Linux kernel TCP flaw CVE-2026-98432 rated 9.8 affects Ubuntu and RHEL

The Linux kernel's own CVE team rates CVE-2026-98432, a flaw in the kernel's TCP code, at 9.8 out of 10. It affects Ubuntu, Red Hat Enterprise Linux and other distributions. Anthropic said on October 27 that its AI model wrote an exploit for the flaw that lets a remote attacker with no credentials run commands as root on affected Linux servers. Patch as soon as your distribution ships a fixed kernel.