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CVE Record

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

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.

HighCVSS 8.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Malformed DHCPv6 traffic from a virtual-machine port can make OVN disclose fragments of its working memory back to that port. This creates a serious confidentiality risk, especially in multi-tenant environments, although the supplied evidence establishes no data modification or service disruption.

Executive priority

Prioritize remediation for multi-tenant or untrusted-workload environments because successful exploitation could expose sensitive process memory across a trust boundary. Schedule accelerated patching and verify coverage. Emergency incident response is not justified solely by current evidence because active exploitation has not been reported.

Technical view

An inflated DHCPv6 Client ID length in a crafted SOLICIT packet can trigger an out-of-bounds heap read in ovn-controller. The resulting data may be returned through the attacker’s virtual port. CVSS 3.1 is 8.6, reflecting network reachability, low complexity, no authentication, high confidentiality impact, and changed scope.

Likely exposure

Exposure includes the listed OVN streams in Red Hat Fast Datapath for RHEL 8, 9, and 10, plus OpenShift Container Platform 4 using ovn23.06. Several older OVN streams are explicitly unaffected. Highest concern applies where untrusted tenants or workloads can send DHCPv6 traffic through OVN-managed ports.

Exploitation context

The supplied sources do not report active exploitation, and the CVE is not identified as CISA KEV. Exploitation requires sending a malformed DHCPv6 SOLICIT packet through a reachable virtual-machine port. The evidence does not identify a public proof of concept, observed campaign, or specific information exposed.

Researcher notes

The issue is classified as CWE-130 and stems from inadequate validation of a length parameter. The documented outcome is an out-of-bounds heap read with confidentiality impact; integrity and availability impacts are not established. The supplied evidence does not define leak size, repeatability, heap contents, detection signatures, or reliable exploitation conditions beyond crafted DHCPv6 traffic.

Mitigation direction

  • Inventory OVN streams and match installed releases against Red Hat's affected and unaffected product status.
  • Review and apply the applicable Red Hat security errata after compatibility testing and normal change control.
  • If updates cannot be applied promptly, obtain temporary mitigation guidance from Red Hat; none is specified in the supplied evidence.

Validation and detection

  • Record the platform, OVN stream, and installed package release on every relevant host or cluster.
  • Compare inventory results with Red Hat's CVE record and CSAF VEX affected-product entries.
  • Confirm applicable errata installed successfully and affected package releases are no longer deployed.
  • Review available telemetry for abnormal DHCPv6 SOLICIT traffic, without treating its absence as proof of safety.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-130: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-5367 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
3ADP providers
13Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N3.94redhat
8.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N3.94redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.6High
CVSS 3.1 vector shape for CVE-2026-5367Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Reported to Red Hat.

  3. Source timelineredhat

    Reported to Red Hat.

  4. ADP timelineredhat-SADP

    Made public.

  5. Source timelineredhat

    Made public.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPovn: OVN: Information disclosure via crafted DHCPv6 packets
other:Red Hat severity ratingcvssV3_1
  • 2026-04-07T08:10:53.507Z: Reported to Red Hat.
  • 2026-04-13T00:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatFast Datapath for Red Hat Enterprise Linux 10ovn25.03, 0:25.03.2-100.el10fdpaffected
Red HatFast Datapath for Red Hat Enterprise Linux 10ovn25.09, 0:25.09.2-103.el10fdpaffected
Red HatFast Datapath for Red Hat Enterprise Linux 8ovn-2021, 0:21.12.0-145.el8fdpaffected
Red HatFast Datapath for Red Hat Enterprise Linux 8ovn23.06, 0:23.06.4-30.el8fdpaffected
Red HatFast Datapath for Red Hat Enterprise Linux 9ovn23.06, 0:23.06.4-30.el9fdpaffected
Red HatFast Datapath for Red Hat Enterprise Linux 9ovn23.09, 0:23.09.6-16.el9fdpaffected
Red HatFast Datapath for Red Hat Enterprise Linux 9ovn24.03, 0:24.03.7-82.el9fdpaffected
Red HatFast Datapath for Red Hat Enterprise Linux 9ovn25.03, 0:25.03.2-100.el9fdpaffected
Red HatFast Datapath for Red Hat Enterprise Linux 9ovn25.09, 0:25.09.2-103.el9fdpaffected
Red HatFast Datapath for RHEL 8ovn2.11unaffected
Red HatFast Datapath for RHEL 8ovn2.12unaffected
Red HatFast Datapath for RHEL 8ovn2.13unaffected
Red HatFast Datapath for RHEL 8ovn23.03affected
Red HatFast Datapath for RHEL 9ovn-2021affected
Red HatFast Datapath for RHEL 9ovn23.03affected
Red HatRed Hat OpenShift Container Platform 4ovn22.06unaffected
Red HatRed Hat OpenShift Container Platform 4ovn22.09unaffected
Red HatRed Hat OpenShift Container Platform 4ovn22.12unaffected
Red HatRed Hat OpenShift Container Platform 4ovn23.03unaffected
Red HatRed Hat OpenShift Container Platform 4ovn23.06affected
Red HatRed Hat OpenShift Container Platform 4ovn23.09unaffected
Red HatRed Hat OpenShift Container Platform 4ovn24.03affected
Red HatRed Hat OpenShift Container Platform 4ovn24.09affected
Red HatRed Hat OpenShift Container Platform 4ovn25.03affected
Weakness

CWE details

CWE-130

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-130 · source CWE mapping

Improper Handling of Length Parameter Inconsistency

Improper Handling of Length Parameter Inconsistency represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs