Red Hat Security Advisory: ovn23.09 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
The Red Hat ovn23.09 security advisory addresses two vulnerabilities in OVN, a system supporting virtual network abstraction. CVE-2026-5265 is a heap over-read vulnerability occurring during ICMP error response generation, categorized under CWE-130. CVE-2026-5367 involves information disclosure triggered by crafted DHCPv6 packets. Both vulnerabilities impact the Fast Datapath for Red Hat Enterprise Linux 9 across multiple architectures (x86_64, ppc64le, s390x, aarch64). Red Hat has issued updated packages to remediate these issues as detailed in advisory RHSA-2026:11698.
Potential Impact
The heap over-read vulnerability (CVE-2026-5265) could lead to potential memory safety issues during ICMP error response processing, which may cause application instability or unintended data exposure. The information disclosure vulnerability (CVE-2026-5367) allows an attacker to obtain sensitive information by sending crafted DHCPv6 packets. Both vulnerabilities pose a high security risk as rated by Red Hat, potentially affecting confidentiality and stability of virtual network operations.
Mitigation Recommendations
Red Hat has released updated ovn23.09 packages for Fast Datapath on Red Hat Enterprise Linux 9 that address these vulnerabilities. Users should apply the security update as described in Red Hat advisory RHSA-2026:11698 and the referenced update article (https://access.redhat.com/articles/11258). No additional mitigations are specified beyond applying the official patches. Patch status is confirmed as available.
Red Hat Security Advisory: ovn23.09 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.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Red Hat ovn23.09 security advisory addresses two vulnerabilities in OVN, a system supporting virtual network abstraction. CVE-2026-5265 is a heap over-read vulnerability occurring during ICMP error response generation, categorized under CWE-130. CVE-2026-5367 involves information disclosure triggered by crafted DHCPv6 packets. Both vulnerabilities impact the Fast Datapath for Red Hat Enterprise Linux 9 across multiple architectures (x86_64, ppc64le, s390x, aarch64). Red Hat has issued updated packages to remediate these issues as detailed in advisory RHSA-2026:11698.
Potential Impact
The heap over-read vulnerability (CVE-2026-5265) could lead to potential memory safety issues during ICMP error response processing, which may cause application instability or unintended data exposure. The information disclosure vulnerability (CVE-2026-5367) allows an attacker to obtain sensitive information by sending crafted DHCPv6 packets. Both vulnerabilities pose a high security risk as rated by Red Hat, potentially affecting confidentiality and stability of virtual network operations.
Mitigation Recommendations
Red Hat has released updated ovn23.09 packages for Fast Datapath on Red Hat Enterprise Linux 9 that address these vulnerabilities. Users should apply the security update as described in Red Hat advisory RHSA-2026:11698 and the referenced update article (https://access.redhat.com/articles/11258). No additional mitigations are specified beyond applying the official patches. Patch status is confirmed as 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-2026:11698
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-5367"]
- Cvss Version
- null
Threat ID: 6a19febde29bf47b500fd754
Added to database: 05/29/2026, 21:01:49 UTC
Last enriched: 06/28/2026, 00:51:19 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 64
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