channel_set_fds(int id, int rfd, int wfd, int efd,
    int extusage, int nonblock, int is_tty, u_int window_max)
{
	Channel *c = channel_lookup(id);

	if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
		fatal("channel_activate for non-larval channel %d.", id);
	channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty);
	c->type = SSH_CHANNEL_OPEN;
	c->local_window = c->local_window_max = window_max;
	packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
	packet_put_int(c->remote_id);
	packet_put_int(c->local_window);
	packet_send();
}

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