1. Ubuntu Security Notices
  2. USN-6152-1

USN-6152-1: Linux kernel (GKE) regression

Publication date

8 June 2023

Overview

The system could suffer with performance degradation in certain conditions.

Releases

Packages

  • linux-gke - Linux kernel for Google Container Engine (GKE) systems

Details

It was discovered that NFS client's access cache implementation in the
Linux kernel caused a severe NFS performance degradation in certain
conditions. This updated makes the NFS file-access stale cache behavior
to be optional.

It was discovered that NFS client's access cache implementation in the
Linux kernel caused a severe NFS performance degradation in certain
conditions. This updated makes the NFS file-access stale cache behavior
to be optional.

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-gke –  5.15.0.1035.34
linux-image-5.15.0-1035-gke –  5.15.0-1035.40
linux-image-gke-5.15 –  5.15.0.1035.34
20.04 focal linux-image-5.4.0-1101-gke –  5.4.0-1101.108
linux-image-gke –  5.4.0.1101.106
linux-image-gke-5.4 –  5.4.0.1101.106

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References

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