USN-4343-1: Linux kernel vulnerability

Releases

• Ubuntu 20.04 LTS

Packages

• linux - Linux kernel

Details

Al Viro discovered that the Linux kernel for s390x systems did not properly
perform page table upgrades for kernel sections that use secondary address
mode. A local attacker could use this to cause a denial of service (system
crash) or execute arbitrary code.

Update instructions

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

Ubuntu 20.04

• linux-image-5.4.0-28-generic - 5.4.0-28.32
• linux-image-5.4.0-28-generic-lpae - 5.4.0-28.32
• linux-image-5.4.0-28-lowlatency - 5.4.0-28.32
• linux-image-generic - 5.4.0.28.33
• linux-image-generic-lpae - 5.4.0.28.33
• linux-image-lowlatency - 5.4.0.28.33
• linux-image-oem - 5.4.0.28.33
• linux-image-oem-osp1 - 5.4.0.28.33
• linux-image-virtual - 5.4.0.28.33

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-2020-11884

Related notices

• USN-4345-1: linux-image-lowlatency-hwe-16.04-edge, linux-image-oracle-lts-18.04, linux-image-4.15.0-1061-raspi2, linux-image-gcp, linux-image-4.15.0-1059-kvm, linux-snapdragon, linux-image-gke, linux-image-4.15.0-1066-aws, linux-image-4.15.0-1061-gcp, linux, linux-image-lowlatency, linux-image-4.15.0-1082-azure, linux-image-azure, linux-image-virtual-hwe-16.04-edge, linux-kvm, linux-image-azure-edge, linux-oracle, linux-image-4.15.0-1080-oem, linux-image-4.15.0-1038-oracle, linux-image-4.15.0-99-generic-lpae, linux-image-generic, linux-image-virtual-hwe-16.04, linux-image-aws-hwe, linux-image-generic-lpae, linux-image-oem, linux-image-generic-lpae-hwe-16.04, linux-azure, linux-image-snapdragon, linux-image-aws-lts-18.04, linux-image-lowlatency-hwe-16.04, linux-image-generic-hwe-16.04, linux-oem, linux-aws-hwe, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-image-4.15.0-1077-snapdragon, linux-gke-4.15, linux-aws, linux-image-4.15.0-1058-gke, linux-image-generic-lpae-hwe-16.04-edge, linux-image-4.15.0-99-generic, linux-image-oracle, linux-hwe, linux-raspi2, linux-image-generic-hwe-16.04-edge, linux-image-virtual, linux-image-gke-4.15, linux-image-4.15.0-99-lowlatency
• USN-4342-1: linux-image-gcp, linux-azure-5.3, linux-image-gke, linux-image-gke-5.3, linux-image-snapdragon-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04, linux-image-5.3.0-1023-raspi2, linux-image-generic-hwe-18.04-edge, linux-image-5.3.0-51-lowlatency, linux-image-raspi2-hwe-18.04, linux-image-5.3.0-1018-gke, linux, linux-image-lowlatency, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.3.0-1017-aws, linux-image-azure, linux-oracle-5.3, linux-image-lowlatency-hwe-18.04, linux-image-azure-edge, linux-image-virtual-hwe-18.04-edge, linux-oracle, linux-image-generic, linux-image-virtual-hwe-18.04, linux-image-generic-lpae, linux-azure, linux-gcp-5.3, linux-gke-5.3, linux-image-5.3.0-1016-oracle, linux-image-snapdragon, linux-image-5.3.0-1020-azure, linux-raspi2-5.3, linux-image-aws, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-aws, linux-image-5.3.0-51-generic, linux-image-generic-hwe-18.04, linux-image-5.3.0-1016-kvm, linux-image-5.3.0-1018-gcp, linux-image-oracle, linux-hwe, linux-image-generic-lpae-hwe-18.04, linux-image-gcp-edge, linux-raspi2, linux-image-5.3.0-51-snapdragon, linux-image-virtual, linux-image-generic-lpae-hwe-18.04-edge, linux-kvm, linux-image-oracle-edge, linux-image-5.3.0-51-generic-lpae