1. Ubuntu Security Notices
  2. USN-5444-1

USN-5444-1: Linux kernel vulnerability

Publication date

24 May 2022

Overview

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

Releases

Packages

Details

Kyle Zeng discovered that the Network Queuing and Scheduling subsystem of
the Linux kernel did not properly perform reference counting in some
situations, leading to a use-after-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or execute
arbitrary code.

Kyle Zeng discovered that the Network Queuing and Scheduling subsystem of
the Linux kernel did not properly perform reference counting in some
situations, leading to a use-after-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or 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
22.04 jammy linux-image-oem-22.04 –  5.17.0.1006.6
linux-image-oem-22.04a –  5.17.0.1006.6
linux-image-5.17.0-1006-oem –  5.17.0-1006.6
20.04 focal linux-image-oem-20.04c –  5.14.0.1038.35
linux-image-oem-20.04b –  5.14.0.1038.35
linux-image-oem-20.04d –  5.14.0.1038.35
linux-image-oem-20.04 –  5.14.0.1038.35
linux-image-5.14.0-1038-oem –  5.14.0-1038.42

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References

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