static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign,
		struct ip_tunnel_parm *parms)
{
	__be32 remote = parms->iph.daddr;
	__be32 local = parms->iph.saddr;
	__be32 key = parms->i_key;
	unsigned int h = HASH(key);
	int prio = 0;

	if (local)
		prio |= 1;
	if (remote && !ipv4_is_multicast(remote)) {
		prio |= 2;
		h ^= HASH(remote);
	}

	return &ign->tunnels[prio][h];
}

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