Fragnesia: New Local Linux Kernel Privilege Flaw Emerges
π Fragnesia (CVE-2026-46300) is a local Linux kernel privilege escalation that exploits the XFRM ESP-in-TCP subsystem to obtain a memory write primitive, enabling in-memory modification of security-sensitive files while bypassing standard filesystem permissions. A public PoC exists, but remote exploitation is not possible; an attacker needs local access and control of socket operations. Vendors including Red Hat and Ubuntu are issuing patches and workarounds, and administrators should update kernels, consider disabling esp4/esp6 or avoiding kernels built with CONFIG_INET_ESPINTCP, and increase monitoring until systems are patched.
