The most severe Linux threat to surface in years catches the world flat-footed

Publicly released exploit code for a critical privilege escalation vulnerability in Linux, known as CopyFail (CVE-2026-31431), allows attackers to gain root access across all vulnerable distributions with a single piece of code. The researchers from Theori disclosed the vulnerability 5 weeks after notifying the Linux kernel security team, who patched it in several versions, but many distributions had not yet incorporated the fixes at the time of disclosure. The exploit poses a serious threat to data centers and personal devices, enabling attackers to compromise systems and containers.