Update Linux Now As 9-Year-Old Root Hack Confirmed, CISA Warns Users

CISA says the Linux kernel flaw CVE-2026-31431 is being actively exploited and should be patched immediately.

The bug, nicknamed Copy Fail, can let a local attacker gain root on vulnerable Linux systems with a small exploit.

Researchers at Theori disclosed the logic flaw, and CISA added it to its known exploited vulnerabilities catalog.

Administrators should update affected Linux distributions quickly, especially internet-facing servers and workstations.