1. Ubuntu Security Notices
  2. USN-4313-1

USN-4313-1: Linux kernel vulnerability

Publication date

30 March 2020

Overview

The system could be made to expose sensitive information or run programs as an administrator.

Releases

Packages

Details

Manfred Paul discovered that the bpf verifier in the Linux kernel did not
properly calculate register bounds for certain operations. A local attacker
could use this to expose sensitive information (kernel memory) or gain
administrative privileges.

Manfred Paul discovered that the bpf verifier in the Linux kernel did not
properly calculate register bounds for certain operations. A local attacker
could use this to expose sensitive information (kernel memory) or gain
administrative privileges.

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
19.10 eoan linux-image-5.3.0-1013-oracle –  5.3.0-1013.14
linux-image-5.3.0-1014-kvm –  5.3.0-1014.15
linux-image-5.3.0-1015-aws –  5.3.0-1015.16
linux-image-5.3.0-1016-gcp –  5.3.0-1016.17
linux-image-5.3.0-1018-azure –  5.3.0-1018.19
linux-image-5.3.0-1021-raspi2 –  5.3.0-1021.23
linux-image-5.3.0-45-generic –  5.3.0-45.37
linux-image-5.3.0-45-generic-lpae –  5.3.0-45.37
linux-image-5.3.0-45-lowlatency –  5.3.0-45.37
linux-image-5.3.0-45-snapdragon –  5.3.0-45.37
linux-image-aws –  5.3.0.1015.17
linux-image-azure –  5.3.0.1018.37
linux-image-gcp –  5.3.0.1016.17
linux-image-generic –  5.3.0.45.38
linux-image-generic-lpae –  5.3.0.45.38
linux-image-gke –  5.3.0.1016.17
linux-image-kvm –  5.3.0.1014.16
linux-image-lowlatency –  5.3.0.45.38
linux-image-oracle –  5.3.0.1013.14
linux-image-raspi2 –  5.3.0.1021.18
linux-image-snapdragon –  5.3.0.45.38
linux-image-virtual –  5.3.0.45.38
18.04 bionic linux-image-5.3.0-1013-oracle –  5.3.0-1013.14~18.04.1
linux-image-5.3.0-1016-gcp –  5.3.0-1016.17~18.04.1
linux-image-5.3.0-1016-gke –  5.3.0-1016.17~18.04.1
linux-image-5.3.0-1018-azure –  5.3.0-1018.19~18.04.1
linux-image-5.3.0-1021-raspi2 –  5.3.0-1021.23~18.04.1
linux-image-5.3.0-45-generic –  5.3.0-45.37~18.04.1
linux-image-5.3.0-45-generic-lpae –  5.3.0-45.37~18.04.1
linux-image-5.3.0-45-lowlatency –  5.3.0-45.37~18.04.1
linux-image-azure-edge –  5.3.0.1018.18
linux-image-gcp-edge –  5.3.0.1016.15
linux-image-generic-hwe-18.04 –  5.3.0.45.101
linux-image-generic-lpae-hwe-18.04 –  5.3.0.45.101
linux-image-gke-5.3 –  5.3.0.1016.6
linux-image-lowlatency-hwe-18.04 –  5.3.0.45.101
linux-image-oracle-edge –  5.3.0.1013.12
linux-image-raspi2-hwe-18.04 –  5.3.0.1021.10
linux-image-snapdragon-hwe-18.04 –  5.3.0.45.101
linux-image-virtual-hwe-18.04 –  5.3.0.45.101

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References

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