CyberSecBulletin
CVE-2026-5367NVD status: Awaiting Analysis

Fast Datapath for Red Hat Enterprise Linux 10: Improper Handling of Length Parameter Inconsistency

Published Updated By the CyberSecBulletin desk

CVE-2026-5367 is a high-severity improper handling of length parameter inconsistency vulnerability in Fast Datapath for Red Hat Enterprise Linux 10 from Red Hat, with a CVSS 3.1 base score of 8.6 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.87% chance of exploitation within 30 days, higher than 59% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of Fast Datapath for Red Hat Enterprise Linux 10 you run against the affected versions below, and install the vendor's latest release.
  2. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Red HatFast Datapath for Red Hat Enterprise Linux 10Not specified in the recordNot stated
Red HatFast Datapath for Red Hat Enterprise Linux 8Not specified in the recordNot stated
Red HatFast Datapath for Red Hat Enterprise Linux 9Not specified in the recordNot stated
Red HatFast Datapath for RHEL 8Not specified in the recordNot stated
Red HatFast Datapath for RHEL 9Not specified in the recordNot stated
Red HatRed Hat OpenShift Container Platform 4Not specified in the recordNot stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
ChangedThe attack can reach beyond the vulnerable component into other systems.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N. Scored by CNA (redhat.com).

Scoring systemScoreSeverityScored by
CVSS 3.18.6HighCNA (redhat.com)
CVSS 3.18.6HighCNA

Official 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Handling of Length Parameter Inconsistency

The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.

How developers prevent this class of flaw

  • When processing structured incoming data containing a size field followed by raw data, ensure that you identify and resolve any inconsistencies between the size field and the actual size of the data.
  • Do not let the user control the size of the buffer.
  • Validate that the length of the user-supplied data is consistent with the buffer size.

More Improper Handling of Length Parameter Inconsistency vulnerabilities (CWE-130)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Improper Handling of Length Parameter Inconsistency vulnerabilities

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