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Fencer Vulns
high 7.5

CVE-2023-3966 json

Openvswsitch: ovs-vswitch fails to recover after malformed geneve metadata packet

published 2024-02-22 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44591

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

A flaw was found in Open vSwitch where multiple versions are vulnerable to crafted Geneve packets, which may result in a denial of service and invalid memory accesses. Triggering this issue requires that hardware offloading via the netlink path is enabled.

Patch / fix

  • openvswitch openvswitch 3.1.0
  • openvswitch Debian 12 3.1.0-2+deb12u1
  • openvswitch Debian 14, Debian 13 3.3.0-1

debian advisories DEBIAN-CVE-2023-3966

  • openvswitch Ubuntu 20.04 LTS 2.13.8-0ubuntu1.4
  • openvswitch Ubuntu 22.04 LTS 2.17.9-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-3966

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvswitch3.1 RHEL 9 3.1.0-88.el9fdp
  • openvswitch3.1-test RHEL 9 3.1.0-88.el9fdp
  • openvswitch3.1-ipsec RHEL 9 3.1.0-88.el9fdp
  • python3-openvswitch3.1 RHEL 9 3.1.0-88.el9fdp
  • openvswitch3.1 RHEL 8 3.1.0-96.el8fdp
  • openvswitch3.1-test RHEL 8 3.1.0-96.el8fdp
  • openvswitch3.1-ipsec RHEL 8 3.1.0-96.el8fdp
  • python3-openvswitch3.1 RHEL 8 3.1.0-96.el8fdp

red hat advisories RHSA-2024:1227RHSA-2024:1235RHSA-2024:1234

  • openvswitch3 SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +3 more 3.1.7-150500.3.25.1
  • openvswitch SLES for SAP 15 SP6, SLES 15 SP6-LTSS, openSUSE Leap 15.6 3.1.7-150600.33.9.1
  • openvswitch Linux Micro 6.0 3.1.7-4.1
  • openvswitch Linux Micro 6.1 3.1.7-slfo.1.1_2.1
  • openvswitch SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Package Hub 15 SP5 +6 more 2.14.2-150400.24.23.1
  • openvswitch SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 2.14.2-150300.19.20.1
  • openvswitch3 SLE Module for Server Applications 15 SP5, SLE Micro 5.5, openSUSE Leap 15.5 3.1.0-150500.3.16.1
  • openvswitch SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS 2.13.2-150200.9.34.1

suse advisories SUSE-SU-2026:0290-1SUSE-SU-2026:0280-1SUSE-SU-2026:20049-1SUSE-SU-2026:20061-1SUSE-SU-2024:0937-1SUSE-SU-2024:0922-1

  • openvswitch openSUSE Tumbleweed 3.1.0-19.1

opensuse advisories openSUSE-SU-2024:13725-1

  • openvswitch Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 2.17.9-r0

alpine advisories ALPINE-CVE-2023-3966

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvswitch Azure Linux 3.0 3.3.0-1

azure linux advisories AZL-35089

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-3966 updated cvss 7.5

openvswsitch: ovs-vswitch fails to recover after malformed geneve metadata packet

  • Red Hat Fast Datapath for RHEL 7 openvswitch, openvswitch2.10, openvswitch2.11, openvswitch2.12, openvswitch2.13, openvswitch-test, +19 more Red Hat Fast Datapath for RHEL 8 openvswitch2.11, openvswitch2.12, openvswitch2.13, openvswitch2.15, openvswitch2.16, openvswitch2.11-test, +17 more Red Hat Fast Datapath for RHEL 9 openvswitch3.0, openvswitch3.2, openvswitch2.17, openvswitch3.0-test, openvswitch3.2-test, openvswitch2.17-test, +6 more Red Hat Enterprise Linux 7 openvswitch, openvswitch-test, python-openvswitch, openvswitch-controller
    affected: no fix planned “Out of support scope”
  • Red Hat Fast Datapath for Red Hat Enterprise Linux 8 openvswitch3.1 3.1.0-96.el8fdp, openvswitch2.17 2.17.0-148.el8fdp, openvswitch3.1-test 3.1.0-96.el8fdp, openvswitch3.1-ipsec 3.1.0-96.el8fdp, openvswitch2.17-test 2.17.0-148.el8fdp, python3-openvswitch3.1 3.1.0-96.el8fdp, +4 more
    fixed: vendor fix RHSA-2024:1234
  • Red Hat Fast Datapath for Red Hat Enterprise Linux 9 openvswitch3.1 3.1.0-88.el9fdp, openvswitch3.1-test 3.1.0-88.el9fdp, openvswitch3.1-ipsec 3.1.0-88.el9fdp, python3-openvswitch3.1 3.1.0-88.el9fdp
    fixed: vendor fix RHSA-2024:1227
  • Red Hat OpenShift Container Platform 3.11 openvswitch-ovn-kubernetes
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.25% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a openvswitch
  • Red Hat Fast Datapath for RHEL 7
  • Red Hat Fast Datapath for RHEL 8
  • Red Hat Fast Datapath for RHEL 9
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat OpenShift Container Platform 3.11
  • RDO OpenStack RDO
  • Fedora Fedora

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.