--- title: 'USN-8644-2: Linux kernel (GCP) 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-8644-2 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-8644-2 --- # USN-8644-2: Linux kernel (GCP) vulnerabilities Publication date 20 August 2026 Overview Several security issues were fixed in the Linux kernel. Releases [18.04 LTS](https://ubuntu.com/security/notices?release=bionic) [16.04 LTS](https://ubuntu.com/security/notices?release=xenial) --- Open side navigation ## Packages * [linux-gcp](https://ubuntu.com/security/cves?package=linux-gcp) - Linux kernel for Google Cloud Platform (GCP) systems * [linux-gcp-4.15](https://ubuntu.com/security/cves?package=linux-gcp-4.15) - Linux kernel for Google Cloud Platform (GCP) systems * [linux-gcp-fips](https://ubuntu.com/security/cves?package=linux-gcp-fips) - Linux kernel for Google Cloud Platform (GCP) systems with FIPS ## 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: * File systems infrastructure; * OCFS2 file system; * B.A.T.M.A.N. meshing protocol; * SCTP protocol; * TIPC 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 | | --- | --- | | 18.04 LTS bionic | [linux-image-4.15.0-1189-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp-4.15) –  4.15.0-1189.206   Ubuntu Pro | | | | [linux-image-4.15.0-2097-gcp-fips](https://launchpad.net/ubuntu/+source/linux-signed-gcp-fips) –  4.15.0-2097.103   FIPS Updates | | | | [linux-image-gcp-4.15](https://launchpad.net/ubuntu/+source/linux-meta-gcp-4.15) –  4.15.0.1189.202   Ubuntu Pro | | | | [linux-image-gcp-fips](https://launchpad.net/ubuntu/+source/linux-meta-gcp-fips) –  4.15.0.2097.95   FIPS Updates | | | | [linux-image-gcp-fips-4.15](https://launchpad.net/ubuntu/+source/linux-meta-gcp-fips) –  4.15.0.2097.95   FIPS Updates | | | | [linux-image-gcp-lts-18.04](https://launchpad.net/ubuntu/+source/linux-meta-gcp-4.15) –  4.15.0.1189.202   Ubuntu Pro | | | | 16.04 LTS xenial | [linux-image-4.15.0-1189-gcp](https://launchpad.net/ubuntu/+source/linux-signed-gcp) –  4.15.0-1189.206~16.04.1   Ubuntu Pro | | | | [linux-image-gcp](https://launchpad.net/ubuntu/+source/linux-meta-gcp) –  4.15.0.1189.206~16.04.1   Ubuntu Pro | | | | [linux-image-gke](https://launchpad.net/ubuntu/+source/linux-meta-gcp) –  4.15.0.1189.206~16.04.1   Ubuntu Pro | | | --- ### 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-2026-53309](https://ubuntu.com/security/CVE-2026-53309) * [CVE-2026-53246](https://ubuntu.com/security/CVE-2026-53246) * [CVE-2026-53224](https://ubuntu.com/security/CVE-2026-53224) * [CVE-2026-53043](https://ubuntu.com/security/CVE-2026-53043) * [CVE-2026-52993](https://ubuntu.com/security/CVE-2026-52993) * [CVE-2026-52914](https://ubuntu.com/security/CVE-2026-52914) * [CVE-2026-43071](https://ubuntu.com/security/CVE-2026-43071) ## 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-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) * [USN-8725-2](https://ubuntu.com/security/notices/USN-8725-2) * [USN-8715-1](https://ubuntu.com/security/notices/USN-8715-1) * [USN-8715-2](https://ubuntu.com/security/notices/USN-8715-2) --- Show 96 more references --- Have additional questions? [Talk to a member of the team ›](https://wiki.ubuntu.com/SecurityTeam/FAQ?_ga=2.242131138.1744859116.1742138161-1500419473.1726851136&_gl=1*161muja*_gcl_au*MzUyMTIzNjI1LjE3MzYyNDQ4NTE.#Contact)