static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
{
	struct net *net = x ? xs_net(x) : c->net;
	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);

	if (atomic_read(&net_pfkey->socks_nr) == 0)
		return 0;

	switch (c->event) {
	case XFRM_MSG_EXPIRE:
		return key_notify_sa_expire(x, c);
	case XFRM_MSG_DELSA:
	case XFRM_MSG_NEWSA:
	case XFRM_MSG_UPDSA:
		return key_notify_sa(x, c);
	case XFRM_MSG_FLUSHSA:
		return key_notify_sa_flush(c);
	case XFRM_MSG_NEWAE: /* not yet supported */
		break;
	default:
		pr_err("pfkey: Unknown SA event %d\n", c->event);
		break;
	}

	return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.