Ubuntu Security Notices USN-8646-1 USN-8646-1: Linux kernel vulnerabilities Publication date 18 August 2026 Overview Several security issues were fixed in the Linux kernel. Releases 14.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Related notices Packages linux - Linux 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: OCFS2 file system; B.A.T.M.A.N. meshing protocol; Netfilter; SCTP protocol 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: OCFS2 file system; B.A.T.M.A.N. meshing protocol; Netfilter; 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. 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 14.04 LTS trusty linux-image-3.13.0-217-generic – 3.13.0-217.268 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-3.13.0-217-lowlatency – 3.13.0-217.268 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-generic – 3.13.0.217.227 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-generic-lts-trusty – 3.13.0.217.227 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-lowlatency – 3.13.0.217.227 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-server – 3.13.0.217.227 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-virtual – 3.13.0.217.227 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. 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 References CVE-2026-53309 CVE-2026-53246 CVE-2026-53224 CVE-2026-53043 CVE-2026-53002 CVE-2026-52914 CVE-2026-53309 CVE-2026-53246 CVE-2026-53224 CVE-2026-53043 CVE-2026-53002 CVE-2026-52914 Related notices Search id="usn" Close Search USN-8645-1 USN-8644-1 USN-8643-1 USN-8637-1 USN-8635-1 USN-8633-1 USN-8633-2 USN-8630-1 USN-8630-2 USN-8629-1 USN-8645-1 USN-8644-1 USN-8643-1 USN-8637-1 USN-8635-1 USN-8633-1 USN-8633-2 USN-8630-1 USN-8630-2 USN-8629-1 USN-8629-2 USN-8620-1 USN-8620-2 USN-8620-3 USN-8620-4 USN-8619-1 USN-8618-1 USN-8610-1 USN-8609-1 USN-8608-1 USN-8607-1 USN-8606-1 USN-8603-1 USN-8596-1 USN-8595-1 USN-8595-2 USN-8595-3 USN-8593-1 USN-8576-1 USN-8576-2 USN-8575-1 USN-8575-2 USN-8575-3 USN-8574-1 USN-8574-2 USN-8574-3 USN-8569-1 USN-8568-1 USN-8567-1 USN-8566-1 Show 30 more references Show less references Have additional questions? Talk to a member of the team ›