RefluXFS is a Linux kernel LPE flaw (CVSS 7.8). A race in the XFS copy-on-write path lets an unprivileged user overwrite any readable file on disk and become root. It works even under SELinux Enforcing.

Linux 7.0 hit mainline on April 12, 2026. Self-healing XFS, post-quantum module signatures, 12% faster UDP receive, Rust goes permanent, and more.