Dirty Frag: Linux Kernel Local Privilege Escalation via ESP and RxRPC

A newly disclosed Linux kernel local privilege escalation chain called `Dirty Frag` (CVE-2026-43284, CVE-2026-43500) combines page-cache write primitives in the xfrm-ESP (IPsec) and RxRPC subsystems to enable deterministic, reliable corruption of page-backed memory and local root escalation; a public proof-of-concept exists, multiple major distributions and kernel versions are affected, and mitigations (module blacklisting, hardening local access, monitoring) are recommended until patches are available.