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

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Summary by Cyber Security News23 Sep 2026, 13:12 CEST

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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

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