USN-8851-3: Linux kernel fixes for Azure (NFS, IPv6 and Netfilter)

Notice USN-8851-3 appears in the Ubuntu Security feed, with content made available through automatic translation, and was dated October 5, 2026. According to the text, several security problems were found in the Linux kernel that could possibly be used by an attacker to compromise the system. The update fixes flaws in three subsystems: the network file system server daemon (NFS), the IPv6 network stack and Netfilter. The identifiers cited are CVE-2025-38724, CVE-2026-53131 and CVE-2026-53221. The text we received does not detail affected versions or the specific impact of each flaw, so that information should be checked in the official notice. For organizations running Linux on Azure, the relevance is to apply the kernel update indicated by the distribution vendor and restart servers as the official guidance says. Consult the original notice on the Ubuntu security portal by searching for USN-8851-3, and confirm the installed kernel version after the fix. Rota Nacional does not patch kernels and does not replace your infrastructure patch management.