Copy Fail Linux Vulnerability (CVE-2026-31431)

CVE-2026-31431 is the most critical Linux vulnerability to emerge in 2026, enabling unprivileged users to escalate to root access via a 732-byte Python script that exploits the kernel's page cache write mechanism. Present in all Linux distributions since 2017, this flaw affects an estimated 30 million servers globally and demands immediate patching. It outperforms #2 DEEP#DOOR in severity because it requires no initial foothold—just local execution—making it a faster path to full system compromise than typical privilege escalation bugs.