CVE-2026-5265 (GCVE-0-2026-5265)
Vulnerability from cvelistv5 – Published: 2026-04-24 12:25 – Updated: 2026-04-24 18:21
VLAI?
Title
Ovn: ovn: heap over-read in icmp error response generation - security issue
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)
CWE
- CWE-130 - Improper Handling of Length Parameter Inconsistency
Assigner
References
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Impacted products
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| Red Hat | Fast Datapath for RHEL 7 |
cpe:/o:redhat:enterprise_linux:7::fastdatapath |
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Date Public ?
2026-04-06 00:00
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(ip_tot_len for IPv4, ip6_plen for IPv6) without validating it against the actual packet buffer size. 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"cveMetadata": "{\"cveId\": \"CVE-2026-5265\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-24T18:21:26.388Z\", \"dateReserved\": \"2026-03-31T17:33:09.225Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-04-24T12:25:06.808Z\", \"assignerShortName\": \"redhat\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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