Linux TCP RCE flaw patched by Red Hat, Ubuntu testing

Red Hat has released fixes for CVE-2026-98432, a critical use-after-free vulnerability in the Linux kernel's IPv4 TCP code affecting RHEL 8, 9, and 10. The flaw allows unauthenticated remote attackers to execute code. Ubuntu has fixes in its testing channel but no general release date yet. Administrators should prioritize updating Red Hat systems immediately; Ubuntu users should track testing updates closely.