diff --git a/networking/openvswitch/centos/meta_patches/0009-net-mlx5-fix-memory-region-cache-lookup.patch b/networking/openvswitch/centos/meta_patches/0009-net-mlx5-fix-memory-region-cache-lookup.patch
new file mode 100644
index 000000000..38903a5be
--- /dev/null
+++ b/networking/openvswitch/centos/meta_patches/0009-net-mlx5-fix-memory-region-cache-lookup.patch
@@ -0,0 +1,25 @@
+From 5cabd4876e772f59a18a71a15f8fdfac0b0cf0ea Mon Sep 17 00:00:00 2001
+From: Steven Webster <steven.webster@windriver.com>
+Date: Wed, 17 Oct 2018 09:54:53 -0400
+Subject: [PATCH] net-mlx5-fix-memory-region-cache-lookup
+
+---
+ SPECS/openvswitch.spec | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/SPECS/openvswitch.spec b/SPECS/openvswitch.spec
+index f286a13..6d95f35 100644
+--- a/SPECS/openvswitch.spec
++++ b/SPECS/openvswitch.spec
+@@ -127,7 +127,7 @@ Patch422: 0003-vhost-extract-virtqueue-cleaning-and-freeing-functio.patch
+ Patch423: 0004-vhost-destroy-unused-virtqueues-when-multiqueue-not-.patch
+ Patch424: 0005-vhost-add-flag-for-built-in-virtio-driver.patch
+ Patch425: 0006-vhost-drop-virtqueues-only-with-built-in-virtio-driv.patch
+-
++Patch426: net-mlx5-fix-memory-region-cache-lookup.patch
+ 
+ BuildRequires: gcc
+ BuildRequires: python2-sphinx
+-- 
+1.8.3.1
+
diff --git a/networking/openvswitch/centos/meta_patches/PATCH_ORDER b/networking/openvswitch/centos/meta_patches/PATCH_ORDER
index f991a13e2..25e25de51 100644
--- a/networking/openvswitch/centos/meta_patches/PATCH_ORDER
+++ b/networking/openvswitch/centos/meta_patches/PATCH_ORDER
@@ -6,3 +6,4 @@
 0006-rpm-check-with-condition.patch
 0007-enable-mlx-pmds.patch
 0008-iommu-width-fix.patch
+0009-net-mlx5-fix-memory-region-cache-lookup.patch
diff --git a/networking/openvswitch/centos/patches/net-mlx5-fix-memory-region-cache-lookup.patch b/networking/openvswitch/centos/patches/net-mlx5-fix-memory-region-cache-lookup.patch
new file mode 100644
index 000000000..8b7ac9461
--- /dev/null
+++ b/networking/openvswitch/centos/patches/net-mlx5-fix-memory-region-cache-lookup.patch
@@ -0,0 +1,31 @@
+From de2067b4419323eb9cefdb2faed3245b28e7d4b2 Mon Sep 17 00:00:00 2001
+From: Steven Webster <steven.webster@windriver.com>
+Date: Wed, 17 Oct 2018 09:50:07 -0400
+Subject: [PATCH] net-mlx5-fix-memory-region-cache-lookup
+
+---
+ dpdk-17.11/drivers/net/mlx5/mlx5_rxtx.h | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/dpdk-17.11/drivers/net/mlx5/mlx5_rxtx.h b/dpdk-17.11/drivers/net/mlx5/mlx5_rxtx.h
+index d34f3cc..70db913 100644
+--- a/dpdk-17.11/drivers/net/mlx5/mlx5_rxtx.h
++++ b/dpdk-17.11/drivers/net/mlx5/mlx5_rxtx.h
+@@ -548,10 +548,12 @@ struct mlx5_mr *mlx5_txq_mp2mr_reg(struct mlx5_txq_data *, struct rte_mempool *,
+ 	struct mlx5_mr *mr;
+ 
+ 	assert(i < RTE_DIM(txq->mp2mr));
+-	if (likely(txq->mp2mr[i]->start <= addr && txq->mp2mr[i]->end >= addr))
++	if (likely(txq->mp2mr[i] != NULL &&
++		   txq->mp2mr[i]->start <= addr && txq->mp2mr[i]->end >= addr))
+ 		return txq->mp2mr[i]->lkey;
+ 	for (i = 0; (i != RTE_DIM(txq->mp2mr)); ++i) {
+-		if (unlikely(txq->mp2mr[i]->mr == NULL)) {
++		if (unlikely(txq->mp2mr[i] == NULL ||
++		    txq->mp2mr[i]->mr == NULL)) {
+ 			/* Unknown MP, add a new MR for it. */
+ 			break;
+ 		}
+-- 
+1.8.3.1
+