diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index b81ca117dac7a0..e4cb0ff4dcf413 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -660,6 +660,12 @@ static int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
 {
 	int err;
 
+	if (x->outer_mode.encap == XFRM_MODE_BEET &&
+	    ip_is_fragment(ip_hdr(skb))) {
+		net_warn_ratelimited("BEET mode doesn't support inner IPv4 fragments\n");
+		return -EAFNOSUPPORT;
+	}
+
 	err = xfrm4_tunnel_check_size(skb);
 	if (err)
 		return err;
@@ -705,8 +711,15 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb)
 static int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
 {
 #if IS_ENABLED(CONFIG_IPV6)
+	unsigned int ptr = 0;
 	int err;
 
+	if (x->outer_mode.encap == XFRM_MODE_BEET &&
+	    ipv6_find_hdr(skb, &ptr, NEXTHDR_FRAGMENT, NULL, NULL) >= 0) {
+		net_warn_ratelimited("BEET mode doesn't support inner IPv6 fragments\n");
+		return -EAFNOSUPPORT;
+	}
+
 	err = xfrm6_tunnel_check_size(skb);
 	if (err)
 		return err;