Fragnesia: New Linux Kernel LPE Emerging from Dirty Frag
🔒Fragnesia (CVE-2026-46300) is a newly disclosed Linux kernel local privilege escalation discovered by William Bowling of Zellic and the V12 team, with a working PoC published on May 13. The flaw permits unprivileged users to overwrite kernel page-cache contents of read-only files, enabling in-memory tampering that can spawn a root shell without touching disk. It stems from shared page fragment bookkeeping failures tied to ESP-in-TCP decryption behavior and is being mitigated by interim distro backports and module hardening.
