diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index e7c7b92ff37b3c8da680bbef486e735847ae79e0..52ba1b278c54589757e522b08238dbadede4cb70 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -1027,6 +1027,14 @@ static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
 		 */
 		if (nf_conntrack_confirm(skb) != NF_ACCEPT)
 			goto drop;
+
+		/* The ct may be dropped if a clash has been resolved,
+		 * so it's necessary to retrieve it from skb again to
+		 * prevent UAF.
+		 */
+		ct = nf_ct_get(skb, &ctinfo);
+		if (!ct)
+			skip_add = true;
 	}
 
 	if (!skip_add)