diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index a6c0479c1d55f8f52b71449895ff56b5903f2ce2..bbb5ffb3397d8b98227c81023cac218603822619 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1081,8 +1081,24 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt,
 		err = call_fib6_entry_notifiers(info->nl_net,
 						FIB_EVENT_ENTRY_ADD,
 						rt, extack);
-		if (err)
+		if (err) {
+			struct fib6_info *sibling, *next_sibling;
+
+			/* If the route has siblings, then it first
+			 * needs to be unlinked from them.
+			 */
+			if (!rt->fib6_nsiblings)
+				return err;
+
+			list_for_each_entry_safe(sibling, next_sibling,
+						 &rt->fib6_siblings,
+						 fib6_siblings)
+				sibling->fib6_nsiblings--;
+			rt->fib6_nsiblings = 0;
+			list_del_init(&rt->fib6_siblings);
+			rt6_multipath_rebalance(next_sibling);
 			return err;
+		}
 
 		rcu_assign_pointer(rt->fib6_next, iter);
 		atomic_inc(&rt->fib6_ref);