This security notice addresses multiple Linux kernel vulnerabilities, including CVE-2026-23074 (CVSS 7.8 HIGH) and CVE-2025-37849 (CVSS 7.8 HIGH), which could allow an attacker to compromise the system. Affected kernel versions span from 2.6.12.1 up to versions before 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, and 6.18.8, depending on the specific CVE and kernel series. The fixes are delivered via kernel updates for Ubuntu LTS releases, and a full system reboot along with recompilation of third-party kernel modules is required due to an ABI change.
Ubuntu Security Notices USN-8145-1 USN-8145-1: Linux kernel vulnerabilities Publication date 2 April 2026 Overview Several security issues were fixed in the Linux kernel. Releases 18.04 LTS 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-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems linux-kvm - Linux kernel for cloud environments linux-oracle - Linux kernel for Oracle Cloud systems 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: ARM64 architecture; Cryptographic API; 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: ARM64 architecture; Cryptographic API; 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 18.04 LTS bionic linux-image-4.15.0-1152-oracle – 4.15.0-1152.163 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.15.0-1172-kvm – 4.15.0-1172.177 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.15.0-1190-aws – 4.15.0-1190.203 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.15.0-248-generic – 4.15.0-248.260 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-4.15.0-248-lowlatency – 4.15.0-248.260 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws-4.15 – 4.15.0.1190.188 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws-lts-18.04 – 4.15.0.1190.188 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-generic – 4.15.0.248.232 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-kvm – 4.15.0.1172.163 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-lowlatency – 4.15.0.248.232 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oracle-4.15 – 4.15.0.1152.157 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-oracle-lts-18.04 – 4.15.0.1152.157 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-virtual – 4.15.0.248.232 Ubuntu Pro Fix available with Ubuntu Pro . 16.04 LTS xenial linux-image-4.15.0-1190-aws – 4.15.0-1190.203~16.04.1 Ubuntu Pro Fix available with Ubuntu Pro . linux-image-aws-hwe – 4.15.0.1190.203~16.04.1 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-2026-23074 CVE-2026-23060 CVE-2025-37849 CVE-2025-21735 CVE-2024-46777 CVE-2026-23074 CVE-2026-23060 CVE-2025-37849 CVE-2025-21735 CVE-2024-46777 Related notices Search id="usn" Close Search USN-8143-1 USN-8142-1 USN-8126-1 USN-8074-1 USN-8074-2 USN-8052-1 USN-8052-2 USN-8031-1 USN-8031-2 USN-8031-3 USN-8143-1 USN-8142-1 USN-8126-1 USN-8074-1 USN-8074-2 USN-8052-1 USN-8052-2 USN-8031-1 USN-8031-2 USN-8031-3 USN-8028-1 USN-8028-2 USN-8028-3 USN-8028-4 USN-8028-5 USN-8028-6 USN-8028-7 USN-8028-8 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-7594-1 USN-7594-2 USN-7594-3 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 69 more references Show less references Have additional questions? Talk to a member of the team ›