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Ubuntu 22.04 LTS & 20.04 LTS USN-6152-1: NFS Performance Issues

The system could suffer with performance degradation in certain conditions.. =========================================================================Ubuntu Security Notice USN-6152-1 June 08, 2023 linux-gke regression ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: The system could suffer with performance degradation in certain conditions. Software Description: - 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. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 22.04 LTS: linux-image-5.15.0-1035-gke 5.15.0-1035.40 linux-image-gke 5.15.0.1035.34 linux-image-gke-5.15 5.15.0.1035.34 Ubuntu 20.04 LTS: 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 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: https://ubuntu.com/security/notices/USN-6152-1 https://bugs.launchpad.net/ubuntu/+source/linux-gke/+bug/2022098 Package Information: https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1035.40 https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1101.108 . An acute decline in operational efficiency within the Linux kernel pertinent to GKE platforms may impact Ubuntu distributions 22.04 and 20.04.. Linux Kernel, GKE Issues, NFS Performance, System Updates. . Severity: Critical. LinuxSecurity.com Team

Jun 08, 2023 •Critical Ubuntu