Ovn: ovn: heap over-read in icmp error response generation - security issue
Summary
| CVE | CVE-2026-5265 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-24 13:16:21 UTC |
| Updated | 2026-06-01 04:16:23 UTC |
| Description | When generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ICMP error body using the IP header's self-declared total length (ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. A VM can send a short packet with an inflated IP length field that triggers an ICMP error (e.g., by hitting a reject ACL), causing ovn-controller to read heap memory beyond the valid packet data and include it in the ICMP response sent back to the VM. |
Risk And Classification
Primary CVSS: v3.1 6.5 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
EPSS: 0.000400000 probability, percentile 0.122010000 (date 2026-06-03)
Problem Types: CWE-130 | CWE-130 Improper Handling of Length Parameter Inconsistency
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H |
| 3.1 | CNA | CVSS | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
LowIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 10 | unaffected 0:25.03.2-100.el10fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 10 | unaffected 0:25.09.2-103.el10fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 8 | unaffected 0:21.12.0-145.el8fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 8 | unaffected 0:23.06.4-30.el8fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 9 | unaffected 0:23.06.4-30.el9fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 9 | unaffected 0:23.09.6-16.el9fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 9 | unaffected 0:24.03.7-82.el9fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 9 | unaffected 0:25.03.2-100.el9fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For Red Hat Enterprise Linux 9 | unaffected 0:25.09.2-103.el9fdp * rpm | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 7 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 7 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 7 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 8 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 8 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 8 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 8 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 8 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 8 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 8 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 8 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 9 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 9 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 9 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 9 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 9 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 9 | Not specified | Not specified |
| CNA | Red Hat | Fast Datapath For RHEL 9 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:11695 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:11702 | [email protected] | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/04/20/2 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| access.redhat.com/errata/RHSA-2026:11694 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:11698 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:11700 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:11696 | [email protected] | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/04/20/4 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| access.redhat.com/errata/RHSA-2026:11701 | [email protected] | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-5265 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22111 | [email protected] | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:22110 | [email protected] | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-03-24T00:00:00.000Z | Reported to Red Hat. |
| CNA | 2026-04-06T00:00:00.000Z | Made public. |
Workarounds
CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
There are currently no legacy QID mappings associated with this CVE.