USN-4683-1: Linux kernel (OEM) vulnerability

07 January 2021

The system could be made to crash or expose sensitive information under certain conditions.

Releases

Packages

  • linux-oem-5.6 - Linux kernel for OEM systems

Details

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).

Update instructions

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

Ubuntu 20.04

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.

References

Related notices

  • USN-4679-1: linux-aws, linux-image-5.4.0-1033-gke, linux-image-5.4.0-1031-kvm, linux-oracle-5.4, linux-image-raspi2, linux-image-generic-hwe-18.04, linux-image-5.4.0-59-generic, linux, linux-image-5.4.0-1026-raspi, linux-image-raspi-hwe-18.04, linux-kvm, linux-image-5.4.0-1034-oracle, linux-gcp, linux-image-5.4.0-59-generic-lpae, linux-image-5.4.0-59-lowlatency, linux-image-gke-5.4, linux-image-azure, linux-image-generic, linux-image-lowlatency-hwe-18.04, linux-image-oracle, linux-image-raspi, linux-azure-5.4, linux-image-virtual-hwe-18.04, linux-azure, linux-image-5.4.0-1033-gcp, linux-hwe-5.4, linux-image-5.4.0-1035-azure, linux-oracle, linux-image-generic-lpae-hwe-18.04, linux-image-kvm, linux-image-snapdragon-hwe-18.04, linux-image-generic-lpae, linux-image-oem, linux-image-5.4.0-1034-aws, linux-image-aws, linux-image-gcp, linux-gke-5.4, linux-image-oem-osp1, linux-image-lowlatency, linux-image-virtual, linux-raspi, linux-raspi-5.4, linux-gcp-5.4, linux-aws-5.4
  • USN-4680-1: linux-aws, linux-image-4.15.0-1077-raspi2, linux-hwe, linux-image-4.15.0-1062-oracle, linux-image-oracle-lts-18.04, linux-image-aws-lts-18.04, linux-image-4.15.0-1091-aws, linux-image-raspi2, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-1091-gcp, linux, linux-kvm, linux-image-powerpc-smp, linux-image-generic-hwe-16.04, linux-image-4.15.0-1082-kvm, linux-gcp, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1103-azure, linux-image-azure, linux-image-powerpc64-smp, linux-image-4.15.0-129-generic-lpae, linux-image-generic, linux-image-oracle, linux-image-powerpc64-emb, linux-image-4.15.0-1077-gke, linux-image-gcp-lts-18.04, linux-image-4.15.0-129-lowlatency, linux-image-azure-lts-18.04, linux-image-gke-4.15, linux-azure, linux-image-4.15.0-129-generic, linux-oracle, linux-gcp-4.15, linux-image-aws-hwe, linux-image-kvm, linux-image-gke, linux-gke-4.15, linux-image-generic-lpae, linux-snapdragon, linux-image-generic-lpae-hwe-16.04, linux-aws-hwe, linux-image-oem, linux-image-gcp, linux-image-snapdragon, linux-image-virtual, linux-image-lowlatency, linux-raspi2, linux-image-4.15.0-1094-snapdragon, linux-azure-4.15, linux-image-powerpc-e500mc
  • USN-4681-1: linux-image-4.4.0-198-powerpc64-smp, linux-aws, linux-image-4.4.0-198-powerpc-smp, linux-image-4.4.0-1083-aws, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-198-powerpc64-emb, linux-image-raspi2, linux, linux-kvm, linux-image-powerpc-smp, linux-image-4.4.0-198-generic-lpae, linux-image-4.4.0-198-generic, linux-image-4.4.0-1085-kvm, linux-image-powerpc64-smp, linux-image-generic, linux-image-powerpc64-emb, linux-image-4.4.0-1119-aws, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-1143-raspi2, linux-image-generic-lts-xenial, linux-image-kvm, linux-image-generic-lpae-lts-xenial, linux-image-generic-lpae, linux-snapdragon, linux-image-virtual-lts-xenial, linux-image-4.4.0-1147-snapdragon, linux-image-aws, linux-image-snapdragon, linux-image-virtual, linux-image-lowlatency, linux-raspi2, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-198-powerpc-e500mc, linux-image-4.4.0-198-lowlatency, linux-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc