Red Hat Security Advisory: ovn24.03 security update
OVN, the Open Virtual Network, is a system to support virtual network abstraction. OVN complements the existing capabilities of OVS to add native support for virtual network abstractions, such as virtual L2 and L3 overlays and security groups. Security Fix(es): * ovn: ovn: Heap Over-Read in ICMP Error Response Generation - security issue (CVE-2026-5265) * ovn: OVN: Information disclosure via crafted DHCPv6 packets (CVE-2026-5367) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
The advisory covers two security issues in OVN, a system that supports virtual network abstractions such as virtual L2 and L3 overlays and security groups. CVE-2026-5265 is a heap over-read vulnerability occurring during ICMP error response generation, categorized under CWE-130. CVE-2026-5367 allows information disclosure through specially crafted DHCPv6 packets. These vulnerabilities could potentially impact the integrity and confidentiality of network operations within affected Red Hat Fast Datapath environments. The advisory references updated ovn24.03 packages for Red Hat Enterprise Linux 9 on x86_64, ppc64le, s390x, and aarch64 architectures. No CVSS scores are provided in the advisory, but Red Hat rates the update as Important.
Potential Impact
The heap over-read vulnerability (CVE-2026-5265) may lead to memory safety issues during ICMP error response processing, potentially causing crashes or data leakage. The information disclosure vulnerability (CVE-2026-5367) could allow an attacker to obtain sensitive information by sending crafted DHCPv6 packets. Both vulnerabilities affect the OVN component of the Fast Datapath in Red Hat Enterprise Linux 9, which could impact virtual network abstraction and security group enforcement. There are no known exploits in the wild at the time of the advisory.
Mitigation Recommendations
Red Hat has released updated ovn24.03 packages for Fast Datapath on Red Hat Enterprise Linux 9 that address these vulnerabilities. Users should apply these official patches as described in the Red Hat advisory RHSA-2026:11700 and the referenced update article (https://access.redhat.com/articles/11258). No additional mitigations or workarounds are specified. Patch status is confirmed by the vendor advisory.
Red Hat Security Advisory: ovn24.03 security update
Description
OVN, the Open Virtual Network, is a system to support virtual network abstraction. OVN complements the existing capabilities of OVS to add native support for virtual network abstractions, such as virtual L2 and L3 overlays and security groups. Security Fix(es): * ovn: ovn: Heap Over-Read in ICMP Error Response Generation - security issue (CVE-2026-5265) * ovn: OVN: Information disclosure via crafted DHCPv6 packets (CVE-2026-5367) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers two security issues in OVN, a system that supports virtual network abstractions such as virtual L2 and L3 overlays and security groups. CVE-2026-5265 is a heap over-read vulnerability occurring during ICMP error response generation, categorized under CWE-130. CVE-2026-5367 allows information disclosure through specially crafted DHCPv6 packets. These vulnerabilities could potentially impact the integrity and confidentiality of network operations within affected Red Hat Fast Datapath environments. The advisory references updated ovn24.03 packages for Red Hat Enterprise Linux 9 on x86_64, ppc64le, s390x, and aarch64 architectures. No CVSS scores are provided in the advisory, but Red Hat rates the update as Important.
Potential Impact
The heap over-read vulnerability (CVE-2026-5265) may lead to memory safety issues during ICMP error response processing, potentially causing crashes or data leakage. The information disclosure vulnerability (CVE-2026-5367) could allow an attacker to obtain sensitive information by sending crafted DHCPv6 packets. Both vulnerabilities affect the OVN component of the Fast Datapath in Red Hat Enterprise Linux 9, which could impact virtual network abstraction and security group enforcement. There are no known exploits in the wild at the time of the advisory.
Mitigation Recommendations
Red Hat has released updated ovn24.03 packages for Fast Datapath on Red Hat Enterprise Linux 9 that address these vulnerabilities. Users should apply these official patches as described in the Red Hat advisory RHSA-2026:11700 and the referenced update article (https://access.redhat.com/articles/11258). No additional mitigations or workarounds are specified. Patch status is confirmed by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:11700
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-5367"]
- Cvss Version
- null
Threat ID: 6a19febde29bf47b500fd749
Added to database: 05/29/2026, 21:01:49 UTC
Last enriched: 06/28/2026, 00:51:07 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 66
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.