aws, linux-image-aws
  • USN-4253-2: linux-image-5.3.0-28-lowlatency, linux-image-5.3.0-28-generic, linux-image-5.3.0-28-generic-lpae, linux-image-generic-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-lowlatency-hwe-18.04, linux-image-snapdragon-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-hwe
  • USN-4254-2: linux-image-4.4.0-173-lowlatency, linux-image-lowlatency-lts-xenial, linux-image-aws, linux-image-4.4.0-173-powerpc64-smp, linux-image-4.4.0-173-powerpc-smp, linux-image-powerpc-smp-lts-xenial, linux-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-1061-aws, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-173-powerpc-e500mc, linux-image-generic-lts-xenial, linux-image-4.4.0-173-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-173-generic-lpae, linux-aws, linux-image-4.4.0-173-generic