CVE-2026-5265
6.5 MEDIUMWhen generating an ICMP Destination Unreachable or Packet Too Big response, the handler copies a portion of the original packet into the ...
Published: 2026-04-24 · Last updated: 2026-06-01
Severity and scoring
- CVSS
- 6.5 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
- CWE
- CWE-130
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-5265
- [Other]https://access.redhat.com/errata/RHSA-2026:11694
- [Other]https://access.redhat.com/errata/RHSA-2026:11695
- [Other]https://access.redhat.com/errata/RHSA-2026:11696
- [Other]https://access.redhat.com/errata/RHSA-2026:11698
- [Other]https://access.redhat.com/errata/RHSA-2026:11700
- [Other]https://access.redhat.com/errata/RHSA-2026:11701
- [Other]https://access.redhat.com/errata/RHSA-2026:11702
- [Other]https://access.redhat.com/errata/RHSA-2026:22110
- [Other]https://access.redhat.com/errata/RHSA-2026:22111
- [Other]https://access.redhat.com/security/cve/CVE-2026-5265
- [Other]https://bugzilla.redhat.com/show_bug.cgi?id=2453458
- [Other]http://www.openwall.com/lists/oss-security/2026/04/20/2
- [Other]http://www.openwall.com/lists/oss-security/2026/04/20/4
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