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Copy Fail is a nine-year-old logic flaw in the Linux kernel's algif_aead crypto module (CVE-2026-31431). A 732-byte Python script writes four bytes into the page cache, modifies the in-memory copy of su, and lands a root shell on Ubuntu, Debian, R...

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Copy Fail is a nine-year-old logic flaw in the Linux kernel's algif_aead crypto module (CVE-2026-31431). A 732-byte Python script writes four bytes into the page cache, modifies the in-memory copy of su, and lands a root shell on Ubuntu, Debian, R...

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