Ubuntu Security Notices USN-8361-3 USN-8361-3: Linux kernel vulnerability Publication date 17 June 2026 Overview The system could be compromised under certain conditions. Releases 16.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Related notices Packages linux - Linux kernel linux-aws - Linux kernel for Amazon Web Services (AWS) systems linux-kvm - Linux kernel for cloud environments Details A security issue was discovered in the Linux kernel. An attacker could possibly use this to compromise the system. This update corrects flaws in the following subsystem: Packet sockets A security issue was discovered in the Linux kernel. An attacker could possibly use this to compromise the system. This update corrects flaws in the following subsystem: Packet sockets 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 16.04 LTS xenial linux-image-4.4.0-1156-kvm – 4.4.0-1156.167 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.4.0-1193-aws – 4.4.0-1193.208 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.4.0-281-generic – 4.4.0-281.315 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.4.0-281-lowlatency – 4.4.0-281.315 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws – 4.4.0.1193.197 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic – 4.4.0.281.287 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic-lts-xenial – 4.4.0.281.287 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-kvm – 4.4.0.1156.153 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency – 4.4.0.281.287 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency-lts-xenial – 4.4.0.281.287 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual – 4.4.0.281.287 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual-lts-xenial – 4.4.0.281.287 Ubuntu Pro Fix available with 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 References CVE-2026-31504 CVE-2026-31504 Related notices USN-8441-1 USN-8440-1 USN-8426-1 USN-8426-2 USN-8393-1 USN-8392-1 USN-8391-1 USN-8374-1 USN-8361-1 USN-8361-2 USN-8441-1 USN-8440-1 USN-8426-1 USN-8426-2 USN-8393-1 USN-8392-1 USN-8391-1 USN-8374-1 USN-8361-1 USN-8361-2 USN-8351-1 USN-8350-1 USN-8310-1 USN-8305-1 USN-8305-2 USN-8289-1 USN-8289-2 USN-8281-1 USN-8281-2 USN-8280-1 USN-8280-2 USN-8280-3 USN-8279-1 USN-8279-2 USN-8279-3 USN-8278-1 USN-8278-2 USN-8277-1 USN-8277-2 Show 19 more references Show less references Have additional questions? Talk to a member of the team ›