Critical Linux Kernel Privilege Escalation Bug 'Fragnesia' Added to CISA KEV Catalog

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2026-46300, a Linux kernel privilege escalation flaw dubbed 'Fragnesia,' to its Known Exploited Vulnerabilities (KEV) catalog. This bug, with a CVSS score of 7.8, resides in the networking code and allows a local attacker to rewrite read-only files in memory to gain root privileges. Federal civilian agencies were given a three-day window, until October 31, to patch the vulnerability.