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.
- BDU:2026-12871
- openSUSE-SU-2026:10956-1
- openSUSE-SU-2026:20972-1
- RHSA-2026:11694
- RHSA-2026:11695
- RHSA-2026:11696
- RHSA-2026:11698
- RHSA-2026:11700
- RHSA-2026:11701
- RHSA-2026:11702
- RHSA-2026:22110
- RHSA-2026:22111
- SUSE-SU-2026:22105-1
- SUSE-SU-2026:22145-1
- SUSE-SU-2026:22152-1
- SUSE-SU-2026:23188-1
- SUSE-SU-2026:2463-1
- SUSE-SU-2026:2475-1
- SUSE-SU-2026:2476-1
- SUSE-SU-2026:2481-1
- Published
- Apr 24, 2026
- Updated
- Aug 25, 2026
- EPSS
- 0.9% · 57th percentile
- CWE
- CWE-130
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Report tools
Action score
34
Monitor
Low priority for now.
- CVSS
- 34 / 40 · 8.6 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.9%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · redhat
- 8.6
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| enterprise linux | 10 | cpe:2.3:redhat:enterprise_linux:10 |
| enterprise linux | 8 | cpe:2.3:redhat:enterprise_linux:8 |
| enterprise linux | 9 | cpe:2.3:redhat:enterprise_linux:9 |
| openshift | 4 | cpe:2.3:redhat:openshift:4 |
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
Red Hat Fast Datapath for Red Hat Enterprise Linux 10
- 0:25.03.2-100.el10fdp and laternot affected · rpm
- 0:25.09.2-103.el10fdp and laternot affected · rpm
Red Hat Fast Datapath for Red Hat Enterprise Linux 8
- 0:21.12.0-145.el8fdp and laternot affected · rpm
- 0:23.06.4-30.el8fdp and laternot affected · rpm
Red Hat Fast Datapath for Red Hat Enterprise Linux 9
- 0:23.06.4-30.el9fdp and laternot affected · rpm
- 0:23.09.6-16.el9fdp and laternot affected · rpm
- 0:24.03.7-82.el9fdp and laternot affected · rpm
- 0:25.03.2-100.el9fdp and laternot affected · rpm
- 0:25.09.2-103.el9fdp and laternot affected · rpm
Red Hat Fast Datapath for RHEL 8
- all versionsunknown
- all versionsunknown
- all versionsunknown
- all versionsaffected
Red Hat Fast Datapath for RHEL 9
- all versionsaffected
- all versionsaffected
Red Hat Red Hat OpenShift Container Platform 4
- all versionsunknown
- all versionsunknown
- all versionsunknown
- all versionsunknown
- all versionsaffected
- all versionsunknown
- all versionsaffected
- all versionsaffected
- all versionsaffected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | ovn | all versions | — |
| Debian:14 | ovn | before 26.03.0-4 | 26.03.0-4 |
| openSUSE:Leap 16.0 | openvswitch | before 3.5.4-160000.4.1 | 3.5.4-160000.4.1 |
| openSUSE:Tumbleweed | openvswitch | before 3.7.1-34.1 | 3.7.1-34.1 |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03 | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03-central | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03-central-debuginfo | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03-debuginfo | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03-debugsource | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03-host | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03-host-debuginfo | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03-vtep | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.03-vtep-debuginfo | before 0:25.03.2-100.el10fdp | 0:25.03.2-100.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09 | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09-central | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09-central-debuginfo | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09-debuginfo | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09-debugsource | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09-host | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09-host-debuginfo | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09-vtep | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:10::fastdatapath | ovn25.09-vtep-debuginfo | before 0:25.09.2-103.el10fdp | 0:25.09.2-103.el10fdp |
| Red Hat:enterprise_linux:8::fastdatapath | ovn-2021 | before 0:21.12.0-145.el8fdp | 0:21.12.0-145.el8fdp |
| Red Hat:enterprise_linux:8::fastdatapath | ovn-2021-central | before 0:21.12.0-145.el8fdp | 0:21.12.0-145.el8fdp |
+68
Same product
red hat: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-5265Ovn: ovn: heap over-read in icmp error response generation26Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:ovn | 26.03.0-4 · Debian:14 | Package registry (OSV) |
| opensuse:openvswitch | 3.7.1-34.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:ovn-2021 | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn-2021-central | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn-2021-central-debuginfo | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn-2021-debuginfo | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn-2021-debugsource | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn-2021-host | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn-2021-host-debuginfo | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn-2021-vtep | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn-2021-vtep-debuginfo | 0:21.12.0-145.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn23.06 | 0:23.06.4-30.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn23.06-central | 0:23.06.4-30.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| red hat:ovn23.06-central-debuginfo | 0:23.06.4-30.el8fdp · Red Hat:enterprise_linux:8::fastdatapath | Package registry (OSV) |
| suse:openvswitch | 3.1.7-6.1 · SUSE:Linux Micro 6.0 | Package registry (OSV) |
| suse:openvswitch3 | 3.1.7-150500.3.31.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-52650 days apartOvn: ovn: heap over-read in icmp error response generation26Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-130 · Improper Handling of Length Parameter InconsistencyCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2026:11694
- access.redhat.com/errata/RHSA-2026:11695
- access.redhat.com/errata/RHSA-2026:11696
- access.redhat.com/errata/RHSA-2026:11698
- access.redhat.com/errata/RHSA-2026:11700
- access.redhat.com/errata/RHSA-2026:11701
- access.redhat.com/errata/RHSA-2026:11702
- access.redhat.com/errata/RHSA-2026:22110
- access.redhat.com/errata/RHSA-2026:22111
- access.redhat.com/security/cve/CVE-2026-5367
- bugzilla.redhat.com/show_bug.cgi?id=2455863
- www.openwall.com/lists/oss-security/2026/04/20/3
- www.openwall.com/lists/oss-security/2026/04/20/5
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5367.json
Vendor advisories and official records. Exploit/PoC links are deliberately left out.