Chris Williams on Mythryl: “For further proof that OS development is hard: copy.fail A page…”

For further proof that OS development is hard: copy.fail A page cache corruption that stays in memory but never hits the disk. Since the disk remains "clean," checksums don’t catch it. It allows unprivileged users to gain root or escape containers by corrupting shared memory of sensitive binaries.

copy.failCopy Fail — 732 Bytes to RootCVE-2026-31431. 100% Reliable Linux LPE — no race, no per-distro offsets, page-cache write that bypasses on-disk file-integrity tools and crosses containers. Found by Xint Code.

30/4/26, 9:18 am1 repost1 like

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