CVE-2026-5367: Ovn: ovn: information disclosure via crafted dhcpv6 packets

Severity: high (CVSS 8.6 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: 2026-04-24 · updated 2026-10-26
Weakness: CWE-130

Description

A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.

Affected products

Red Hat Fast Datapath for Red Hat Enterprise Linux 10: all versions — fixed in 0:25.03.2-100.el10fdp, 0:25.09.2-103.el10fdp
Red Hat Fast Datapath for Red Hat Enterprise Linux 8: all versions — fixed in 0:21.12.0-145.el8fdp, 0:23.06.4-30.el8fdp
Red Hat Fast Datapath for Red Hat Enterprise Linux 9: all versions — fixed in 0:23.06.4-30.el9fdp, 0:23.09.6-16.el9fdp, 0:24.03.7-82.el9fdp, 0:25.03.2-100.el9fdp, 0:25.09.2-103.el9fdp
Red Hat Fast Datapath for RHEL 8: all versions
Red Hat Fast Datapath for RHEL 9: all versions
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 10 0:25.03.2-100.el10fdp, 0:25.09.2-103.el10fdp; Red Hat Fast Datapath for Red Hat Enterprise Linux 8 0:21.12.0-145.el8fdp, 0:23.06.4-30.el8fdp; Red Hat Fast Datapath for Red Hat Enterprise Linux 9 0:23.06.4-30.el9fdp, 0:23.09.6-16.el9fdp, 0:24.03.7-82.el9fdp, 0:25.03.2-100.el9fdp. Check the vendor advisory for mitigations.

References

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