1. Ubuntu Security Notices
  2. USN-5002-1

USN-5002-1: Linux kernel (HWE) vulnerability

Publication date

23 June 2021

Overview

The system could be made to run programs as an administrator.

Releases

Packages

Details

Norbert Slusarek discovered a race condition in the CAN BCM networking
protocol of the Linux kernel leading to multiple use-after-free
vulnerabilities. A local attacker could use this issue to execute arbitrary
code.

Norbert Slusarek discovered a race condition in the CAN BCM networking
protocol of the Linux kernel leading to multiple use-after-free
vulnerabilities. A local attacker could use this issue to execute arbitrary
code.

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
18.04 bionic linux-image-gkeop-5.3 –  5.3.0.75.132
linux-image-gke-5.3 –  5.3.0.1044.27
linux-image-5.3.0-1044-gke –  5.3.0-1044.47
linux-image-5.3.0-1041-raspi2 –  5.3.0-1041.43
linux-image-5.3.0-75-lowlatency –  5.3.0-75.71
linux-image-5.3.0-75-generic –  5.3.0-75.71
linux-image-raspi2-hwe-18.04 –  5.3.0.1041.30

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References

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