diff -drupN a/net/ipv6/udp.c b/net/ipv6/udp.c
--- a/net/ipv6/udp.c	2018-08-06 17:23:04.000000000 +0300
+++ b/net/ipv6/udp.c	2022-06-12 05:28:14.000000000 +0300
@@ -1162,6 +1162,7 @@ do_udp_sendmsg:
 		fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
 
 	fl6.flowi6_mark = sk->sk_mark;
+	fl6.flowi6_uid = sk->sk_uid;
 
 	if (msg->msg_controllen) {
 		opt = &opt_space;