Not good. Local Privilege Escalation.

[nikslor@mastodon.social]

RE: https://infosec.exchange/@xint/116488991686309788

Not good. Local Privilege Escalation. Please check your systems and patch accordingly.

Copy Fail — 732 Bytes to Root

Copy Fail (CVE-2026-31431): a 732-byte Linux LPE — straight-line, no race, no per-distro offsets. Same Python script roots Ubuntu, Amazon Linux, RHEL, SUSE since 2017. Page-cache write bypasses on-disk file-integrity tools and crosses container boundaries. Found by Xint Code.

Xint (copy.fail)