diff --git a/patches/kernel/0013-tcp-refine-memory-limit-test-in-tcp_fragment.patch b/patches/kernel/0013-tcp-refine-memory-limit-test-in-tcp_fragment.patch
new file mode 100644
index 0000000..0047c9a
--- /dev/null
+++ b/patches/kernel/0013-tcp-refine-memory-limit-test-in-tcp_fragment.patch
@@ -0,0 +1,42 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Eric Dumazet <edumazet@google.com>
+Date: Fri, 21 Jun 2019 06:09:55 -0700
+Subject: [PATCH] tcp: refine memory limit test in tcp_fragment()
+
+tcp_fragment() might be called for skbs in the write queue.
+
+Memory limits might have been exceeded because tcp_sendmsg() only
+checks limits at full skb (64KB) boundaries.
+
+Therefore, we need to make sure tcp_fragment() wont punish applications
+that might have setup very low SO_SNDBUF values.
+
+Fixes: f070ef2ac667 ("tcp: tcp_fragment() should apply sane memory limits")
+Signed-off-by: Eric Dumazet <edumazet@google.com>
+Reported-by: Christoph Paasch <cpaasch@apple.com>
+Tested-by: Christoph Paasch <cpaasch@apple.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+
+BugLink: https://bugs.launchpad.net/bugs/1831638
+CVE-2019-11478
+
+Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
+Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
+---
+ net/ipv4/tcp_output.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
+index e471ec48dcbc..de76eb94b4d2 100644
+--- a/net/ipv4/tcp_output.c
++++ b/net/ipv4/tcp_output.c
+@@ -1321,7 +1321,8 @@ int tcp_fragment(struct sock *sk, enum tcp_queue tcp_queue,
+ 	if (nsize < 0)
+ 		nsize = 0;
+ 
+-	if (unlikely((sk->sk_wmem_queued >> 1) > sk->sk_sndbuf)) {
++	if (unlikely((sk->sk_wmem_queued >> 1) > sk->sk_sndbuf &&
++		     tcp_queue != TCP_FRAG_IN_WRITE_QUEUE)) {
+ 		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPWQUEUETOOBIG);
+ 		return -ENOMEM;
+ 	}