Ubuntu Security Notices USN-7990-5 USN-7990-5: Linux kernel (Azure) vulnerabilities Publication date 20 February 2026 Overview Several security issues were fixed in the Linux kernel. Releases 20.04 LTS 18.04 LTS Packages linux-azure - Linux kernel for Microsoft Azure Cloud systems linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems linux-azure-fips - Linux kernel for Microsoft Azure Cloud systems with FIPS 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; Padata parallel execution mechanism; Netfilter 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; Padata parallel execution mechanism; Netfilter 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 20.04 LTS focal linux-image-5.4.0-1157-azure – 5.4.0-1157.164 linux-image-5.4.0-1158-azure-fips – 5.4.0-1158.165+fips1 linux-image-azure-5.4 – 5.4.0.1157.151 linux-image-azure-fips – 5.4.0.1158.95 linux-image-azure-fips-5.4 – 5.4.0.1158.95 linux-image-azure-lts-20.04 – 5.4.0.1157.151 18.04 LTS bionic linux-image-5.4.0-1157-azure – 5.4.0-1157.164~18.04.1 linux-image-azure – 5.4.0.1157.164~18.04.1 linux-image-azure-5.4 – 5.4.0.1157.164~18.04.1 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-2025-40019 CVE-2025-21726 CVE-2022-49698 CVE-2025-40019 CVE-2025-21726 CVE-2022-49698 USN-8052-1 USN-8016-1 USN-8015-1 USN-8015-2 USN-8015-3 USN-8015-4 USN-8014-1 USN-8013-1 USN-8013-2 USN-8013-3 USN-8052-1 USN-8016-1 USN-8015-1 USN-8015-2 USN-8015-3 USN-8015-4 USN-8014-1 USN-8013-1 USN-8013-2 USN-8013-3 USN-8013-4 USN-7990-1 USN-7990-2 USN-7990-3 USN-7990-4 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-7602-1 USN-7593-1 USN-7521-1 USN-7521-2 USN-7521-3 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 Have additional questions? Talk to a member of the team ›