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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Fast Datapath for Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Fast Datapath for RHEL 7 | — | — |
| Red Hat | Fast Datapath for RHEL 8 | — | — |
| Red Hat | Fast Datapath for RHEL 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | ovn | No fix yet | — |
| Debian 12 | ovn | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ovn | No fix yet | — |
| Ubuntu 26.04 LTS | ovn | No fix yet | — |
| Ubuntu 25.10 | ovn | No fix yet | — |
| Ubuntu 24.04 LTS | ovn | No fix yet | — |
| Ubuntu 22.04 LTS | ovn | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | ovn | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | ovn25.03 +3 | 25.03.2-100.el10fdp | RHSA-2026:22110 |
| RHEL 10 | ovn25.09 +3 | 25.09.2-103.el10fdp | RHSA-2026:22111 |
| RHEL 9 | ovn23.06 +3 | 23.06.4-30.el9fdp | RHSA-2026:11696 |
| RHEL 9 | ovn23.09 +3 | 23.09.6-16.el9fdp | RHSA-2026:11698 |
| RHEL 9 | ovn24.03 +3 | 24.03.7-82.el9fdp | RHSA-2026:11700 |
| RHEL 9 | ovn25.03 +3 | 25.03.2-100.el9fdp | RHSA-2026:11701 |
| RHEL 9 | ovn25.09 +3 | 25.09.2-103.el9fdp | RHSA-2026:11702 |
| RHEL 8 | ovn-2021 +3 | 21.12.0-145.el8fdp | RHSA-2026:11694 |
| RHEL 8 | ovn23.06 +3 | 23.06.4-30.el8fdp | RHSA-2026:11695 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | openvswitch | 3.5.4-150700.41.18.1 | SUSE-SU-2026:2463-1 |
| SLES 15 SP6 | openvswitch | 3.1.7-150600.33.15.1 | SUSE-SU-2026:2475-1 |
| SLES 15 SP5 | openvswitch | 2.14.2-150400.24.35.1 | SUSE-SU-2026:2481-1 |
| SLES 15 SP5 | openvswitch3 | 3.1.7-150500.3.31.1 | SUSE-SU-2026:2476-1 |
| SLES 15 SP4 | openvswitch | 2.14.2-150400.24.35.1 | SUSE-SU-2026:2481-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | openvswitch | 3.5.4-160000.4.1 | SUSE-SU-2026:22152-1 |
| SLES for SAP 15 SP6 | openvswitch | 3.1.7-150600.33.15.1 | SUSE-SU-2026:2475-1 |
| SLES for SAP 15 SP5 | openvswitch | 2.14.2-150400.24.35.1 | SUSE-SU-2026:2481-1 |
| SLES for SAP 15 SP5 | openvswitch3 | 3.1.7-150500.3.31.1 | SUSE-SU-2026:2476-1 |
| SLES for SAP 15 SP4 | openvswitch | 2.14.2-150400.24.35.1 | SUSE-SU-2026:2481-1 |
| SLES 16.0 | openvswitch | 3.5.4-160000.4.1 | SUSE-SU-2026:22152-1 |
| SLE Micro 6.2 | openvswitch | 3.5.4-160000.4.1 | SUSE-SU-2026:22145-1 |
| SLE Micro 6.1 | openvswitch | 3.1.7-slfo.1.1_4.1 | SUSE-SU-2026:23188-1 |
| SLE Micro 6.0 | openvswitch | 3.1.7-6.1 | SUSE-SU-2026:22105-1 |
| SLE Micro 5.5 | openvswitch3 | 3.1.7-150500.3.31.1 | SUSE-SU-2026:2476-1 |
| SLE HPC 15 SP5 | openvswitch3 | 3.1.7-150500.3.31.1 | SUSE-SU-2026:2476-1 |
| SLE HPC 15 SP4 | openvswitch | 2.14.2-150400.24.35.1 | SUSE-SU-2026:2481-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openvswitch | 3.7.1-34.1 | openSUSE-SU-2026:10956-1 |
| openSUSE Leap 16.0 | openvswitch | 3.5.4-160000.4.1 | openSUSE-SU-2026:20972-1 |
Advisories 20
- SUSE-SU-2026:23188-1 Security update for openvswitch SUSE / openSUSE Security Updates · Aug 26, 2026
- WID-SEC-2026-1315 Fast Datapath für Red Hat Enterprise Linux (ovn): Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 24, 2026
- RHSA-2026:22111 Red Hat Security Advisory: ovn25.09 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2026:22110 Red Hat Security Advisory: ovn25.03 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2026:11702 Red Hat Security Advisory: ovn25.09 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2026:11701 Red Hat Security Advisory: ovn25.03 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2026:11700 Red Hat Security Advisory: ovn24.03 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2026:11696 Red Hat Security Advisory: ovn23.06 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2026:11698 Red Hat Security Advisory: ovn23.09 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2026:11695 Red Hat Security Advisory: ovn23.06 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2026:11694 Red Hat Security Advisory: ovn-2021 security update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- SUSE-SU-2026:22152-1 Security update for openvswitch SUSE / openSUSE Security Updates · Jun 24, 2026
- openSUSE-SU-2026:20972-1 Security update for openvswitch SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:2481-1 Security update for openvswitch SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:2475-1 Security update for openvswitch SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:2476-1 Security update for openvswitch3 SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:2463-1 Security update for openvswitch SUSE / openSUSE Security Updates · Jun 20, 2026
- SUSE-SU-2026:22145-1 Security update for openvswitch SUSE / openSUSE Security Updates · Jun 19, 2026
- SUSE-SU-2026:22105-1 Security update for openvswitch SUSE / openSUSE Security Updates · Jun 17, 2026
- openSUSE-SU-2026:10956-1 libopenvswitch-3_7-0-3.7.1-34.1 on GA media SUSE / openSUSE Security Updates · Jun 5, 2026
References
- RHSA-2026:11694 vendor-advisory
- RHSA-2026:11695 vendor-advisory
- RHSA-2026:11696 vendor-advisory
- RHSA-2026:11698 vendor-advisory
- RHSA-2026:11700 vendor-advisory
- RHSA-2026:11701 vendor-advisory
- RHSA-2026:11702 vendor-advisory
- RHSA-2026:22110 vendor-advisory
- RHSA-2026:22111 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-5265 vdb-entry
- RHBZ#2453458 issue-tracking