Fragnesia (CVE-2026-46300): Linux Kernel LPE via XFRM ESP-in-TCP

Fragnesia is a local privilege escalation vulnerability in the Linux kernel XFRM ESP-in-TCP subsystem (CVE-2026-46300). Related to the Dirty Frag / Copy Fail class of page cache issues. Amazon Linux is not affected as espintcp module is not provided.