Upstream information

CVE-2026-34956 at MITRE

Description

A flaw was found in Open vSwitch. When Open vSwitch is configured with a conntrack flow using FTP helpers over the userspace datapath, a remote attacker can send a specially crafted FTP stream with an EPASV command exceeding 255 characters. This heap access error can lead to a crash, resulting in a Denial of Service (DoS) for the affected system.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail CNA (Red Hat) SUSE
Base Score 5.9 5.9
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network Network
Attack Complexity High High
Privileges Required None None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact None None
Integrity Impact None None
Availability Impact High High
CVSSv3 Version 3.1 3.1
CVSS v4 Scores
CVSS detail SUSE
Base Score 8.2
Vector CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Attack Vector Network
Attack Complexity High
Attack Requirements Present
Privileges Required None
User Interaction None
Vulnerable System Confidentiality Impact None
Vulnerable System Integrity Impact None
Vulnerable System Availability Impact High
Subsequent System Confidentiality Impact None
Subsequent System Integrity Impact None
Subsequent System Availability Impact None
CVSSv4 Version 4.0
SUSE Bugzilla entry: 1261273 [IN_PROGRESS]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Linux Enterprise High Performance Computing 15 SP7
SUSE Linux Enterprise Module for Server Applications 15 SP7
SUSE Linux Enterprise Server 15 SP7
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • libopenvswitch-3_5-0 >= 3.5.4-150700.41.15.1
  • libovn-25_03-0 >= 25.03.2-150700.41.15.1
  • openvswitch >= 3.5.4-150700.41.15.1
  • openvswitch-devel >= 3.5.4-150700.41.15.1
  • openvswitch-ipsec >= 3.5.4-150700.41.15.1
  • openvswitch-pki >= 3.5.4-150700.41.15.1
  • openvswitch-test >= 3.5.4-150700.41.15.1
  • openvswitch-vtep >= 3.5.4-150700.41.15.1
  • ovn >= 25.03.2-150700.41.15.1
  • ovn-central >= 25.03.2-150700.41.15.1
  • ovn-devel >= 25.03.2-150700.41.15.1
  • ovn-docker >= 25.03.2-150700.41.15.1
  • ovn-host >= 25.03.2-150700.41.15.1
  • ovn-vtep >= 25.03.2-150700.41.15.1
  • python3-openvswitch >= 3.5.4-150700.41.15.1
 Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP7-2026-1439
SUSE Linux Enterprise Micro 5.5
  • libopenvswitch-3_1-0 >= 3.1.7-150500.3.28.1
  • libovn-23_03-0 >= 23.03.3-150500.3.28.1
  • openvswitch3 >= 3.1.7-150500.3.28.1
  • openvswitch3-pki >= 3.1.7-150500.3.28.1
  • openvswitch3-vtep >= 3.1.7-150500.3.28.1
  • ovn3 >= 23.03.3-150500.3.28.1
  • ovn3-central >= 23.03.3-150500.3.28.1
  • ovn3-docker >= 23.03.3-150500.3.28.1
  • ovn3-host >= 23.03.3-150500.3.28.1
  • ovn3-vtep >= 23.03.3-150500.3.28.1
  • python3-ovs3 >= 3.1.7-150500.3.28.1
 Patchnames:
SUSE-SLE-Micro-5.5-2026-1440
SUSE Linux Enterprise Module for Package Hub 15 SP7
  • python3-openvswitch >= 3.5.4-150700.41.15.1
 Patchnames:
SUSE-SLE-Module-Packagehub-Subpackages-15-SP7-2026-1439
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5
  • libopenvswitch-2_11-0 >= 2.11.5-3.30.1
  • openvswitch >= 2.11.5-3.30.1
 Patchnames:
SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-1482
SUSE Linux Micro 6.0
  • libopenvswitch-3_1-0 >= 3.1.7-5.1
  • openvswitch >= 3.1.7-5.1
 Patchnames:
SUSE-SLE-Micro-6.0-678
openSUSE Tumbleweed
  • libopenvswitch-3_7-0 >= 3.7.1-33.1
  • libovn-26_03-0 >= 26.03.0-33.1
  • openvswitch >= 3.7.1-33.1
  • openvswitch-devel >= 3.7.1-33.1
  • openvswitch-doc >= 3.7.1-33.1
  • openvswitch-ipsec >= 3.7.1-33.1
  • openvswitch-pki >= 3.7.1-33.1
  • openvswitch-test >= 3.7.1-33.1
  • openvswitch-vtep >= 3.7.1-33.1
  • ovn >= 26.03.0-33.1
  • ovn-br-controller >= 3.7.1-33.1
  • ovn-central >= 26.03.0-33.1
  • ovn-devel >= 26.03.0-33.1
  • ovn-doc >= 26.03.0-33.1
  • ovn-docker >= 26.03.0-33.1
  • ovn-host >= 26.03.0-33.1
  • ovn-vtep >= 26.03.0-33.1
  • python3-openvswitch >= 3.7.1-33.1
 Patchnames:
openSUSE-Tumbleweed-2026-10534

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP7 openvswitch Released
SUSE Linux Enterprise Micro 5.5 openvswitch3 Released
SUSE Linux Enterprise Module for Package Hub 15 SP7 openvswitch Released
SUSE Linux Enterprise Module for Server Applications 15 SP7 openvswitch Released
SUSE Linux Enterprise Server 15 SP7 openvswitch Released
SUSE Linux Enterprise Server 16.0 openvswitch In progress
SUSE Linux Enterprise Server 16.1 openvswitch Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 openvswitch Released
SUSE Linux Enterprise Server for SAP applications 16.0 openvswitch In progress
SUSE Linux Enterprise Server for SAP applications 16.1 openvswitch Affected
SUSE Linux Micro 6.0 openvswitch Released
SUSE Linux Micro 6.1 openvswitch Affected
SUSE Linux Micro 6.2 openvswitch In progress
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4 openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP5 openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP5 openvswitch3 Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS openvswitch3 Affected
SUSE Linux Enterprise Module for Legacy 15 SP5 openvswitch Affected
SUSE Linux Enterprise Module for Server Applications 15 SP4 openvswitch Affected
SUSE Linux Enterprise Module for Server Applications 15 SP5 openvswitch3 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP6 openvswitch Affected
SUSE Linux Enterprise Server 12 SP5 openvswitch Affected
SUSE Linux Enterprise Server 12 SP5-LTSS openvswitch Affected
SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security openvswitch Released
SUSE Linux Enterprise Server 15 SP4 openvswitch Affected
SUSE Linux Enterprise Server 15 SP4-LTSS openvswitch Affected
SUSE Linux Enterprise Server 15 SP5 openvswitch Affected
SUSE Linux Enterprise Server 15 SP5 openvswitch3 Affected
SUSE Linux Enterprise Server 15 SP5-LTSS openvswitch Affected
SUSE Linux Enterprise Server 15 SP5-LTSS openvswitch3 Affected
SUSE Linux Enterprise Server 15 SP6 openvswitch Affected
SUSE Linux Enterprise Server 15 SP6-LTSS openvswitch Affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 openvswitch Released
SUSE Linux Enterprise Server for SAP Applications 15 SP6 openvswitch Affected
SUSE Manager Proxy 4.3 openvswitch Affected
SUSE Manager Proxy LTS 4.3 openvswitch Affected
SUSE Manager Retail Branch Server 4.3 openvswitch Affected
SUSE Manager Retail Branch Server LTS 4.3 openvswitch Affected
SUSE Manager Server 4.3 openvswitch Affected
SUSE Manager Server LTS 4.3 openvswitch Affected
Products past their end of life and not receiving proactive updates anymore.
HPE Helion OpenStack 8 openvswitch Not affected
SUSE CaaS Platform 4.0 openvswitch Affected
SUSE Enterprise Storage 6 openvswitch Affected
SUSE Enterprise Storage 7 openvswitch Affected
SUSE Enterprise Storage 7.1 openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP1 openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP2 openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS openvswitch Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS openvswitch3 Affected
SUSE Linux Enterprise High Performance Computing 15 SP6 openvswitch Affected
SUSE Linux Enterprise Module for Package Hub 15 SP1 openvswitch Affected
SUSE Linux Enterprise Module for Package Hub 15 SP2 openvswitch Affected
SUSE Linux Enterprise Module for Package Hub 15 SP3 openvswitch Affected
SUSE Linux Enterprise Module for Package Hub 15 SP4 openvswitch Affected
SUSE Linux Enterprise Module for Package Hub 15 SP5 openvswitch Affected
SUSE Linux Enterprise Module for Package Hub 15 SP6 openvswitch Affected
SUSE Linux Enterprise Module for Server Applications 15 SP1 openvswitch Affected
SUSE Linux Enterprise Module for Server Applications 15 SP2 openvswitch Affected
SUSE Linux Enterprise Module for Server Applications 15 SP3 openvswitch Affected
SUSE Linux Enterprise Real Time 15 SP2 openvswitch Affected
SUSE Linux Enterprise Real Time 15 SP3 openvswitch Affected
SUSE Linux Enterprise Real Time 15 SP4 openvswitch Affected
SUSE Linux Enterprise Server 12 SP3 openvswitch Not affected
SUSE Linux Enterprise Server 12 SP3-BCL openvswitch Not affected
SUSE Linux Enterprise Server 12 SP3-ESPOS openvswitch Not affected
SUSE Linux Enterprise Server 12 SP3-LTSS openvswitch Not affected
SUSE Linux Enterprise Server 12 SP4 openvswitch Affected
SUSE Linux Enterprise Server 12 SP4-ESPOS openvswitch Affected
SUSE Linux Enterprise Server 12 SP4-LTSS openvswitch Affected
SUSE Linux Enterprise Server 15 SP1 openvswitch Affected
SUSE Linux Enterprise Server 15 SP1-BCL openvswitch Affected
SUSE Linux Enterprise Server 15 SP1-LTSS openvswitch Affected
SUSE Linux Enterprise Server 15 SP2 openvswitch Affected
SUSE Linux Enterprise Server 15 SP2-BCL openvswitch Affected
SUSE Linux Enterprise Server 15 SP2-LTSS openvswitch Affected
SUSE Linux Enterprise Server 15 SP3 openvswitch Affected
SUSE Linux Enterprise Server 15 SP3-BCL openvswitch Affected
SUSE Linux Enterprise Server 15 SP3-LTSS openvswitch Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 openvswitch Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 openvswitch Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 openvswitch Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 openvswitch Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 openvswitch Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 openvswitch Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 openvswitch Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 openvswitch3 Affected
SUSE Manager Proxy 4.0 openvswitch Affected
SUSE Manager Proxy 4.1 openvswitch Affected
SUSE Manager Proxy 4.2 openvswitch Affected
SUSE Manager Retail Branch Server 4.0 openvswitch Affected
SUSE Manager Retail Branch Server 4.1 openvswitch Affected
SUSE Manager Retail Branch Server 4.2 openvswitch Affected
SUSE Manager Server 4.0 openvswitch Affected
SUSE Manager Server 4.1 openvswitch Affected
SUSE Manager Server 4.2 openvswitch Affected
SUSE OpenStack Cloud 8 openvswitch Not affected
SUSE OpenStack Cloud 9 openvswitch Affected
SUSE OpenStack Cloud Crowbar 8 openvswitch Not affected
SUSE OpenStack Cloud Crowbar 9 openvswitch Affected
openSUSE Leap 15.3 openvswitch Affected
openSUSE Leap 15.4 openvswitch Affected
openSUSE Leap 15.5 openvswitch Affected
openSUSE Leap 15.5 openvswitch3 Released
openSUSE Leap 15.6 openvswitch Released
openSUSE Leap 15.6 openvswitch3 Affected

SUSE Timeline for this CVE

CVE page created: Wed Apr 1 03:00:09 2026
CVE page last modified: Fri May 8 15:15:55 2026