Mitigation strategy for copy.fail and disk cache poisoning of setuid binaries

copy.fail ( CVE-2026-31431 ) is a Linux kernel bug where an in-place modification of a pipe scatter list by the algif_aead module (crypto module's AEAD algorithm) can be used to modify the disk cache of any file, potentially a setuid binary, by an unprivileged user. It allows local privilege escalation from an unprivileged user to root. This vulnerability was a performance optimization presumably…