diff --git a/SOURCES/openvswitch-3.3.0.patch b/SOURCES/openvswitch-3.3.0.patch
index d6c4d8f..be218de 100644
--- a/SOURCES/openvswitch-3.3.0.patch
+++ b/SOURCES/openvswitch-3.3.0.patch
@@ -1085,6 +1085,29 @@ index 80da20d9f0..5cb1fc89ae 100644
      retval = get_socket_rcvbuf(sock->fd);
      if (retval < 0) {
          retval = -retval;
+diff --git a/lib/odp-execute-avx512.c b/lib/odp-execute-avx512.c
+index 50c48bfd47..a74a85dc1a 100644
+--- a/lib/odp-execute-avx512.c
++++ b/lib/odp-execute-avx512.c
+@@ -366,6 +366,8 @@ avx512_get_delta(__m256i old_header, __m256i new_header)
+                                           0xF, 0xF, 0xF, 0xF);
+     v_delta = _mm256_permutexvar_epi32(v_swap32a, v_delta);
+ 
++    v_delta = _mm256_hadd_epi32(v_delta, v_zeros);
++    v_delta = _mm256_shuffle_epi8(v_delta, v_swap16a);
+     v_delta = _mm256_hadd_epi32(v_delta, v_zeros);
+     v_delta = _mm256_hadd_epi16(v_delta, v_zeros);
+ 
+@@ -575,6 +577,9 @@ avx512_ipv6_sum_header(__m512i ip6_header)
+                                           0xF, 0xF, 0xF, 0xF);
+ 
+     v_delta = _mm256_permutexvar_epi32(v_swap32a, v_delta);
++
++    v_delta = _mm256_hadd_epi32(v_delta, v_zeros);
++    v_delta = _mm256_shuffle_epi8(v_delta, v_swap16a);
+     v_delta = _mm256_hadd_epi32(v_delta, v_zeros);
+     v_delta = _mm256_hadd_epi16(v_delta, v_zeros);
+ 
 diff --git a/lib/odp-util.c b/lib/odp-util.c
 index 9306c9b4d4..5e4f34cf74 100644
 --- a/lib/odp-util.c
@@ -2611,6 +2634,77 @@ index f321bae55f..8565a0bae9 100644
 +    *) HAVE_PYTEST=no
 +       echo "$0: unexpected error probing Python unit test requirements" >&2 ;;
  esac
+diff --git a/tests/dpif-netdev.at b/tests/dpif-netdev.at
+index 790b5a43af..bdc24cc307 100644
+--- a/tests/dpif-netdev.at
++++ b/tests/dpif-netdev.at
+@@ -1091,3 +1091,66 @@ OVS_VSWITCHD_STOP(["dnl
+ /Error: unknown miniflow extract implementation superstudy./d
+ /Error: invalid study_pkt_cnt value: -pmd./d"])
+ AT_CLEANUP
++
++AT_SETUP([datapath - Actions Autovalidator Checksum])
++
++OVS_VSWITCHD_START(add-port br0 p0 -- set Interface p0 type=dummy \
++                   -- add-port br0 p1 -- set Interface p1 type=dummy)
++
++AT_CHECK([ovs-appctl odp-execute/action-impl-set autovalidator], [0], [dnl
++Action implementation set to autovalidator.
++])
++
++dnl Add flows to trigger checksum calculation.
++AT_DATA([flows.txt], [dnl
++  in_port=p0,ip,actions=mod_nw_src=10.1.1.1,p1
++  in_port=p0,ipv6,actions=set_field:fc00::100->ipv6_src,p1
++])
++AT_CHECK([ovs-ofctl del-flows br0])
++AT_CHECK([ovs-ofctl -Oopenflow13 add-flows br0 flows.txt])
++
++dnl Make sure checksum won't be offloaded.
++AT_CHECK([ovs-vsctl set Interface p0 options:ol_ip_csum=false])
++AT_CHECK([ovs-vsctl set Interface p0 options:ol_ip_csum_set_good=false])
++
++AT_CHECK([ovs-vsctl set Interface p1 options:pcap=p1.pcap])
++
++dnl IPv4 packet with values that will trigger carry-over addition for checksum.
++flow_s_v4="
++  eth_src=47:42:86:08:17:50,eth_dst=3e:55:b5:9e:3a:fb,dl_type=0x0800,
++  nw_src=229.167.36.90,nw_dst=130.161.64.186,nw_proto=6,nw_ttl=64,nw_frag=no,
++  tp_src=54392,tp_dst=5201,tcp_flags=ack"
++
++good_frame=$(ovs-ofctl compose-packet --bare "${flow_s_v4}")
++AT_CHECK([ovs-appctl netdev-dummy/receive p0 ${good_frame}])
++
++dnl Checksum should change to 0xAC33 with ip_src changed to 10.1.1.1
++dnl by the datapath while processing the packet.
++flow_expected=$(echo "${flow_s_v4}" | sed 's/229.167.36.90/10.1.1.1/g')
++good_expected=$(ovs-ofctl compose-packet --bare "${flow_expected}")
++AT_CHECK([ovs-pcap p1.pcap > p1.pcap.txt 2>&1])
++AT_CHECK_UNQUOTED([tail -n 1 p1.pcap.txt], [0], [${good_expected}
++])
++
++dnl Repeat similar test for IPv6.
++flow_s_v6="
++  eth_src=8a:bf:7e:2f:05:84,eth_dst=0a:8f:39:4f:e0:73,dl_type=0x86dd,
++  ipv6_src=2f8a:2076:3926:9e7:2d47:4bc9:9c7:17f3,
++  ipv6_dst=7287:10dd:2fb9:41d5:3eb2:2c7a:11b0:6258,
++  ipv6_label=0x51ac,nw_proto=6,nw_ttl=142,nw_frag=no,
++  tp_src=20405,tp_dst=20662,tcp_flags=ack"
++
++good_frame_v6=$(ovs-ofctl compose-packet --bare "${flow_s_v6}")
++AT_CHECK([ovs-appctl netdev-dummy/receive p0 ${good_frame_v6}])
++
++dnl Checksum should change to 0x59FD with ipv6_src changed to fc00::100
++dnl by the datapath while processing the packet.
++flow_expected_v6=$(echo "${flow_s_v6}" | \
++  sed 's/2f8a:2076:3926:9e7:2d47:4bc9:9c7:17f3/fc00::100/g')
++good_expected_v6=$(ovs-ofctl compose-packet --bare "${flow_expected_v6}")
++AT_CHECK([ovs-pcap p1.pcap > p1.pcap.txt 2>&1])
++AT_CHECK_UNQUOTED([tail -n 1 p1.pcap.txt], [0], [${good_expected_v6}
++])
++
++OVS_VSWITCHD_STOP
++AT_CLEANUP
 diff --git a/tests/library.at b/tests/library.at
 index 7b4acebb8a..d962e1b3fd 100644
 --- a/tests/library.at
diff --git a/SPECS/openvswitch3.3.spec b/SPECS/openvswitch3.3.spec
index 1ec72b0..471a507 100644
--- a/SPECS/openvswitch3.3.spec
+++ b/SPECS/openvswitch3.3.spec
@@ -57,7 +57,7 @@ Summary: Open vSwitch
 Group: System Environment/Daemons daemon/database/utilities
 URL: http://www.openvswitch.org/
 Version: 3.3.0
-Release: 22%{?dist}
+Release: 23%{?dist}
 
 # Nearly all of openvswitch is ASL 2.0.  The bugtool is LGPLv2+, and the
 # lib/sflow*.[ch] files are SISSL
@@ -767,6 +767,12 @@ exit 0
 %endif
 
 %changelog
+* Fri May 31 2024 Open vSwitch CI <ovs-ci@redhat.com> - 3.3.0-23
+- Merging upstream branch-3.3 [RH git: bc25876bb0]
+    Commit list:
+    6688bff495 odp-execute: Fix AVX checksum calculation.
+
+
 * Thu May 30 2024 Open vSwitch CI <ovs-ci@redhat.com> - 3.3.0-22
 - Merging upstream branch-3.3 [RH git: 4a1c8a2b9c]
     Commit list: