CVE-2026-5265

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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:11694
https://access.redhat.com/errata/RHSA-2026:11695
https://access.redhat.com/errata/RHSA-2026:11696
https://access.redhat.com/errata/RHSA-2026:11698
https://access.redhat.com/errata/RHSA-2026:11700
https://access.redhat.com/errata/RHSA-2026:11701
https://access.redhat.com/errata/RHSA-2026:11702
https://access.redhat.com/errata/RHSA-2026:22110
https://access.redhat.com/errata/RHSA-2026:22111
https://access.redhat.com/security/cve/CVE-2026-5265
https://bugzilla.redhat.com/show_bug.cgi?id=2453458
http://www.openwall.com/lists/oss-security/2026/04/20/2
http://www.openwall.com/lists/oss-security/2026/04/20/4

Configurations

No configuration.

History

No history.

Information

Published : 2026-04-24 13:16

Updated : 2026-06-17 10:58

NVD link : CVE-2026-5265

Mitre link : CVE-2026-5265

CVE.ORG link : CVE-2026-5265

JSON object : View

Products Affected

No product.

CWE

CWE-130

Improper Handling of Length Parameter Inconsistency

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"https://access.redhat.com/errata/RHSA-2026:22110", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:22111", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-5265", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453458", "source": "secalert@redhat.com"}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/20/2", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/20/4", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-130"}]}], "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'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."}], "lastModified": "2026-06-17T10:58:42.660", "sourceIdentifier": "secalert@redhat.com"}