CVE-2025-0650: Ovn: egress acls may be bypassed via specially crafted udp packet

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-23 · updated 2026-06-17
Weakness: CWE-284

Description

A flaw was found in the Open Virtual Network (OVN). Specially crafted UDP packets may bypass egress access control lists (ACLs) in OVN installations configured with a logical switch with DNS records set on it and if the same switch has any egress ACLs configured. This issue can lead to unauthorized access to virtual machines and containers running on the OVN network.

Affected products

Red Hat Fast Datapath for Red Hat Enterprise Linux 8: all versions — fixed in 0:22.03.7-11.el8fdp, 0:22.06.0-273.el8fdp, 0:22.09.2-86.el8fdp, 0:22.12.1-107.el8fdp, 0:23.03.3-22.el8fdp, 0:23.06.4-26.el8fdp
Red Hat Fast Datapath for Red Hat Enterprise Linux 9: all versions — fixed in 0:22.03.7-11.el9fdp, 0:22.06.0-273.el9fdp, 0:22.09.2-86.el9fdp, 0:22.12.1-107.el9fdp, 0:23.03.3-22.el9fdp, 0:23.06.4-26.el9fdp
Red Hat OpenShift Container Platform 4.18: all versions

How to fix

Upgrade to a fixed version: Red Hat Fast Datapath for Red Hat Enterprise Linux 8 0:22.03.7-11.el8fdp, 0:22.06.0-273.el8fdp, 0:22.09.2-86.el8fdp, 0:22.12.1-107.el8fdp; Red Hat Fast Datapath for Red Hat Enterprise Linux 9 0:22.03.7-11.el9fdp, 0:22.06.0-273.el9fdp, 0:22.09.2-86.el9fdp, 0:22.12.1-107.el9fdp. Check the vendor advisory for mitigations.

References

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