{"id":"UBUNTU-CVE-2026-5265","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.","modified":"2026-05-20T16:26:16.130268395Z","published":"2026-04-20T00:00:00Z","upstream":["CVE-2026-5265"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5265"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-5265"}],"affected":[{"package":{"name":"ovn","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/ovn?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":"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_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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"}},{"package":{"name":"ovn","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/ovn?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":"22.03.8-0ubuntu0.22.04.1"},{"binary_version":"22.03.8-0ubuntu0.22.04.1","binary_name":"ovn-common"},{"binary_name":"ovn-controller-vtep","binary_version":"22.03.8-0ubuntu0.22.04.1"},{"binary_version":"22.03.8-0ubuntu0.22.04.1","binary_name":"ovn-docker"},{"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"}},{"package":{"name":"ovn","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/ovn?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"24.03.6-0ubuntu0.24.04.1","binary_name":"ovn-central"},{"binary_version":"24.03.6-0ubuntu0.24.04.1","binary_name":"ovn-common"},{"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_version":"24.03.6-0ubuntu0.24.04.1","binary_name":"ovn-host"},{"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"}},{"package":{"name":"ovn","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/ovn?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["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_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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"}},{"package":{"name":"ovn","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/ovn?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["25.09.0-1","25.09.0-3","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_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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5265.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}