CVE-2026-80521: Unpatched Ubuntu Linux Flaw Enables Host-Root Container Escape
A use-after-free vulnerability in the Linux kernel's AF_UNIX socket subsystem, tracked as CVE-2026-80521 (CVSS score: 7.8), allows container escape and host root access. The flaw was patched upstream on August 6 but remains unpatched in Ubuntu 26.04, 24.04, and 22.04 LTS releases. An exploit has been released, but active exploitation has not been confirmed. Immediate patching or mitigation is recommended.