========================================================================== Ubuntu Security Notice USN-8266-1 May 11, 2026 linux, linux-aws, linux-aws-fips, linux-aws-hwe, linux-azure-4.15, linux-fips, linux-gcp, linux-gcp-4.15, linux-gcp-fips, linux-hwe, linux-kvm, linux-oracle vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS - linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems - linux-fips: Linux kernel with FIPS - linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems - linux-gcp-fips: Linux kernel for Google Cloud Platform (GCP) systems with FIPS - linux-kvm: Linux kernel for cloud environments - linux-oracle: Linux kernel for Oracle Cloud systems - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe: Linux hardware enablement (HWE) kernel Details: Qualys discovered that several vulnerabilities existed in the AppArmor Linux kernel Security Module (LSM). An unprivileged local attacker could use these issues to load, replace, and remove arbitrary AppArmor profiles causing denial of service, exposure of sensitive information (kernel memory), local privilege escalation, or possibly escape a container. (LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403, CVE-2026-23404, CVE-2026-23405, CVE-2026-23410, CVE-2026-23411) 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: - GPU drivers; - Network drivers; - Sun RPC protocol; - XFRM subsystem; (CVE-2024-27388, CVE-2024-46816, CVE-2024-49938, CVE-2024-50008, CVE-2024-50142, CVE-2026-23209) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS linux-image-4.15.0-1146-fips 4.15.0-1146.158 Available with Ubuntu Pro linux-image-4.15.0-1153-oracle 4.15.0-1153.164 Available with Ubuntu Pro linux-image-4.15.0-1173-kvm 4.15.0-1173.178 Available with Ubuntu Pro linux-image-4.15.0-1184-gcp 4.15.0-1184.201 Available with Ubuntu Pro linux-image-4.15.0-1191-aws 4.15.0-1191.204 Available with Ubuntu Pro linux-image-4.15.0-1200-azure 4.15.0-1200.215 Available with Ubuntu Pro linux-image-4.15.0-2092-gcp-fips 4.15.0-2092.98 Available with Ubuntu Pro linux-image-4.15.0-2129-aws-fips 4.15.0-2129.135 Available with Ubuntu Pro linux-image-4.15.0-249-generic 4.15.0-249.261 Available with Ubuntu Pro linux-image-4.15.0-249-lowlatency 4.15.0-249.261 Available with Ubuntu Pro linux-image-aws-4.15 4.15.0.1191.189 Available with Ubuntu Pro linux-image-aws-fips 4.15.0.2129.123 Available with Ubuntu Pro linux-image-aws-fips-4.15 4.15.0.2129.123 Available with Ubuntu Pro linux-image-aws-lts-18.04 4.15.0.1191.189 Available with Ubuntu Pro linux-image-azure-4.15 4.15.0.1200.168 Available with Ubuntu Pro linux-image-azure-lts-18.04 4.15.0.1200.168 Available with Ubuntu Pro linux-image-fips 4.15.0.1146.143 Available with Ubuntu Pro linux-image-gcp-4.15 4.15.0.1184.197 Available with Ubuntu Pro linux-image-gcp-fips 4.15.0.2092.90 Available with Ubuntu Pro linux-image-gcp-fips-4.15 4.15.0.2092.90 Available with Ubuntu Pro linux-image-gcp-lts-18.04 4.15.0.1184.197 Available with Ubuntu Pro linux-image-generic 4.15.0.249.233 Available with Ubuntu Pro linux-image-kvm 4.15.0.1173.164 Available with Ubuntu Pro linux-image-lowlatency 4.15.0.249.233 Available with Ubuntu Pro linux-image-oracle-4.15 4.15.0.1153.158 Available with Ubuntu Pro linux-image-oracle-lts-18.04 4.15.0.1153.158 Available with Ubuntu Pro linux-image-virtual 4.15.0.249.233 Available with Ubuntu Pro Ubuntu 16.04 LTS linux-image-4.15.0-1184-gcp 4.15.0-1184.201~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-1191-aws 4.15.0-1191.204~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-249-generic 4.15.0-249.261~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-249-lowlatency 4.15.0-249.261~16.04.1 Available with Ubuntu Pro linux-image-aws-hwe 4.15.0.1191.204~16.04.1 Available with Ubuntu Pro linux-image-gcp 4.15.0.1184.201~16.04.1 Available with Ubuntu Pro linux-image-generic-hwe-16.04 4.15.0.249.261~16.04.1 Available with Ubuntu Pro linux-image-gke 4.15.0.1184.201~16.04.1 Available with Ubuntu Pro linux-image-lowlatency-hwe-16.04 4.15.0.249.261~16.04.1 Available with Ubuntu Pro linux-image-oem 4.15.0.249.261~16.04.1 Available with Ubuntu Pro linux-image-virtual-hwe-16.04 4.15.0.249.261~16.04.1 Available with Ubuntu Pro After a standard system update you need to reboot your computer to make all the necessary changes. 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. References: https://ubuntu.com/security/notices/USN-8266-1 https://launchpad.net/bugs/2143853 CVE-2024-27388, CVE-2024-46816, CVE-2024-49938, CVE-2024-50008, CVE-2024-50142, CVE-2026-23209, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403, CVE-2026-23404, CVE-2026-23405, CVE-2026-23410, CVE-2026-23411
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