security: Active attack: Dirty Frag Linux vulnerability expands post-compromise risk
Microsoft Security Blog
2026-05-08
Dirty Frag is a newly disclosed Linux local privilege escalation vulnerability in kernel networking and memory-fragment handling components such as esp4, esp6, and rxrpc. It can escalate an unprivileged user to root and has been seen in limited in-the-wild activity; Microsoft Defender includes detection coverage.