Red Hat Security Advisory: ovn25.09 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
OVN (Open Virtual Network) in the ovn25.03 package for Red Hat Enterprise Linux Fast Datapath 10 contains two security flaws. CVE-2026-5265 is a heap over-read vulnerability occurring during ICMP error response generation, which could lead to denial of service. CVE-2026-5367 allows information disclosure through specially crafted DHCPv6 packets. Red Hat has issued an important security advisory (RHSA-2026:22110) providing updated packages that fix these issues. The advisory covers multiple architectures including x86_64, ppc64le, s390x, and aarch64. The update is rated with a high severity impact and addresses these vulnerabilities to prevent potential exploitation.
Potential Impact
The heap over-read vulnerability (CVE-2026-5265) may cause denial of service conditions due to improper memory handling in ICMP error response generation. The information disclosure vulnerability (CVE-2026-5367) could allow an attacker to gain unauthorized access to sensitive information via crafted DHCPv6 packets. Both vulnerabilities affect network components of OVN, potentially impacting virtual network abstraction and security. Red Hat rates the overall impact as important with a high severity level, indicating significant risk if unpatched.
Mitigation Recommendations
Red Hat has released updated ovn25.03 packages for Red Hat Enterprise Linux Fast Datapath 10 that address these vulnerabilities. Users should apply the security update as detailed in Red Hat advisory RHSA-2026:22110 and the referenced article https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the official update. Patch status is confirmed by the vendor advisory, indicating an official fix is available.
Red Hat Security Advisory: ovn25.09 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.
CVSS v3.1
Score 6.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
OVN (Open Virtual Network) in the ovn25.03 package for Red Hat Enterprise Linux Fast Datapath 10 contains two security flaws. CVE-2026-5265 is a heap over-read vulnerability occurring during ICMP error response generation, which could lead to denial of service. CVE-2026-5367 allows information disclosure through specially crafted DHCPv6 packets. Red Hat has issued an important security advisory (RHSA-2026:22110) providing updated packages that fix these issues. The advisory covers multiple architectures including x86_64, ppc64le, s390x, and aarch64. The update is rated with a high severity impact and addresses these vulnerabilities to prevent potential exploitation.
Potential Impact
The heap over-read vulnerability (CVE-2026-5265) may cause denial of service conditions due to improper memory handling in ICMP error response generation. The information disclosure vulnerability (CVE-2026-5367) could allow an attacker to gain unauthorized access to sensitive information via crafted DHCPv6 packets. Both vulnerabilities affect network components of OVN, potentially impacting virtual network abstraction and security. Red Hat rates the overall impact as important with a high severity level, indicating significant risk if unpatched.
Mitigation Recommendations
Red Hat has released updated ovn25.03 packages for Red Hat Enterprise Linux Fast Datapath 10 that address these vulnerabilities. Users should apply the security update as detailed in Red Hat advisory RHSA-2026:22110 and the referenced article https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the official update. Patch status is confirmed by the vendor advisory, indicating an official fix is available.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:11702
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-5367"]
- Cvss Version
- 3.1
Threat ID: 6a19febde29bf47b500fd72f
Added to database: 05/29/2026, 21:01:49 UTC
Last enriched: 06/28/2026, 00:14:03 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 231
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