Dirty Frag: A new Linux privilege escalation vulnerability is already in the wild

Dirty Frag is an unpatched, high-reliability Linux kernel privilege escalation vulnerability that allows an unprivileged local user to gain root by chaining the xfrm-ESP Page-Cache Write and RxRPC Page-Cache Write flaws. A public proof-of-concept is already available and the issue affects major distributions including Ubuntu, RHEL, Fedora, AlmaLinux, and CentOS Stream; temporary mitigation is to blocklist the esp4, esp6, and rxrpc kernel modules until official patches are released.