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CircleCI Response to CVE-2026-43499 ("GhostLock" Linux kernel vulnerability) - Security - CircleCI Discuss

On July 7, 2026, the High Severity Linux kernel vulnerability CVE-2026-43499 (aka “GhostLock”) was disclosed, which could allow a user already running code on a system to gain elevated access and potentially escape container isolation. In response, our engineering team began an Emergency Maintenance on July 9 at 21:00 UTC to roll out patched kernel images across the potentially vulnerable parts of our fleet. In order to exploit CVE-2026-43499, an attacker must already have the ability to run co...