CISA gives agencies three days to fix Linux flaw chained with PHP2Shell to hack firewalls
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Fragnesia, a Linux kernel flaw tracked as CVE-2026-46300, to its catalog of exploited vulnerabilities on October 28, 2026, and gave federal civilian agencies until October 31 to fix it. CISA said attackers can chain the flaw with the PHP2Shell flaws in PHP to plant web shells and run commands as root. Security firm Dream reported that a suspected China-linked attacker used that chain to take over 25 servers, three of them in a U.S. government-affiliated environment.