Improper Handling of Length Parameter Inconsistency Affecting ovn23.09-vtep package, versions <0:23.09.6-16.el9fdp


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.63% (50th percentile)

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  • Snyk IDSNYK-RHEL9-OVN2309VTEP-16198312
  • published24 Apr 2026
  • disclosed6 Apr 2026

Introduced: 6 Apr 2026

CVE-2026-5265  (opens in a new tab)
CWE-130  (opens in a new tab)

How to fix?

Upgrade RHEL:9 ovn23.09-vtep to version 0:23.09.6-16.el9fdp or higher.
This issue was patched in RHSA-2026:11698.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ovn23.09-vtep package and not the ovn23.09-vtep package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g., by hitting a reject ACL), causing ovn-controller to read heap memory beyond the valid packet data and include it in the ICMP response sent back to the VM.

CVSS Base Scores

version 3.1