CVE-2026-31431: Copy Fail, the Linux Exploit That Hid in Plain Sight for Nine Years

On April 29, 2026, a vulnerability was publicly disclosed that affects virtually every Linux system built since 2017. CVE-2026-31431, nicknamed Copy Fail, is a local privilege escalation flaw in the kernel s cryptographic subsystem. It allows any unprivileged user to gain full root access using a script of less than 800 bytes. No race conditions. No...