ubuntu-cve-2026-5265
Vulnerability from osv_ubuntu
Published
2026-04-20 00:00
Modified
2026-05-20 15:24
Summary
Details

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)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ovn-central",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-common",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-docker",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-host",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-ic",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          },
          {
            "binary_name": "ovn-ic-db",
            "binary_version": "20.03.2-0ubuntu0.20.04.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ovn",
        "purl": "pkg:deb/ubuntu/ovn@20.03.2-0ubuntu0.20.04.6?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.12.90~git20200107.c80e014d4-0ubuntu1",
        "2.12.90~git20200107.c80e014d4-0ubuntu2",
        "20.03.0~git20200212.9a4e68ec8-0ubuntu1",
        "20.03.0~git20200212.9a4e68ec8-0ubuntu3",
        "20.03.0-0ubuntu1",
        "20.03.1-0ubuntu1",
        "20.03.1-0ubuntu1.1",
        "20.03.1-0ubuntu1.2",
        "20.03.2-0ubuntu0.20.04.1",
        "20.03.2-0ubuntu0.20.04.2",
        "20.03.2-0ubuntu0.20.04.3",
        "20.03.2-0ubuntu0.20.04.4",
        "20.03.2-0ubuntu0.20.04.5",
        "20.03.2-0ubuntu0.20.04.6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ovn-central",
            "binary_version": "22.03.8-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "ovn-common",
            "binary_version": "22.03.8-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "22.03.8-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "ovn-docker",
            "binary_version": "22.03.8-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "ovn-host",
            "binary_version": "22.03.8-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "ovn-ic",
            "binary_version": "22.03.8-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "ovn-ic-db",
            "binary_version": "22.03.8-0ubuntu0.22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ovn",
        "purl": "pkg:deb/ubuntu/ovn@22.03.8-0ubuntu0.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "21.09.0~git20210922.6549e5842-0ubuntu1",
        "21.09.0~git20210922.6549e5842-0ubuntu2",
        "21.09.0-0ubuntu2",
        "21.12.0-0ubuntu1",
        "22.03.0~git20220218.ed81be7-0ubuntu1",
        "22.03.0-0ubuntu1",
        "22.03.2-0ubuntu0.22.04.1",
        "22.03.3-0ubuntu0.22.04.1",
        "22.03.3-0ubuntu0.22.04.2",
        "22.03.3-0ubuntu0.22.04.3",
        "22.03.3-0ubuntu0.22.04.5",
        "22.03.8-0ubuntu0.22.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ovn-central",
            "binary_version": "24.03.6-0ubuntu0.24.04.1"
          },
          {
            "binary_name": "ovn-common",
            "binary_version": "24.03.6-0ubuntu0.24.04.1"
          },
          {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "24.03.6-0ubuntu0.24.04.1"
          },
          {
            "binary_name": "ovn-docker",
            "binary_version": "24.03.6-0ubuntu0.24.04.1"
          },
          {
            "binary_name": "ovn-host",
            "binary_version": "24.03.6-0ubuntu0.24.04.1"
          },
          {
            "binary_name": "ovn-ic",
            "binary_version": "24.03.6-0ubuntu0.24.04.1"
          },
          {
            "binary_name": "ovn-ic-db",
            "binary_version": "24.03.6-0ubuntu0.24.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ovn",
        "purl": "pkg:deb/ubuntu/ovn@24.03.6-0ubuntu0.24.04.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "23.09.0-1",
        "23.09.0-2",
        "24.03.0~git20240205.ebb7076-1",
        "24.03.1-2ubuntu1",
        "24.03.1-2ubuntu3",
        "24.03.2-0ubuntu0.24.04.1",
        "24.03.2-0ubuntu0.24.04.2",
        "24.03.6-0ubuntu0.24.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ovn-central",
            "binary_version": "25.09.0-1"
          },
          {
            "binary_name": "ovn-common",
            "binary_version": "25.09.0-1"
          },
          {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "25.09.0-1"
          },
          {
            "binary_name": "ovn-docker",
            "binary_version": "25.09.0-1"
          },
          {
            "binary_name": "ovn-host",
            "binary_version": "25.09.0-1"
          },
          {
            "binary_name": "ovn-ic",
            "binary_version": "25.09.0-1"
          },
          {
            "binary_name": "ovn-ic-db",
            "binary_version": "25.09.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "ovn",
        "purl": "pkg:deb/ubuntu/ovn@25.09.0-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "25.03.0-1",
        "25.09.0~git20250813.23884f5-maysync1",
        "25.09.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ovn-central",
            "binary_version": "26.03.0-2"
          },
          {
            "binary_name": "ovn-common",
            "binary_version": "26.03.0-2"
          },
          {
            "binary_name": "ovn-controller-vtep",
            "binary_version": "26.03.0-2"
          },
          {
            "binary_name": "ovn-docker",
            "binary_version": "26.03.0-2"
          },
          {
            "binary_name": "ovn-host",
            "binary_version": "26.03.0-2"
          },
          {
            "binary_name": "ovn-ic",
            "binary_version": "26.03.0-2"
          },
          {
            "binary_name": "ovn-ic-db",
            "binary_version": "26.03.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ovn",
        "purl": "pkg:deb/ubuntu/ovn@26.03.0-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "25.09.0-1",
        "25.09.0-3",
        "26.03.0~git20260216.b543a88-2",
        "26.03.0-2"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-5265",
  "modified": "2026-05-20T15:24:32Z",
  "published": "2026-04-20T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-5265"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-5265"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-5265"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.