Fragnesia (CVE-2026-46300): Frequently asked questions about new Linux Kernel XFRM ESP-in-TCP privilege escalation

A new Linux kernel local privilege escalation exploit with a public proof-of-concept targets the same subsystem as Dirty Frag but requires a separate patch. Key Takeaways CVE-2026-46300 (Fragnesia) is the latest high severity local privilege escalation vulnerability in the Linux kernel, following the disclosure of both Dirty Frag and Copy Fail. A public proof-of-concept is available and the exploit has been confirmed working on Ubuntu systems, though no in-the-wild exploitation has been reported