diff --git a/include/net/tcp.h b/include/net/tcp.h
index 50ea0f9551e9ce7ccb276638141e54d54c21b4ef..73959a256fdcd21bc61a7bad11064919214f1ea7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -463,6 +463,7 @@ int __cookie_v4_check(const struct iphdr *iph, const struct tcphdr *th,
 		      u32 cookie);
 struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb);
 struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
+					    const struct tcp_request_sock_ops *af_ops,
 					    struct sock *sk, struct sk_buff *skb);
 #ifdef CONFIG_SYN_COOKIES
 
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 0248216c92caf164034ec24a9941517e5a126f23..fbbec203c3d4efac0ce40b075c20dc36e8368c90 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -283,6 +283,7 @@ bool cookie_ecn_ok(const struct tcp_options_received *tcp_opt,
 EXPORT_SYMBOL(cookie_ecn_ok);
 
 struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
+					    const struct tcp_request_sock_ops *af_ops,
 					    struct sock *sk,
 					    struct sk_buff *skb)
 {
@@ -299,6 +300,10 @@ struct request_sock *cookie_tcp_reqsk_alloc(const struct request_sock_ops *ops,
 		return NULL;
 
 	treq = tcp_rsk(req);
+
+	/* treq->af_specific might be used to perform TCP_MD5 lookup */
+	treq->af_specific = af_ops;
+
 	treq->syn_tos = TCP_SKB_CB(skb)->ip_dsfield;
 #if IS_ENABLED(CONFIG_MPTCP)
 	treq->is_mptcp = sk_is_mptcp(sk);
@@ -366,7 +371,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
 		goto out;
 
 	ret = NULL;
-	req = cookie_tcp_reqsk_alloc(&tcp_request_sock_ops, sk, skb);
+	req = cookie_tcp_reqsk_alloc(&tcp_request_sock_ops,
+				     &tcp_request_sock_ipv4_ops, sk, skb);
 	if (!req)
 		goto out;
 
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 49e9342ee5518bbda9cc4c88b999862cb65065bd..7dfc70a32bcb5b712c39cb7eac4e9545accfcd50 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -170,7 +170,8 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
 		goto out;
 
 	ret = NULL;
-	req = cookie_tcp_reqsk_alloc(&tcp6_request_sock_ops, sk, skb);
+	req = cookie_tcp_reqsk_alloc(&tcp6_request_sock_ops,
+				     &tcp_request_sock_ipv6_ops, sk, skb);
 	if (!req)
 		goto out;