Copy Fail: New Linux bug enables Root via page‑cache corruption
Linux flaw CVE‑2026‑31431, ‘Copy Fail,’ lets any local user write four bytes into page cache files, enabling easy escalation to root on major distros. Xint Code researchers warn of a serious Linux flaw, tracked as CVE-2026-31431 (CVSS score of 7.8), dubbed Copy Fail. It lets any local, unprivileged user write four controlled bytes into the […]
Xint Code researchers warn of a serious Linux flaw, tracked as CVE-2026-31431 (CVSS score of 7.8), dubbed Copy Fail. It lets any local, unprivileged user write four controlled bytes into the page cache of any readable file, enabling escalation to root on major distributions.
The bug combines AF_ALG and splice() to write 4 bytes into the page cache of any readable file. A 732-byte script can modify a setuid binary in memory, without changing the file on disk, making detection difficult. The issue affects major distributions like Ubuntu, RHEL, SUSE, and Amazon Linux, and can even cross container boundaries due to shared page cache.
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