Ubuntu Security Notices USN-8143-1 USN-8143-1: Linux kernel vulnerabilities Publication date 1 April 2026 Overview Several security issues were fixed in the Linux kernel. Releases 16.04 LTS 14.04 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 linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty 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: Cryptographic API; GPU drivers; BTRFS file system; GFS2 file system; UDF file system; NFC subsystem; Network traffic control 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: Cryptographic API; GPU drivers; BTRFS file system; GFS2 file system; UDF file system; NFC subsystem; Network traffic control 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-4.4.0-1154-kvm – 4.4.0-1154.165 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.4.0-1191-aws – 4.4.0-1191.206 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.4.0-279-generic – 4.4.0-279.313 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.4.0-279-lowlatency – 4.4.0-279.313 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws – 4.4.0.1191.195 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic – 4.4.0.279.285 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic-lts-xenial – 4.4.0.279.285 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-kvm – 4.4.0.1154.151 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency – 4.4.0.279.285 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency-lts-xenial – 4.4.0.279.285 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual – 4.4.0.279.285 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual-lts-xenial – 4.4.0.279.285 Ubuntu Pro Fix available with Ubuntu Pro . 14.04 LTS trusty linux-image-4.4.0-1153-aws – 4.4.0-1153.159 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-4.4.0-279-generic – 4.4.0-279.313~14.04.1+1 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-4.4.0-279-lowlatency – 4.4.0-279.313~14.04.1+1 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-aws – 4.4.0.1153.150 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-generic-lts-xenial – 4.4.0.279.313~14.04.1 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-lowlatency-lts-xenial – 4.4.0.279.313~14.04.1 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. linux-image-virtual-lts-xenial – 4.4.0.279.313~14.04.1 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. 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Get Ubuntu Pro References CVE-2026-23074 CVE-2026-23060 CVE-2025-21735 CVE-2024-46777 CVE-2021-47254 CVE-2021-47145 CVE-2021-47142 CVE-2026-23074 CVE-2026-23060 CVE-2025-21735 CVE-2024-46777 CVE-2021-47254 CVE-2021-47145 CVE-2021-47142 Related notices Search id="usn" Close Search USN-8142-1 USN-7737-1 USN-7653-1 USN-7652-1 USN-7651-1 USN-7651-2 USN-7651-3 USN-7651-4 USN-7651-5 USN-7651-6 USN-8142-1 USN-7737-1 USN-7653-1 USN-7652-1 USN-7651-1 USN-7651-2 USN-7651-3 USN-7651-4 USN-7651-5 USN-7651-6 USN-7640-1 USN-7602-1 USN-7593-1 USN-7540-1 USN-7539-1 USN-7521-1 USN-7521-2 USN-7521-3 USN-7518-1 USN-7517-1 USN-7517-2 USN-7517-3 USN-7516-1 USN-7516-2 USN-7516-3 USN-7516-4 USN-7516-5 USN-7516-6 USN-7516-7 USN-7516-9 USN-7516-8 USN-7512-1 USN-7511-1 USN-7511-2 USN-7511-3 USN-7510-1 USN-7510-2 USN-7510-3 USN-7510-4 USN-7510-5 USN-7510-6 USN-7510-7 USN-7510-8 USN-7196-1 USN-7194-1 USN-7156-1 USN-7155-1 USN-7154-1 USN-7154-2 USN-7144-1 USN-7123-1 USN-7119-1 USN-7100-1 USN-7100-2 USN-7088-1 USN-7088-2 USN-7088-3 USN-7088-4 USN-7088-5 Show 49 more references Show less references Have additional questions? 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