diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 011d69029112..60876262b3fb 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -6659,6 +6659,14 @@ static struct skb_ext *skb_ext_maybe_cow(struct skb_ext *old,
 		for (i = 0; i < sp->len; i++)
 			xfrm_state_hold(sp->xvec[i]);
 	}
+#endif
+#ifdef CONFIG_MCTP_FLOWS
+	if (old_active & (1 << SKB_EXT_MCTP)) {
+		struct mctp_flow *flow = skb_ext_get_ptr(old, SKB_EXT_MCTP);
+
+		if (flow->key)
+			refcount_inc(&flow->key->refs);
+	}
 #endif
 	__skb_ext_put(old);
 	return new;
diff --git a/net/mctp/route.c b/net/mctp/route.c
index ceee44ea09d9..01c530dbc1a6 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -843,6 +843,9 @@ static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
 		/* copy message payload */
 		skb_copy_bits(skb, pos, skb_transport_header(skb2), size);
 
+		/* we need to copy the extensions, for MCTP flow data */
+		skb_ext_copy(skb2, skb);
+
 		/* do route */
 		rc = rt->output(rt, skb2);
 		if (rc)