732-byte Python exploit grants root access on all major Linux distributions since 2017 via CVE-2026-31431 page cache bug; affects Ubuntu, RHEL, Amazon Linux, SUSE

Copy Fail: 732 Bytes to Root on Every Major Linux Distribution. - Xint

Copy Fail: 732 Bytes to Root on Every Major Linux Distribution. - Xint | Blog Subscribe Search posts... AI for Security Vulnerability Research Copy Fail: 732 Bytes to Root on Every Major Linux Distribution. Xint Code disclosed CVE-2026-31431, an authencesn scratch-write bug chaining AF_ALG + splice() into a 4-byte page cache write. A 732-byte PoC gets root on Ubuntu, Amazon Linux, RHEL, SUSE. Apr 29, 2026 Contents What Makes Copy Fail DifferentThe Root Cause: Page Cache Pages in the Writable Sca...