CVE-2026-5398

The implementation of TIOCNOTTY failed to clear a back-pointer from the structure representing the controlling terminal to the calling process’ session. If the invoking process then exits, the terminal structure may end up containing a pointer to freed memory.

A malicious process can abuse the dangling pointer to grant itself root privileges.

More information : https://security.freebsd.org/advisories/FreeBSD-SA-26:10.tty.asc