GitHub - tgies/copy-fail-c: Cross-platform C port of the Copy Fail Linux LPE (CVE-2026-31431). Disclosed 2026-04-29 by Theori / Xint.

Show HN: Copy-fail-C – portable C port of CVE-2026-31431, with a checker

Cross-platform C port of the Copy Fail Linux LPE (CVE-2026-31431). Disclosed 2026-04-29 by Theori / Xint. - tgies/copy-fail-c

4 points by tgies 175 days ago github.com 0 comments

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Original Text

This is a C port of Theori/Xint's Copy Fail PoC (https://copy.fail/, 2026-04-29). The original depended on Python and embedded x86_64 shellcode. I managed to reimplement the shellcode as portable C using nolibc borrowed from the kernel, and now the whole thing can be compiled for & works on any arch supported by nolibc.

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