The Short Version William Bowling of V12 Security disclosed a Linux kernel local privilege escalation on May 13, 2026, publishing both a technical write-up and a working proof-of-concept. The vulnerability, named Fragnesia, sits in the kernel’s XFRM ESP-in-TCP subsystem and allows an unprivileged local attacker to overwrite system binaries in the kernel page cache, execute them, … Continue reading Fragnesia: A New Linux Kernel Privilege Escalation That Emerged From Prior Kernel Patches