Upstream information

CVE-2026-64368 at MITRE

Description

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

mm/slab: do not limit zeroing to orig_size when only red zoning is enabled

When init (zeroing) on allocation is requested, for kmalloc() we
generally have to zero the full object size even if a smaller size is
requested, in order to provide krealloc()'s __GFP_ZERO guarantees.

But if we track the requested size, krealloc() uses that information to
do the right thing, so we can zero only the requested size. With red
zoning also enabled, any extra size became part of the red zone, so it
must not be zeroed and thus we must zero only the requested size.

However the current check is imprecise, and will trigger also when only
SLAB_RED_ZONE is enabled without SLAB_STORE_USER (which enables tracking
the requested size). This means enabling red zoning alone can compromise
krealloc()'s __GFP_ZERO contract.

Fix this by using slub_debug_orig_size() instead, which is the exact
check for whether the requested size is tracked. We don't need to care
if red zoning is also enabled or not. Also update and expand the
comment accordingly.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail CNA (NVD) Linux Kernel CNA SUSE
Base Score 8.1 8.1 5.5
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network Network Local
Attack Complexity High High Low
Privileges Required None None Low
User Interaction None None None
Scope Unchanged Unchanged Unchanged
Confidentiality Impact High High None
Integrity Impact High High None
Availability Impact High High High
CVSSv3 Version 3.1 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: 1273997 [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 Affected
SUSE Linux Enterprise Desktop 15 SP7 kernel-source Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-default Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-source Affected
SUSE Linux Enterprise High Availability Extension 16.0 kernel-default Affected
SUSE Linux Enterprise High Availability Extension 16.0 kernel-source Affected
SUSE Linux Enterprise High Availability Extension 16.1 kernel-default Affected
SUSE Linux Enterprise High Availability Extension 16.1 kernel-source Affected
SUSE Linux Enterprise Live Patching 15 SP7 kernel-default Affected
SUSE Linux Enterprise Live Patching 15 SP7 kernel-source 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 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-default Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-source Affected
SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-default Affected
SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-source Affected
SUSE Linux Enterprise Module for Public Cloud 15 SP7 kernel-default Affected
SUSE Linux Enterprise Module for Public Cloud 15 SP7 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP7 kernel-source-rt Affected
SUSE Linux Enterprise Server 15 SP7 kernel-default Affected
SUSE Linux Enterprise Server 15 SP7 kernel-source Affected
SUSE Linux Enterprise Server 16.0 kernel-default Affected
SUSE Linux Enterprise Server 16.0 kernel-source In progress
SUSE Linux Enterprise Server 16.1 kernel-default Affected
SUSE Linux Enterprise Server 16.1 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-source Affected
SUSE Linux Enterprise Server for SAP applications 16.0 kernel-default Affected
SUSE Linux Enterprise Server for SAP applications 16.0 kernel-source In progress
SUSE Linux Enterprise Server for SAP applications 16.1 kernel-default Affected
SUSE Linux Enterprise Server for SAP applications 16.1 kernel-source Affected
SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-default Affected
SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-source Affected
SUSE Linux Micro 6.0 kernel-default Affected
SUSE Linux Micro 6.0 kernel-source Affected
SUSE Linux Micro 6.0 kernel-source-rt Affected
SUSE Linux Micro 6.1 kernel-default Affected
SUSE Linux Micro 6.1 kernel-source Affected
SUSE Linux Micro 6.1 kernel-source-rt Affected
SUSE Linux Micro 6.2 kernel-default Affected
SUSE Linux Micro 6.2 kernel-source In progress
SUSE Linux Micro Extras 6.0 kernel-default Affected
SUSE Linux Micro Extras 6.0 kernel-source Affected
SUSE Linux Micro Extras 6.0 kernel-source-rt Affected
SUSE Linux Micro Extras 6.1 kernel-default Affected
SUSE Linux Micro Extras 6.1 kernel-source Affected
SUSE Real Time Module 15 SP7 kernel-source-rt Affected
openSUSE Leap 16.0 kernel-source 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 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 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 Affected
SUSE Linux Enterprise Server 15 SP6-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP6-LTSS kernel-source 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 Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source 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 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 Affected

SUSE Timeline for this CVE

CVE page created: Sat Jul 25 13:39:02 2026
CVE page last modified: Fri Sep 4 11:42:13 2026