Linux Kernel Fragnesia Privilege Escalation Vulnerability (CVE-2026-46300) Notice

Overview Recently, NSFOCUS CERT detected that the Linux kernel Fragnesia privilege escalation vulnerability (CVE-2026-46300) was disclosed online. Fragnesia is a new variant of Dirty Frag ; Due to the logical defects in the processing of shared page fragments by the ESP-in-TCP subsystem during the skb merge process, a local attacker with ordinary permissions can inject arbitrary bytes into the page cache of key binary files such as /usr/bin/su by constructing a specific…