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Abstract data visualization of CVE-2026-80521 container escape showing a 50-day gap between the upstream Linux kernel fix on August 6, 2026 and the absence of any Ubuntu LTS patch as of September 25, 2026, with a public exploit released on September 22

Ubuntu container escape CVE: no patch, public exploit

CVE-2026-80521 enables a container escape to host root via a Linux kernel use-after-free. Ubuntu has no LTS patch 50 days after the upstream fix.

Lars Cornelissen · Sep 25, 2026