UBUNTU-CVE-2026-5265

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Source
https://ubuntu.com/security/CVE-2026-5265
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5265
Upstream
  • CVE-2026-5265
Published
2026-04-20T00:00:00Z
Modified
2026-05-20T16:26:16.130268395Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
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 (iptotlen 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.

References

Affected packages

Ubuntu:20.04:LTS / ovn

Package

Name
ovn
Purl
pkg:deb/ubuntu/ovn?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.12.90~git20200107.c80e014d4-0ubuntu1
2.12.90~git20200107.c80e014d4-0ubuntu2
20.*
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": "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"

Ubuntu:22.04:LTS / ovn

Package

Name
ovn
Purl
pkg:deb/ubuntu/ovn?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

21.*
21.09.0~git20210922.6549e5842-0ubuntu1
21.09.0~git20210922.6549e5842-0ubuntu2
21.09.0-0ubuntu2
21.12.0-0ubuntu1
22.*
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": "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"

Ubuntu:24.04:LTS / ovn

Package

Name
ovn
Purl
pkg:deb/ubuntu/ovn?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

23.*
23.09.0-1
23.09.0-2
24.*
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": "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"

Ubuntu:25.10 / ovn

Package

Name
ovn
Purl
pkg:deb/ubuntu/ovn?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

25.*
25.03.0-1
25.09.0~git20250813.23884f5-maysync1
25.09.0-1

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"

Ubuntu:26.04:LTS / ovn

Package

Name
ovn
Purl
pkg:deb/ubuntu/ovn?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

25.*
25.09.0-1
25.09.0-3
26.*
26.03.0~git20260216.b543a88-2
26.03.0-2

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"