CVE-2023-3966 — A flaw was found in Open vSwitch where multiple versions are vulnerable to craft

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / openvswitch	3.1.0
Red Hat	Fast Datapath for RHEL 7	unspecified
Red Hat	Fast Datapath for RHEL 7	unspecified
Red Hat	Fast Datapath for RHEL 7	unspecified
Red Hat	Fast Datapath for RHEL 7	unspecified
Red Hat	Fast Datapath for RHEL 7	unspecified
Red Hat	Fast Datapath for RHEL 8	unspecified
Red Hat	Fast Datapath for RHEL 8	unspecified
Red Hat	Fast Datapath for RHEL 8	unspecified
Red Hat	Fast Datapath for RHEL 8	unspecified
Red Hat	Fast Datapath for RHEL 8	unspecified
Red Hat	Fast Datapath for RHEL 8	unspecified
Red Hat	Fast Datapath for RHEL 8	unspecified
Red Hat	Fast Datapath for RHEL 9	unspecified
Red Hat	Fast Datapath for RHEL 9	unspecified
Red Hat	Fast Datapath for RHEL 9	unspecified
Red Hat	Fast Datapath for RHEL 9	unspecified
Red Hat	Red Hat Enterprise Linux 7	unspecified
Red Hat	Red Hat OpenShift Container Platform 3.11	unspecified
RDO	OpenStack RDO	unspecified
Fedora	Fedora	unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2024-02-22T12:15:53.128Z
• Last modified: 2025-02-13T17:03:14.623Z

09References

• access.redhat.com — https://access.redhat.com/security/cve/CVE-2023-3966
• bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=2178363
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…