Unexpected UID 0 Authentication (CVE-2026-31431)

Elgonad .@elgonad

•updated Apr 30, 2026•8•0•637

Detects authentication or privilege escalation events where a user account that is normally unprivileged suddenly reports as UID 0. This is a direct artifact of modifying the page cache of /etc/passwd in memory, which is the primary post-exploitation phase of the Copy Fail vulnerability (CVE-2026-31431).