Copy Fail: 732 Bytes to Root on Every Major Linux Distributions 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. Copy Fail: 732 Bytes to Root on Every Major Linux Distributions Xint Code Research Team Copy Fail (CVE-2026-31431) is a logic bug in the Linux kern