USN-4462-1: Linux kernel vulnerability

Releases

• Ubuntu 18.04 ESM

Packages

• linux-gke-5.0 - Linux kernel for Google Container Engine (GKE) systems
• linux-oem-osp1 - Linux kernel for OEM systems

Details

It was discovered that the bcache subsystem in the Linux kernel did not
properly release a lock in some error conditions. A local attacker could
possibly use this to cause a denial of service.

Update instructions

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

Ubuntu 18.04

• linux-image-5.0.0-1046-gke - 5.0.0-1046.47
• linux-image-5.0.0-1067-oem-osp1 - 5.0.0-1067.72
• linux-image-gke-5.0 - 5.0.0.1046.31
• linux-image-oem-osp1 - 5.0.0.1067.65

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

• CVE-2020-12771

Related notices

• USN-4463-1: linux-image-kvm, linux-image-lowlatency-lts-vivid, linux-aws, linux-image-4.4.0-1137-raspi2, linux-image-aws, linux-image-generic-lts-vivid, linux-image-powerpc-smp, linux-image-4.4.0-187-generic-lpae, linux-image-powerpc64-emb-lts-wily, linux-image-virtual, linux-image-virtual-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1078-kvm, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-wily, linux-image-4.4.0-187-lowlatency, linux-image-4.4.0-187-powerpc-smp, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-kvm, linux-image-powerpc64-smp-lts-vivid, linux-image-lowlatency, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lts-xenial, linux-raspi2, linux, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-raspi2, linux-image-4.4.0-1112-aws, linux-image-powerpc-e500mc-lts-wily, linux-image-snapdragon, linux-lts-xenial, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-187-powerpc64-emb, linux-image-generic-lpae, linux-image-4.4.0-1141-snapdragon, linux-image-4.4.0-1076-aws, linux-image-generic-lts-utopic, linux-image-4.4.0-187-generic, linux-image-generic, linux-image-virtual-lts-wily, linux-image-virtual-lts-xenial, linux-image-powerpc64-emb, linux-snapdragon, linux-image-4.4.0-187-powerpc-e500mc, linux-image-powerpc64-smp-lts-utopic, linux-image-virtual-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc, linux-image-powerpc64-smp, linux-image-4.4.0-187-powerpc64-smp, linux-image-powerpc64-emb-lts-xenial, linux-image-generic-lts-wily, linux-image-generic-lpae-lts-xenial
• USN-4465-1: linux-image-5.3.0-1033-aws, linux-azure-5.3, linux-hwe, linux-gke-5.3, linux-aws-5.3, linux-image-5.3.0-1035-azure, linux-image-5.3.0-65-lowlatency, linux-image-aws, linux-image-5.3.0-1033-gke, linux-image-azure, linux-image-gkeop-5.3, linux-image-gke-5.3, linux-image-5.3.0-65-generic
• USN-4483-1: linux-image-azure-edge, linux-image-generic-lpae-hwe-18.04, linux-image-kvm, linux-image-gkeop-5.4, linux-image-oracle-edge, linux-aws, linux-image-snapdragon-hwe-18.04-edge, linux-oracle-5.4, linux-image-aws, linux-image-virtual, linux-image-azure, linux-image-gcp, linux-image-5.4.0-1023-azure, linux-image-generic-lpae-hwe-18.04-edge, linux-oracle, linux-image-5.4.0-45-generic, linux-image-5.4.0-1016-raspi, linux-image-raspi2-hwe-18.04, linux-image-raspi-hwe-18.04, linux-image-lowlatency-hwe-18.04-edge, linux-image-gcp-edge, linux-image-5.4.0-45-lowlatency, linux-hwe-5.4, linux-azure-5.4, linux-image-5.4.0-45-generic-lpae, linux-image-gke, linux-image-oem, linux-image-virtual-hwe-20.04, linux-image-lowlatency, linux-image-5.4.0-1022-gcp, linux-kvm, linux-raspi, linux-image-raspi2-hwe-18.04-edge, linux, linux-image-5.4.0-1022-oracle, linux-image-raspi2, linux-gcp, linux-image-oem-osp1, linux-image-generic-hwe-18.04, linux-image-raspi, linux-image-generic-lpae, linux-gcp-5.4, linux-image-5.4.0-1022-aws, linux-image-generic-hwe-18.04-edge, linux-image-generic-hwe-20.04, linux-image-lowlatency-hwe-18.04, linux-image-lowlatency-hwe-20.04, linux-image-generic, linux-image-aws-edge, linux-image-snapdragon-hwe-18.04, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-image-virtual-hwe-18.04, linux-image-gke-5.4, linux-image-raspi-hwe-18.04-edge, linux-azure, linux-raspi-5.4, linux-aws-5.4, linux-image-virtual-hwe-18.04-edge
• USN-4485-1: linux-image-azure-edge, linux-gcp-4.15, linux-image-kvm, linux-aws, linux-image-4.15.0-115-generic-lpae, linux-image-4.15.0-1081-gcp, linux-image-generic-lpae-hwe-16.04, linux-image-virtual, linux-image-azure, linux-image-gcp, linux-oracle, linux-azure-4.15, linux-hwe, linux-image-lowlatency-hwe-16.04-edge, linux-image-gke, linux-image-oem, linux-aws-hwe, linux-image-lowlatency, linux-image-virtual-hwe-16.04-edge, linux-kvm, linux-gke-4.15, linux-image-generic-hwe-16.04-edge, linux-raspi2, linux, linux-image-4.15.0-1094-oem, linux-image-4.15.0-1067-gke, linux-image-raspi2, linux-gcp, linux-image-4.15.0-115-lowlatency, linux-image-generic-lpae-hwe-16.04-edge, linux-image-aws-lts-18.04, linux-image-snapdragon, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1051-oracle, linux-image-4.15.0-115-generic, linux-image-4.15.0-1093-azure, linux-image-gcp-lts-18.04, linux-image-generic-hwe-16.04, linux-image-generic-lpae, linux-image-lowlatency-hwe-16.04, linux-image-oracle-lts-18.04, linux-image-4.15.0-1072-kvm, linux-image-aws-hwe, linux-image-generic, linux-snapdragon, linux-image-oracle, linux-oem, linux-image-4.15.0-1084-snapdragon, linux-image-gke-4.15, linux-azure, linux-image-azure-lts-18.04, linux-image-4.15.0-1080-aws, linux-image-4.15.0-1068-raspi2