Upstream information

CVE-2026-68388 at MITRE

Description

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

smb/client: handle overlapping allocated ranges in fallocate

smb3_simple_fallocate_range() can skip holes when an allocated range
returned by the server starts before the current fallocate offset. The
skipped hole is not zero-filled, but fallocate still returns success. A
later write to that hole may therefore fail with ENOSPC.

The function queries allocated ranges so that it can preserve existing
contents and write zeroes only into holes. However, the server may return
a range that starts before the current fallocate offset.

For example, assume the fallocate request is [100, 400) and the only
allocated range returned by the server is [0, 200):

Request: [100, 400)
Server range: [ 0, 200) allocated

Correct:
[100, 200) allocated data, skip
[200, 400) hole, zero-fill

Current:
[100, 300) skipped
[300, 400) zero-filled afterwards

The current code adds the full server range length, 200, to the current
offset 100 and moves to 300. As a result, the hole in [200, 300) is
skipped without being zero-filled.

Fix this by advancing only over the part of the allocated range that
overlaps the current fallocate offset. Ignore ranges that end before the
current offset and reject ranges whose end offset overflows.

This also prevents a malformed range length from causing an out-of-bounds
zero-buffer read.

Other Security Trackers

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (NVD) Linux Kernel CNA SUSE
Base Score 9.8 9.8 5
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:H
Attack Vector Network Network Local
Attack Complexity Low Low High
Privileges Required None None Low
User Interaction None None Required
Scope Unchanged Unchanged Unchanged
Confidentiality Impact High High Low
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: 1274902 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Liberty Linux 10
  • kernel >= 6.12.0-211.49.1.el10_2
  • kernel-abi-stablelists >= 6.12.0-211.49.1.el10_2
  • kernel-core >= 6.12.0-211.49.1.el10_2
  • kernel-cross-headers >= 6.12.0-211.49.1.el10_2
  • kernel-debug >= 6.12.0-211.49.1.el10_2
  • kernel-debug-core >= 6.12.0-211.49.1.el10_2
  • kernel-debug-devel >= 6.12.0-211.49.1.el10_2
  • kernel-debug-devel-matched >= 6.12.0-211.49.1.el10_2
  • kernel-debug-modules >= 6.12.0-211.49.1.el10_2
  • kernel-debug-modules-core >= 6.12.0-211.49.1.el10_2
  • kernel-debug-modules-extra >= 6.12.0-211.49.1.el10_2
  • kernel-debug-uki-virt >= 6.12.0-211.49.1.el10_2
  • kernel-devel >= 6.12.0-211.49.1.el10_2
  • kernel-devel-matched >= 6.12.0-211.49.1.el10_2
  • kernel-doc >= 6.12.0-211.49.1.el10_2
  • kernel-headers >= 6.12.0-211.49.1.el10_2
  • kernel-modules >= 6.12.0-211.49.1.el10_2
  • kernel-modules-core >= 6.12.0-211.49.1.el10_2
  • kernel-modules-extra >= 6.12.0-211.49.1.el10_2
  • kernel-modules-extra-matched >= 6.12.0-211.49.1.el10_2
  • kernel-rt >= 6.12.0-211.49.1.el10_2
  • kernel-rt-core >= 6.12.0-211.49.1.el10_2
  • kernel-rt-debug >= 6.12.0-211.49.1.el10_2
  • kernel-rt-debug-core >= 6.12.0-211.49.1.el10_2
  • kernel-rt-debug-devel >= 6.12.0-211.49.1.el10_2
  • kernel-rt-debug-modules >= 6.12.0-211.49.1.el10_2
  • kernel-rt-debug-modules-core >= 6.12.0-211.49.1.el10_2
  • kernel-rt-debug-modules-extra >= 6.12.0-211.49.1.el10_2
  • kernel-rt-devel >= 6.12.0-211.49.1.el10_2
  • kernel-rt-modules >= 6.12.0-211.49.1.el10_2
  • kernel-rt-modules-core >= 6.12.0-211.49.1.el10_2
  • kernel-rt-modules-extra >= 6.12.0-211.49.1.el10_2
  • kernel-tools >= 6.12.0-211.49.1.el10_2
  • kernel-tools-libs >= 6.12.0-211.49.1.el10_2
  • kernel-tools-libs-devel >= 6.12.0-211.49.1.el10_2
  • kernel-uki-virt >= 6.12.0-211.49.1.el10_2
  • kernel-uki-virt-addons >= 6.12.0-211.49.1.el10_2
  • libperf >= 6.12.0-211.49.1.el10_2
  • perf >= 6.12.0-211.49.1.el10_2
  • python3-perf >= 6.12.0-211.49.1.el10_2
  • rtla >= 6.12.0-211.49.1.el10_2
  • rv >= 6.12.0-211.49.1.el10_2
 Patchnames:
RHSA-2026:57251 (x86_64)
SUSE Liberty Linux 8
  • bpftool >= 4.18.0-553.157.1.el8_10
  • kernel >= 4.18.0-553.157.1.el8_10
  • kernel-abi-stablelists >= 4.18.0-553.157.1.el8_10
  • kernel-core >= 4.18.0-553.157.1.el8_10
  • kernel-cross-headers >= 4.18.0-553.157.1.el8_10
  • kernel-debug >= 4.18.0-553.157.1.el8_10
  • kernel-debug-core >= 4.18.0-553.157.1.el8_10
  • kernel-debug-devel >= 4.18.0-553.157.1.el8_10
  • kernel-debug-modules >= 4.18.0-553.157.1.el8_10
  • kernel-debug-modules-extra >= 4.18.0-553.157.1.el8_10
  • kernel-devel >= 4.18.0-553.157.1.el8_10
  • kernel-doc >= 4.18.0-553.157.1.el8_10
  • kernel-headers >= 4.18.0-553.157.1.el8_10
  • kernel-modules >= 4.18.0-553.157.1.el8_10
  • kernel-modules-extra >= 4.18.0-553.157.1.el8_10
  • kernel-tools >= 4.18.0-553.157.1.el8_10
  • kernel-tools-libs >= 4.18.0-553.157.1.el8_10
  • kernel-tools-libs-devel >= 4.18.0-553.157.1.el8_10
  • perf >= 4.18.0-553.157.1.el8_10
  • python3-perf >= 4.18.0-553.157.1.el8_10
 Patchnames:
RHSA-2026:57253 (x86_64)
SUSE Liberty Linux 9
  • kernel >= 5.14.0-687.41.1.el9_8
  • kernel-abi-stablelists >= 5.14.0-687.41.1.el9_8
  • kernel-core >= 5.14.0-687.41.1.el9_8
  • kernel-cross-headers >= 5.14.0-687.41.1.el9_8
  • kernel-debug >= 5.14.0-687.41.1.el9_8
  • kernel-debug-core >= 5.14.0-687.41.1.el9_8
  • kernel-debug-devel >= 5.14.0-687.41.1.el9_8
  • kernel-debug-devel-matched >= 5.14.0-687.41.1.el9_8
  • kernel-debug-modules >= 5.14.0-687.41.1.el9_8
  • kernel-debug-modules-core >= 5.14.0-687.41.1.el9_8
  • kernel-debug-modules-extra >= 5.14.0-687.41.1.el9_8
  • kernel-debug-uki-virt >= 5.14.0-687.41.1.el9_8
  • kernel-devel >= 5.14.0-687.41.1.el9_8
  • kernel-devel-matched >= 5.14.0-687.41.1.el9_8
  • kernel-doc >= 5.14.0-687.41.1.el9_8
  • kernel-headers >= 5.14.0-687.41.1.el9_8
  • kernel-modules >= 5.14.0-687.41.1.el9_8
  • kernel-modules-core >= 5.14.0-687.41.1.el9_8
  • kernel-modules-extra >= 5.14.0-687.41.1.el9_8
  • kernel-rt >= 5.14.0-687.41.1.el9_8
  • kernel-rt-core >= 5.14.0-687.41.1.el9_8
  • kernel-rt-debug >= 5.14.0-687.41.1.el9_8
  • kernel-rt-debug-core >= 5.14.0-687.41.1.el9_8
  • kernel-rt-debug-devel >= 5.14.0-687.41.1.el9_8
  • kernel-rt-debug-modules >= 5.14.0-687.41.1.el9_8
  • kernel-rt-debug-modules-core >= 5.14.0-687.41.1.el9_8
  • kernel-rt-debug-modules-extra >= 5.14.0-687.41.1.el9_8
  • kernel-rt-devel >= 5.14.0-687.41.1.el9_8
  • kernel-rt-modules >= 5.14.0-687.41.1.el9_8
  • kernel-rt-modules-core >= 5.14.0-687.41.1.el9_8
  • kernel-rt-modules-extra >= 5.14.0-687.41.1.el9_8
  • kernel-tools >= 5.14.0-687.41.1.el9_8
  • kernel-tools-libs >= 5.14.0-687.41.1.el9_8
  • kernel-tools-libs-devel >= 5.14.0-687.41.1.el9_8
  • kernel-uki-virt >= 5.14.0-687.41.1.el9_8
  • kernel-uki-virt-addons >= 5.14.0-687.41.1.el9_8
  • libperf >= 5.14.0-687.41.1.el9_8
  • perf >= 5.14.0-687.41.1.el9_8
  • python3-perf >= 5.14.0-687.41.1.el9_8
  • rtla >= 5.14.0-687.41.1.el9_8
  • rv >= 5.14.0-687.41.1.el9_8
 Patchnames:
RHSA-2026:57252 (x86_64)

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 Affected
SUSE Linux Enterprise Micro 5.3 kernel-rt Affected
SUSE Linux Enterprise Micro 5.3 kernel-source Affected
SUSE Linux Enterprise Micro 5.3 kernel-source-rt Affected
SUSE Linux Enterprise Micro 5.4 kernel-default Affected
SUSE Linux Enterprise Micro 5.4 kernel-rt Affected
SUSE Linux Enterprise Micro 5.4 kernel-source Affected
SUSE Linux Enterprise Micro 5.4 kernel-source-rt Affected
SUSE Linux Enterprise Micro 5.5 kernel-default Affected
SUSE Linux Enterprise Micro 5.5 kernel-source Affected
SUSE Linux Enterprise Micro 5.5 kernel-source-rt 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 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 Affected
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 Affected
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 Affected
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 Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-default Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-source Affected
SUSE Linux Enterprise Live Patching 12 SP5 kernel-default Affected
SUSE Linux Enterprise Live Patching 12 SP5 kernel-source Affected
SUSE Linux Enterprise Live Patching 15 SP4 kernel-default Affected
SUSE Linux Enterprise Live Patching 15 SP4 kernel-source Affected
SUSE Linux Enterprise Live Patching 15 SP5 kernel-default Affected
SUSE Linux Enterprise Live Patching 15 SP5 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP6 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP4 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-source 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 Affected
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default Affected
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP4 kernel-source Affected
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP5 kernel-source Affected
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-source 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 Affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source 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 Affected
SUSE Enterprise Storage 7.1 kernel-source 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 Affected
SUSE Linux Enterprise Desktop 15 SP3 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP4 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP5 kernel-source 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 Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP4 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-source Affected
SUSE Linux Enterprise Micro 5.0 kernel-default Not affected
SUSE Linux Enterprise Micro 5.1 kernel-default Affected
SUSE Linux Enterprise Micro 5.2 kernel-default Affected
SUSE Linux Enterprise Micro 5.2 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 kernel-source 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 Affected
SUSE Linux Enterprise Module for Development Tools 15 SP3 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP2 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP3 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source-rt Affected
SUSE Linux Enterprise Real Time 15 SP5 kernel-source-rt 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 Affected
SUSE Linux Enterprise Server 15 SP2-BCL kernel-source Affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP3 kernel-source Affected
SUSE Linux Enterprise Server 15 SP3-BCL kernel-source Affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source 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 Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-source Affected
SUSE Manager Proxy 4.0 kernel-source Not affected
SUSE Manager Proxy 4.1 kernel-source Affected
SUSE Manager Proxy 4.2 kernel-source Affected
SUSE Manager Proxy 4.3 kernel-source Affected
SUSE Manager Proxy LTS 4.3 kernel-source Affected
SUSE Manager Retail Branch Server 4.0 kernel-source Not affected
SUSE Manager Retail Branch Server 4.1 kernel-source Affected
SUSE Manager Retail Branch Server 4.2 kernel-source Affected
SUSE Manager Retail Branch Server 4.3 kernel-source Affected
SUSE Manager Retail Branch Server LTS 4.3 kernel-source Affected
SUSE Manager Server 4.0 kernel-source Not affected
SUSE Manager Server 4.1 kernel-source Affected
SUSE Manager Server 4.2 kernel-source Affected
SUSE Manager Server 4.3 kernel-source Affected
SUSE Manager Server LTS 4.3 kernel-source Affected
SUSE Real Time Module 15 SP4 kernel-source-rt Affected
SUSE Real Time Module 15 SP5 kernel-source-rt Affected
openSUSE Leap 15.3 kernel-source Affected
openSUSE Leap 15.4 kernel-source Affected
openSUSE Leap 15.4 kernel-source-rt Affected
openSUSE Leap 15.5 kernel-source Affected
openSUSE Leap 15.5 kernel-source-rt Affected
openSUSE Leap 15.6 kernel-source Affected

SUSE Timeline for this CVE

CVE page created: Thu Aug 13 13:52:15 2026
CVE page last modified: Tue Sep 1 12:03:57 2026