--- title: 'USN-8643-2: Linux kernel vulnerabilities | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-8643-2 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-8643-2 --- # USN-8643-2: Linux kernel vulnerabilities Publication date 20 August 2026 Overview Several security issues were fixed in the Linux kernel. Releases [24.04 LTS](https://ubuntu.com/security/notices?release=noble) [22.04 LTS](https://ubuntu.com/security/notices?release=jammy) --- Open side navigation ## Packages * [linux-gke](https://ubuntu.com/security/cves?package=linux-gke) - Linux kernel for Google Container Engine (GKE) systems * [linux-lowlatency](https://ubuntu.com/security/cves?package=linux-lowlatency) - Linux low latency kernel * [linux-lowlatency-hwe-6.8](https://ubuntu.com/security/cves?package=linux-lowlatency-hwe-6.8) - Linux low latency kernel ## Details Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: * Network drivers; * Open vSwitch; * SCTP protocol ## 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.](https://ubuntu.com/security/cves/about#security) 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 | | --- | --- | | 24.04 LTS noble | [linux-image-6.8.0-1061-gke](https://launchpad.net/ubuntu/+source/linux-signed-gke) –  [6.8.0-1061.69](https://launchpad.net/ubuntu/+source/linux-signed-gke/6.8.0-1061.69) | | | | [linux-image-6.8.0-1061-gke-64k](https://launchpad.net/ubuntu/+source/linux-signed-gke) –  [6.8.0-1061.69](https://launchpad.net/ubuntu/+source/linux-signed-gke/6.8.0-1061.69) | | | | [linux-image-6.8.0-138-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency) –  [6.8.0-138.138.1](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency/6.8.0-138.138.1) | | | | [linux-image-6.8.0-138-lowlatency-64k](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency) –  [6.8.0-138.138.1](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency/6.8.0-138.138.1) | | | | [linux-image-gke](https://launchpad.net/ubuntu/+source/linux-meta-gke) –  [6.8.0-1061.69](https://launchpad.net/ubuntu/+source/linux-meta-gke/6.8.0-1061.69) | | | | [linux-image-gke-6.8](https://launchpad.net/ubuntu/+source/linux-meta-gke) –  [6.8.0-1061.69](https://launchpad.net/ubuntu/+source/linux-meta-gke/6.8.0-1061.69) | | | | [linux-image-gke-64k](https://launchpad.net/ubuntu/+source/linux-meta-gke) –  [6.8.0-1061.69](https://launchpad.net/ubuntu/+source/linux-meta-gke/6.8.0-1061.69) | | | | [linux-image-gke-64k-6.8](https://launchpad.net/ubuntu/+source/linux-meta-gke) –  [6.8.0-1061.69](https://launchpad.net/ubuntu/+source/linux-meta-gke/6.8.0-1061.69) | | | | [linux-image-lowlatency](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency) –  [6.8.0-138.138.1](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency/6.8.0-138.138.1) | | | | [linux-image-lowlatency-6.8](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency) –  [6.8.0-138.138.1](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency/6.8.0-138.138.1) | | | | [linux-image-lowlatency-64k](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency) –  [6.8.0-138.138.1](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency/6.8.0-138.138.1) | | | | [linux-image-lowlatency-64k-6.8](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency) –  [6.8.0-138.138.1](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency/6.8.0-138.138.1) | | | | 22.04 LTS jammy | [linux-image-6.8.0-138-lowlatency](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency-hwe-6.8) –  [6.8.0-138.138.1~22.04.1](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency-hwe-6.8/6.8.0-138.138.1~22.04.1) | | | | [linux-image-6.8.0-138-lowlatency-64k](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency-hwe-6.8) –  [6.8.0-138.138.1~22.04.1](https://launchpad.net/ubuntu/+source/linux-signed-lowlatency-hwe-6.8/6.8.0-138.138.1~22.04.1) | | | | [linux-image-lowlatency-6.8](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.8) –  [6.8.0-138.138.1~22.04.1](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.8/6.8.0-138.138.1~22.04.1) | | | | [linux-image-lowlatency-64k-6.8](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.8) –  [6.8.0-138.138.1~22.04.1](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.8/6.8.0-138.138.1~22.04.1) | | | | [linux-image-lowlatency-64k-hwe-22.04](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.8) –  [6.8.0-138.138.1~22.04.1](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.8/6.8.0-138.138.1~22.04.1) | | | | [linux-image-lowlatency-hwe-22.04](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.8) –  [6.8.0-138.138.1~22.04.1](https://launchpad.net/ubuntu/+source/linux-meta-lowlatency-hwe-6.8/6.8.0-138.138.1~22.04.1) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2026-64531](https://ubuntu.com/security/CVE-2026-64531) * [CVE-2026-53247](https://ubuntu.com/security/CVE-2026-53247) * [CVE-2026-53246](https://ubuntu.com/security/CVE-2026-53246) * [CVE-2026-53224](https://ubuntu.com/security/CVE-2026-53224) ## Related notices id="usn" *Search* * [USN-8911-1](https://ubuntu.com/security/notices/USN-8911-1) * [USN-8850-1](https://ubuntu.com/security/notices/USN-8850-1) * [USN-8800-1](https://ubuntu.com/security/notices/USN-8800-1) * [USN-8760-1](https://ubuntu.com/security/notices/USN-8760-1) * [USN-8760-2](https://ubuntu.com/security/notices/USN-8760-2) * [USN-8748-1](https://ubuntu.com/security/notices/USN-8748-1) * [USN-8728-1](https://ubuntu.com/security/notices/USN-8728-1) * [USN-8728-2](https://ubuntu.com/security/notices/USN-8728-2) * [USN-8728-3](https://ubuntu.com/security/notices/USN-8728-3) * [USN-8725-1](https://ubuntu.com/security/notices/USN-8725-1) --- Show 37 more references --- Have additional questions? 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