Upstream information

CVE-2026-64531 at MITRE

Description

In the Linux kernel, the following vulnerability has been resolved:

net: openvswitch: reject oversized nested action attrs

Open vSwitch stores generated flow actions as nlattrs, whose nla_len
field is u16. Commit a1e64addf3ff ("net: openvswitch: remove
misbehaving actions length check") allowed the total sw_flow_actions
stream to grow beyond 64 KiB, which is valid, but also removed the last
guard preventing a generated nested action attribute from exceeding
U16_MAX.

An oversized generated container can thus be closed with a truncated
nla_len. A later dump or teardown then walks a structurally different
stream than the one that was validated. In particular, an oversized
nested CLONE/CT action may cause subsequent bytes in the generated
stream to be interpreted as independent actions.

Keep the larger total-action-stream behavior, but make nested action
close reject generated containers that do not fit in nla_len, and return
the error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and
CHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse
construction order before discarding failed wrappers, so resources copied
into the rejected tails are released before the wrappers are removed.

Most failed outer wrappers are discarded by truncating actions_len after
child resources have been released. CHECK_PKT_LEN also trims its parent
after branch resources are gone. SET/TUNNEL close failures unwind their
known tun_dst ownership directly, and SET_TO_MASKED has no external
ownership and truncates on close failure.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (NVD) Linux Kernel CNA
Base Score 7.8 7.8
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local Local
Attack Complexity Low Low
Privileges Required Low Low
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact High High
Availability Impact High High
CVSSv3 Version 3.1 3.1

Note from the SUSE Security Team on the kernel-default package

SUSE will no longer fix all CVEs in the Linux Kernel anymore, but declare some bug classes as won't fix. Please refer to TID 21496 for more details.

SUSE Bugzilla entry: 1272372 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Liberty Linux 10
  • kernel >= 6.12.0-211.46.1.el10_2
  • kernel-abi-stablelists >= 6.12.0-211.46.1.el10_2
  • kernel-core >= 6.12.0-211.46.1.el10_2
  • kernel-cross-headers >= 6.12.0-211.46.1.el10_2
  • kernel-debug >= 6.12.0-211.46.1.el10_2
  • kernel-debug-core >= 6.12.0-211.46.1.el10_2
  • kernel-debug-devel >= 6.12.0-211.46.1.el10_2
  • kernel-debug-devel-matched >= 6.12.0-211.46.1.el10_2
  • kernel-debug-modules >= 6.12.0-211.46.1.el10_2
  • kernel-debug-modules-core >= 6.12.0-211.46.1.el10_2
  • kernel-debug-modules-extra >= 6.12.0-211.46.1.el10_2
  • kernel-debug-uki-virt >= 6.12.0-211.46.1.el10_2
  • kernel-devel >= 6.12.0-211.46.1.el10_2
  • kernel-devel-matched >= 6.12.0-211.46.1.el10_2
  • kernel-doc >= 6.12.0-211.46.1.el10_2
  • kernel-headers >= 6.12.0-211.46.1.el10_2
  • kernel-modules >= 6.12.0-211.46.1.el10_2
  • kernel-modules-core >= 6.12.0-211.46.1.el10_2
  • kernel-modules-extra >= 6.12.0-211.46.1.el10_2
  • kernel-modules-extra-matched >= 6.12.0-211.46.1.el10_2
  • kernel-rt >= 6.12.0-211.46.1.el10_2
  • kernel-rt-core >= 6.12.0-211.46.1.el10_2
  • kernel-rt-debug >= 6.12.0-211.46.1.el10_2
  • kernel-rt-debug-core >= 6.12.0-211.46.1.el10_2
  • kernel-rt-debug-devel >= 6.12.0-211.46.1.el10_2
  • kernel-rt-debug-modules >= 6.12.0-211.46.1.el10_2
  • kernel-rt-debug-modules-core >= 6.12.0-211.46.1.el10_2
  • kernel-rt-debug-modules-extra >= 6.12.0-211.46.1.el10_2
  • kernel-rt-devel >= 6.12.0-211.46.1.el10_2
  • kernel-rt-modules >= 6.12.0-211.46.1.el10_2
  • kernel-rt-modules-core >= 6.12.0-211.46.1.el10_2
  • kernel-rt-modules-extra >= 6.12.0-211.46.1.el10_2
  • kernel-tools >= 6.12.0-211.46.1.el10_2
  • kernel-tools-libs >= 6.12.0-211.46.1.el10_2
  • kernel-tools-libs-devel >= 6.12.0-211.46.1.el10_2
  • kernel-uki-virt >= 6.12.0-211.46.1.el10_2
  • kernel-uki-virt-addons >= 6.12.0-211.46.1.el10_2
  • libperf >= 6.12.0-211.46.1.el10_2
  • perf >= 6.12.0-211.46.1.el10_2
  • python3-perf >= 6.12.0-211.46.1.el10_2
  • rtla >= 6.12.0-211.46.1.el10_2
  • rv >= 6.12.0-211.46.1.el10_2
 Patchnames:
RHSA-2026:53330 (x86_64)
SUSE Liberty Linux 9
  • kernel >= 5.14.0-687.38.1.el9_8
  • kernel-abi-stablelists >= 5.14.0-687.38.1.el9_8
  • kernel-core >= 5.14.0-687.38.1.el9_8
  • kernel-cross-headers >= 5.14.0-687.38.1.el9_8
  • kernel-debug >= 5.14.0-687.38.1.el9_8
  • kernel-debug-core >= 5.14.0-687.38.1.el9_8
  • kernel-debug-devel >= 5.14.0-687.38.1.el9_8
  • kernel-debug-devel-matched >= 5.14.0-687.38.1.el9_8
  • kernel-debug-modules >= 5.14.0-687.38.1.el9_8
  • kernel-debug-modules-core >= 5.14.0-687.38.1.el9_8
  • kernel-debug-modules-extra >= 5.14.0-687.38.1.el9_8
  • kernel-debug-uki-virt >= 5.14.0-687.38.1.el9_8
  • kernel-devel >= 5.14.0-687.38.1.el9_8
  • kernel-devel-matched >= 5.14.0-687.38.1.el9_8
  • kernel-doc >= 5.14.0-687.38.1.el9_8
  • kernel-headers >= 5.14.0-687.38.1.el9_8
  • kernel-modules >= 5.14.0-687.38.1.el9_8
  • kernel-modules-core >= 5.14.0-687.38.1.el9_8
  • kernel-modules-extra >= 5.14.0-687.38.1.el9_8
  • kernel-rt >= 5.14.0-687.38.1.el9_8
  • kernel-rt-core >= 5.14.0-687.38.1.el9_8
  • kernel-rt-debug >= 5.14.0-687.38.1.el9_8
  • kernel-rt-debug-core >= 5.14.0-687.38.1.el9_8
  • kernel-rt-debug-devel >= 5.14.0-687.38.1.el9_8
  • kernel-rt-debug-modules >= 5.14.0-687.38.1.el9_8
  • kernel-rt-debug-modules-core >= 5.14.0-687.38.1.el9_8
  • kernel-rt-debug-modules-extra >= 5.14.0-687.38.1.el9_8
  • kernel-rt-devel >= 5.14.0-687.38.1.el9_8
  • kernel-rt-modules >= 5.14.0-687.38.1.el9_8
  • kernel-rt-modules-core >= 5.14.0-687.38.1.el9_8
  • kernel-rt-modules-extra >= 5.14.0-687.38.1.el9_8
  • kernel-tools >= 5.14.0-687.38.1.el9_8
  • kernel-tools-libs >= 5.14.0-687.38.1.el9_8
  • kernel-tools-libs-devel >= 5.14.0-687.38.1.el9_8
  • kernel-uki-virt >= 5.14.0-687.38.1.el9_8
  • kernel-uki-virt-addons >= 5.14.0-687.38.1.el9_8
  • libperf >= 5.14.0-687.38.1.el9_8
  • perf >= 5.14.0-687.38.1.el9_8
  • python3-perf >= 5.14.0-687.38.1.el9_8
  • rtla >= 5.14.0-687.38.1.el9_8
  • rv >= 5.14.0-687.38.1.el9_8
 Patchnames:
RHSA-2026:53329 (x86_64)
openSUSE Tumbleweed
  • kernel-devel >= 7.1.7-1.1
  • kernel-macros >= 7.1.7-1.1
  • kernel-source >= 7.1.7-1.1
  • kernel-source-vanilla >= 7.1.7-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-11476

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 Desktop 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Desktop 15 SP7 kernel-source Not affected
SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-default Not affected
SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-source Not affected
SUSE Linux Enterprise High Availability Extension 16.0 kernel-default Not affected
SUSE Linux Enterprise High Availability Extension 16.0 kernel-source Not affected
SUSE Linux Enterprise High Availability Extension 16.1 kernel-default Not affected
SUSE Linux Enterprise High Availability Extension 16.1 kernel-source Not affected
SUSE Linux Enterprise Live Patching 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Live Patching 15 SP7 kernel-source Not affected
SUSE Linux Enterprise Micro 5.3 kernel-default Not affected
SUSE Linux Enterprise Micro 5.3 kernel-rt Not affected
SUSE Linux Enterprise Micro 5.3 kernel-source Not affected
SUSE Linux Enterprise Micro 5.3 kernel-source-rt Not affected
SUSE Linux Enterprise Micro 5.4 kernel-default Not affected
SUSE Linux Enterprise Micro 5.4 kernel-rt Not affected
SUSE Linux Enterprise Micro 5.4 kernel-source Not affected
SUSE Linux Enterprise Micro 5.4 kernel-source-rt Not affected
SUSE Linux Enterprise Micro 5.5 kernel-default Not affected
SUSE Linux Enterprise Micro 5.5 kernel-source Not affected
SUSE Linux Enterprise Micro 5.5 kernel-source-rt Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-source Not affected
SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-source Not affected
SUSE Linux Enterprise Module for Public Cloud 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Module for Public Cloud 15 SP7 kernel-source Not affected
SUSE Linux Enterprise Real Time 15 SP7 kernel-source-rt Not affected
SUSE Linux Enterprise Server 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Server 15 SP7 kernel-source Not affected
SUSE Linux Enterprise Server 16.0 kernel-source Not affected
SUSE Linux Enterprise Server 16.1 kernel-default Not affected
SUSE Linux Enterprise Server 16.1 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-source Not affected
SUSE Linux Enterprise Server for SAP applications 16.0 kernel-source Not affected
SUSE Linux Enterprise Server for SAP applications 16.1 kernel-default Not affected
SUSE Linux Enterprise Server for SAP applications 16.1 kernel-source Not affected
SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-default Not affected
SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-source Not affected
SUSE Linux Micro 6.0 kernel-default Not affected
SUSE Linux Micro 6.0 kernel-source Not affected
SUSE Linux Micro 6.0 kernel-source-rt Not affected
SUSE Linux Micro 6.1 kernel-default Not affected
SUSE Linux Micro 6.1 kernel-source Not affected
SUSE Linux Micro 6.1 kernel-source-rt Not affected
SUSE Linux Micro 6.2 kernel-default Not affected
SUSE Linux Micro 6.2 kernel-source Not affected
SUSE Linux Micro Extras 6.0 kernel-default Not affected
SUSE Linux Micro Extras 6.0 kernel-source Not affected
SUSE Linux Micro Extras 6.0 kernel-source-rt Not affected
SUSE Real Time Module 15 SP7 kernel-source-rt Not affected
openSUSE Leap 16.0 kernel-source Not affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-default Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-source Not affected
SUSE Linux Enterprise Live Patching 12 SP5 kernel-default Not affected
SUSE Linux Enterprise Live Patching 12 SP5 kernel-source Not affected
SUSE Linux Enterprise Live Patching 15 SP4 kernel-default Not affected
SUSE Linux Enterprise Live Patching 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Live Patching 15 SP5 kernel-default Not affected
SUSE Linux Enterprise Live Patching 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP6 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-source Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-source Not affected
SUSE Linux Enterprise Server 12 SP5 kernel-source Not affected
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP6 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP6-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP6-LTSS kernel-source Not affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-default Not affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-default Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source Not affected
Products past their end of life and not receiving proactive updates anymore.
SUSE CaaS Platform 4.0 kernel-source Not affected
SUSE Enterprise Storage 6 kernel-source Not affected
SUSE Enterprise Storage 7 kernel-source Not affected
SUSE Enterprise Storage 7.1 kernel-source Not affected
SUSE Linux Enterprise Desktop 11 SP4 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP5 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP6 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-source Not affected
SUSE Linux Enterprise Micro 5.0 kernel-default Not affected
SUSE Linux Enterprise Micro 5.1 kernel-default Not affected
SUSE Linux Enterprise Micro 5.2 kernel-default Not affected
SUSE Linux Enterprise Micro 5.2 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Real Time 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Real Time 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source Not affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source-rt Not affected
SUSE Linux Enterprise Real Time 15 SP5 kernel-source-rt Not affected
SUSE Linux Enterprise Server 11 SP4 kernel-source Not affected
SUSE Linux Enterprise Server 11 SP4-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1-BCL kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP2-BCL kernel-source Not affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP3 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP3-BCL kernel-source Not affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-source Not affected
SUSE Manager Proxy 4.0 kernel-source Not affected
SUSE Manager Proxy 4.1 kernel-source Not affected
SUSE Manager Proxy 4.2 kernel-source Not affected
SUSE Manager Proxy 4.3 kernel-source Not affected
SUSE Manager Proxy LTS 4.3 kernel-source Not affected
SUSE Manager Retail Branch Server 4.0 kernel-source Not affected
SUSE Manager Retail Branch Server 4.1 kernel-source Not affected
SUSE Manager Retail Branch Server 4.2 kernel-source Not affected
SUSE Manager Retail Branch Server 4.3 kernel-source Not affected
SUSE Manager Retail Branch Server LTS 4.3 kernel-source Not affected
SUSE Manager Server 4.0 kernel-source Not affected
SUSE Manager Server 4.1 kernel-source Not affected
SUSE Manager Server 4.2 kernel-source Not affected
SUSE Manager Server 4.3 kernel-source Not affected
SUSE Manager Server LTS 4.3 kernel-source Not affected
SUSE Real Time Module 15 SP4 kernel-source-rt Not affected
SUSE Real Time Module 15 SP5 kernel-source-rt Not affected
openSUSE Leap 15.3 kernel-source Not affected
openSUSE Leap 15.4 kernel-source Not affected
openSUSE Leap 15.4 kernel-source-rt Not affected
openSUSE Leap 15.5 kernel-source Not affected
openSUSE Leap 15.5 kernel-source-rt Not affected
openSUSE Leap 15.6 kernel-source Not affected

SUSE Timeline for this CVE

CVE page created: Tue Jul 28 13:38:33 2026
CVE page last modified: Tue Sep 1 12:02:38 2026