USN-8818

USN-8818-2: Linux kernel (IBM) vulnerabilities Publication date 25 September 2026 Overview Several security issues were fixed in the Linux kernel. Releases Packages - linux-ibm-5.15 - Linux kernel for IBM cloud systems Details It was discovered that some Arm processors could complete a broadcast translation lookaside buffer (TLB) invalidation before memory writes made through the invalidated translation were globally observed. A local attacker could possibly use this to write to memory after permission to do so had been revoked, bypassing memory protections or escalating privileges. (CVE-2025-10263) 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; - InfiniBand drivers; - Network drivers; - TCM subsystem; - exFAT file system; - Network file system (NFS) client; - Network file system (NFS) server daemon; - B.A.T.M.A.N. meshing protocol; - IPv4 networking; - IPv6 networking; - Netfilter; - RDS... It was discovered that some Arm processors could complete a broadcast translation lookaside buffer (TLB) invalidation before memory writes made through the invalidated translation were globally observed. A local attacker could possibly use this to write to memory after permission to do so had been revoked, bypassing memory protections or escalating privileges. (CVE-2025-10263) 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; - InfiniBand drivers; - Network drivers; - TCM subsystem; - exFAT file system; - Network file system (NFS) client; - Network file system (NFS) server daemon; - B.A.T.M.A.N. meshing protocol; - IPv4 networking; - IPv6 networking; - Netfilter; - RDS protocol 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.The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | || |---|---|---|---| | 20.04 LTS focal | linux-image-5.15.0-1110-ibm – 5.15.0-1110.114~20.04.1 | || | linux-image-ibm – 5.15.0.1110.114~20.04.1 | ||| | linux-image-ibm-5.15 – 5.15.0.1110.114~20.04.1 | 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. References - CVE-2026-64091 - CVE-2026-64007 - CVE-2026-63994 - CVE-2026-63993 - CVE-2026-63992 - CVE-2026-63984 - CVE-2026-63924 - CVE-2026-63922 - CVE-2026-63912 - CVE-2026-63888 - CVE-2026-64091 - CVE-2026-64007 - CVE-2026-63994 - CVE-2026-63993 - CVE-2026-63992 - CVE-2026-63984 - CVE-2026-63924 - CVE-2026-63922 - CVE-2026-63912 - CVE-2026-63888 - CVE-2026-63887 - CVE-2026-63808 - CVE-2026-63800 - CVE-2026-53398 - CVE-2026-53355 - CVE-2026-53354 - CVE-2026-53221 - CVE-2026-53216 - CVE-2026-53186 - CVE-2025-10263 Related notices - USN-8819-1 - USN-8819-2 - USN-8818-1 - USN-8817-1 - USN-8801-1 - USN-8800-1 - USN-8781-1 - USN-8760-1 - USN-8760-2 - USN-8748-1 - USN-8819-1 - USN-8819-2 - USN-8818-1 - USN-8817-1 - USN-8801-1 - USN-8800-1 - USN-8781-1 - USN-8760-1 - USN-8760-2 - USN-8748-1 - USN-8728-1 - USN-8728-2 - USN-8727-1 - USN-8726-1 - USN-8726-2 - USN-8726-3 - USN-8726-4 - USN-8664-1 - USN-8663-1 - USN-8660-1 - USN-8637-1 - USN-8629-1 - USN-8629-2 - USN-8629-3 - USN-8623-1 - USN-8622-1 - USN-8618-1 - USN-8603-1 - USN-8596-1 - USN-8593-1 Have additional questions?