CopyFail Go (CVE-2026-31431) Skill by ara.so — Daily 2026 Skills collection. CopyFail Go is a static Go binary implementation of CVE-2026-31431, a straight-line logic flaw in the Linux kernel's AF ALG AEAD scatterlist handling. Unlike race-condition LPEs, it requires no timing window or kernel-specific offsets — the same binary roots every affected Linux distribution shipped since 2017. Affected kernel range: - Floor: — August 2017, v4.14 (AF ALG iov iter rework) - Ceiling: — April 2026 (fix: separates source/destination scatterlists) Confirmed vulnerable at disclosure: Ubuntu, RHEL, SUSE, Am…