session_close_by_pid(pid_t pid, int status)
{
	Session *s = session_by_pid(pid);
	if (s == NULL) {
		debug("session_close_by_pid: no session for pid %ld",
		    (long)pid);
		return;
	}
	if (s->chanid != -1)
		session_exit_message(s, status);
	if (s->ttyfd != -1)
		session_pty_cleanup(s);
	s->pid = 0;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.