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Ubuntu 20.04 18.04 Critical Linux Kernel Escalation Issues USN-8280-2

Several security issues were fixed in the Linux kernel.. ========================================================================== Ubuntu Security Notice USN-8280-2 May 22, 2026 linux-azure, linux-azure-5.4, linux-azure-fips vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS - linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems Details: It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-31431) 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; - Packet sockets; - TLS protocol; (CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS linux-image-5.4.0-1163-azure 5.4.0-1163.169 Available with Ubuntu Pro linux-image-5.4.0-1163-azure-fips 5.4.0-1163.169+fips1 Available with Ubuntu Pro linux-image-azure-5.4 5.4.0.1163.155 Available with Ubuntu Pro linux-image-azure-fips 5.4.0.1163.99 Available with Ubuntu Pro linux-image-azure-fips-5.4 5.4.0.1163.99 Available with Ubuntu Pro linux-image-azure-lts-20.04 5.4.0.1163.155 Available with Ubuntu Pro Ubuntu 18.04 LTS linux-image-5.4.0-1163-azure 5.4.0-1163.169~18.04.1 Available with Ubuntu Pro linux-image-azure 5.4.0.1163.169~18.04.1 Available with Ubuntu Pro linux-image-azure-5.4 5.4.0.1163.169~18.04.1 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-8280-2 https://ubuntu.com/security/notices/USN-8280-1 CVE-2026-31431, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078 . Explore the Ubuntu 20.04 and 18.04 LTS kernel updates addressing severe security issues.. Ubuntu security updates, kernel vulnerabilities, Azure Linux security, privilege escalation, security fixes. . Severity: Critical. LinuxSecurity.com Team

May 22, 2026 •Critical Ubuntu