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Exploit Released for Unpatched Ubuntu Linux Flaw Enabling Host-Root Container Escape

A use-after-free in the Linux kernel's AF_UNIX socket subsystem can be used to escape a container and gain root on the host, security firm DepthFirst said in research published September 22. The flaw, tracked as CVE-2026-80521 (CVSS score: 7. 8), was fixed upstream on August 6, but Ubuntu has not shipped the patch for its 26. 04, 24. 04, or 22. 04 LTS releases. DepthFirst