CVE-2026-5265 (GCVE-0-2026-5265)
Vulnerability from cvelistv5 – Published: 2026-04-24 12:25 – Updated: 2026-06-17 22:00
VLAI
EPSS
VEX
Title
Ovn: ovn: heap over-read in icmp error response generation
Summary
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.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-24 18:19 UTC
CWE
- CWE-130 - Improper Handling of Length Parameter Inconsistency
Assigner
References
13 references
Impacted products
12 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 10 |
Unaffected:
0:25.03.2-100.el10fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10::fastdatapath |
||
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 10 |
Unaffected:
0:25.09.2-103.el10fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10::fastdatapath |
||
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 8 |
Unaffected:
0:21.12.0-145.el8fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:8::fastdatapath |
||
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 8 |
Unaffected:
0:23.06.4-30.el8fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:8::fastdatapath |
||
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 |
Unaffected:
0:23.06.4-30.el9fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:9::fastdatapath |
||
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 |
Unaffected:
0:23.09.6-16.el9fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:9::fastdatapath |
||
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 |
Unaffected:
0:24.03.7-82.el9fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:9::fastdatapath |
||
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 |
Unaffected:
0:25.03.2-100.el9fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:9::fastdatapath |
||
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 |
Unaffected:
0:25.09.2-103.el9fdp , < *
(rpm)
cpe:/o:redhat:enterprise_linux:9::fastdatapath |
||
| Red Hat | Fast Datapath for RHEL 7 |
cpe:/o:redhat:enterprise_linux:7::fastdatapath
|
||
| Red Hat | Fast Datapath for RHEL 8 |
cpe:/o:redhat:enterprise_linux:8::fastdatapath
|
||
| Red Hat | Fast Datapath for RHEL 9 |
cpe:/o:redhat:enterprise_linux:9::fastdatapath
|
Date Public
2026-04-06 00:00
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"defaultStatus": "affected",
"packageName": "ovn22.09",
"product": "Fast Datapath for RHEL 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9::fastdatapath"
],
"defaultStatus": "affected",
"packageName": "ovn22.12",
"product": "Fast Datapath for RHEL 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9::fastdatapath"
],
"defaultStatus": "affected",
"packageName": "ovn23.03",
"product": "Fast Datapath for RHEL 9",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/o:redhat:enterprise_linux:9::fastdatapath"
],
"defaultStatus": "affected",
"packageName": "ovn24.09",
"product": "Fast Datapath for RHEL 9",
"vendor": "Red Hat"
}
],
"datePublic": "2026-04-06T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "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\u0027s 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."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Moderate"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
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"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H",
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},
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}
],
"problemTypes": [
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"description": "Improper Handling of Length Parameter Inconsistency",
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"type": "CWE"
}
]
}
],
"providerMetadata": {
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"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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},
"references": [
{
"name": "RHSA-2026:11694",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11694"
},
{
"name": "RHSA-2026:11695",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11695"
},
{
"name": "RHSA-2026:11696",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11696"
},
{
"name": "RHSA-2026:11698",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11698"
},
{
"name": "RHSA-2026:11700",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11700"
},
{
"name": "RHSA-2026:11701",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11701"
},
{
"name": "RHSA-2026:11702",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11702"
},
{
"name": "RHSA-2026:22110",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:22110"
},
{
"name": "RHSA-2026:22111",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:22111"
},
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
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},
{
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"tags": [
"issue-tracking",
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],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453458"
}
],
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{
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"time": "2026-03-24T00:00:00.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-04-06T00:00:00.000Z",
"value": "Made public."
}
],
"title": "Ovn: ovn: heap over-read in icmp error response generation",
"workarounds": [
{
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"value": "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."
}
],
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},
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},
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"dateReserved": "2026-03-31T17:33:09.225Z",
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},
"dataType": "CVE_RECORD",
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}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.