int netif_skb_features(struct sk_buff *skb)
{
	__be16 protocol = skb->protocol;
	int features = skb->dev->features;

	if (protocol == htons(ETH_P_8021Q)) {
		struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
		protocol = veh->h_vlan_encapsulated_proto;
	} else if (!vlan_tx_tag_present(skb)) {
		return harmonize_features(skb, protocol, features);
	}

	features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);

	if (protocol != htons(ETH_P_8021Q)) {
		return harmonize_features(skb, protocol, features);
	} else {
		features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
				NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
		return harmonize_features(skb, protocol, features);
	}
}

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