Improper locking in Linux kernel - CVE-2025-21943

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Main Vulnerability Database Vulnerabilities #VU106768

Improper locking in Linux kernel - CVE-2025-21943

Published: April 2, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU106768
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-21943
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the new_device_store(), kfree() and delete_device_store() functions in drivers/gpio/gpio-aggregator.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Confidential Computing Module
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
openSUSE Leap
Ubuntu
openEuler
linux-azure (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
kernel-livepatch-6_4_0-150600_10_39-rt
kernel-livepatch-6_4_0-150600_10_39-rt-debuginfo
kernel-livepatch-SLE15-SP6-RT_Update_11-debugsource
kernel-livepatch-SLE15-SP7_Update_1-debugsource
kernel-livepatch-6_4_0-150700_53_3-default-debuginfo
kernel-livepatch-6_4_0-150700_53_3-default
perf-debuginfo
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
kernel
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
python3-perf
python3-perf-debuginfo
bpftool
bpftool-debuginfo
kernel-coco_debug
kernel-coco
kernel-coco_debug-debuginfo
kernel-syms-coco
kernel-coco-devel
kernel-coco_debug-devel
kernel-coco-debugsource
reiserfs-kmp-coco
kernel-coco_debug-debugsource
kernel-coco_debug-devel-debuginfo
kernel-coco-debuginfo
kernel-coco-vdso-debuginfo
reiserfs-kmp-coco-debuginfo
kernel-devel-coco
kernel-source-coco
kernel-syms-azure
kernel-azure-extra
dlm-kmp-azure
kernel-azure-extra-debuginfo
gfs2-kmp-azure-debuginfo
kselftests-kmp-azure-debuginfo
kernel-azure-devel-debuginfo
kselftests-kmp-azure
reiserfs-kmp-azure
reiserfs-kmp-azure-debuginfo
gfs2-kmp-azure
ocfs2-kmp-azure-debuginfo
kernel-azure-debuginfo
dlm-kmp-azure-debuginfo
kernel-azure
kernel-azure-vdso-debuginfo
kernel-azure-vdso
kernel-azure-optional
kernel-source-azure
kernel-devel-azure
cluster-md-kmp-azure
ocfs2-kmp-azure
kernel-azure-optional-debuginfo
cluster-md-kmp-azure-debuginfo
kernel-azure-devel
kernel-azure-debugsource
kernel-rt_debug-debuginfo
dlm-kmp-rt
kernel-rt-optional
ocfs2-kmp-rt
kernel-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-vdso
kernel-rt-optional-debuginfo
kernel-rt_debug-debugsource
kselftests-kmp-rt
kernel-rt_debug-devel
kernel-rt-vdso
kernel-rt-extra
kernel-rt-debugsource
cluster-md-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt-vdso-debuginfo
kernel-rt-extra-debuginfo
cluster-md-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kselftests-kmp-rt-debuginfo
kernel-rt-livepatch-devel
kernel-rt_debug-vdso-debuginfo
gfs2-kmp-rt
reiserfs-kmp-rt
kernel-rt-devel-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt_debug
kernel-rt
kernel-source-rt
kernel-devel-rt
kernel-rt-devel
kernel-syms-rt
kernel-default-debuginfo
kernel-64kb-devel
kernel-64kb
ocfs2-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
dlm-kmp-default
kernel-default-livepatch-devel
kernel-default-livepatch
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default
cluster-md-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
kernel-default-devel-debuginfo
kernel-default-debugsource
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default
kernel-zfcpdump-debuginfo
kernel-default-extra-debuginfo
kernel-default-extra
kernel-obs-build
kernel-syms
kernel-obs-build-debugsource
kernel-docs
kernel-zfcpdump-debugsource
kernel-64kb-debugsource
kernel-zfcpdump
kernel-macros
kernel-default-devel
kernel-64kb-devel-debuginfo
kernel-64kb-debuginfo
kernel-default-base
linux (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-aws (Ubuntu package)
linux-xilinx-zynqmp (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-gke (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-gcp (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux (Debian package)
linux-hwe-6.8 (Ubuntu package)
linux-azure-nvidia (Ubuntu package)
linux-oracle (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-oem-6.11 (Ubuntu package)

How to mitigate CVE-2025-21943

Install update from vendor's website.

Linux kernel - update to 5.10.235
linux-azure (Ubuntu package) - addressed in versions 5.15.0-1037.37, 5.15.0-1089.98~20.04.1, 5.15.0-1089.98, 5.15.0.1037.37, 5.15.0.1089.87, 5.15.0.1089.98~20.04.1, 6.8.0-1030.35, 6.11.0-1018.18~24.04.1, 6.11.0-1018.18
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1030.35~22.04.1
kernel-livepatch-6_4_0-150600_10_39-rt - update to 1-150600.1.3.2
kernel-livepatch-6_4_0-150600_10_39-rt-debuginfo - update to 1-150600.1.3.2
kernel-livepatch-SLE15-SP6-RT_Update_11-debugsource - update to 1-150600.1.3.2
kernel-livepatch-SLE15-SP7_Update_1-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_3-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_3-default - update to 1-150700.15.3.1
perf-debuginfo - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-source - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-headers - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-devel - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-debugsource - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-debuginfo - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-tools - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-tools-debuginfo - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-tools-devel - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
perf - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
python3-perf - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
python3-perf-debuginfo - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
bpftool - addressed in versions 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
bpftool-debuginfo - addressed in versions 5.10.0-259.0.0.162, 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-coco_debug - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-syms-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-devel - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-devel - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-debugsource - update to 6.4.0-15061.21.coco15sp6.1
reiserfs-kmp-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-debugsource - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-devel-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-vdso-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
reiserfs-kmp-coco-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-devel-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-source-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-syms-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-azure-extra - update to 6.4.0-150600.8.37.1
dlm-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-azure-extra-debuginfo - update to 6.4.0-150600.8.37.1
gfs2-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kselftests-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-devel-debuginfo - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kselftests-kmp-azure - update to 6.4.0-150600.8.37.1
reiserfs-kmp-azure - update to 6.4.0-150600.8.37.1
reiserfs-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
gfs2-kmp-azure - update to 6.4.0-150600.8.37.1
ocfs2-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-debuginfo - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
dlm-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-azure-vdso-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-vdso - update to 6.4.0-150600.8.37.1
kernel-azure-optional - update to 6.4.0-150600.8.37.1
kernel-source-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-devel-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
cluster-md-kmp-azure - update to 6.4.0-150600.8.37.1
ocfs2-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-azure-optional-debuginfo - update to 6.4.0-150600.8.37.1
cluster-md-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-devel - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-azure-debugsource - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-rt_debug-debuginfo - update to 6.4.0-150600.10.39.1
dlm-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt-optional - update to 6.4.0-150600.10.39.1
ocfs2-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt_debug-devel-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt_debug-vdso - update to 6.4.0-150600.10.39.1
kernel-rt-optional-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt_debug-debugsource - update to 6.4.0-150600.10.39.1
kselftests-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt_debug-devel - update to 6.4.0-150600.10.39.1
kernel-rt-vdso - update to 6.4.0-150600.10.39.1
kernel-rt-extra - update to 6.4.0-150600.10.39.1
kernel-rt-debugsource - update to 6.4.0-150600.10.39.1
cluster-md-kmp-rt - update to 6.4.0-150600.10.39.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-vdso-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-extra-debuginfo - update to 6.4.0-150600.10.39.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kselftests-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-livepatch-devel - update to 6.4.0-150600.10.39.1
kernel-rt_debug-vdso-debuginfo - update to 6.4.0-150600.10.39.1
gfs2-kmp-rt - update to 6.4.0-150600.10.39.1
reiserfs-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt-devel-debuginfo - update to 6.4.0-150600.10.39.1
reiserfs-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt_debug - update to 6.4.0-150600.10.39.1
kernel-rt - update to 6.4.0-150600.10.39.1
kernel-source-rt - update to 6.4.0-150600.10.39.1
kernel-devel-rt - update to 6.4.0-150600.10.39.1
kernel-rt-devel - update to 6.4.0-150600.10.39.1
kernel-syms-rt - update to 6.4.0-150600.10.39.1
kernel-default-debuginfo - update to 6.4.0-150700.53.3.1
kernel-64kb-devel - update to 6.4.0-150700.53.3.1
kernel-64kb - update to 6.4.0-150700.53.3.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
dlm-kmp-default - update to 6.4.0-150700.53.3.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.3.1
kernel-default-livepatch - update to 6.4.0-150700.53.3.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
ocfs2-kmp-default - update to 6.4.0-150700.53.3.1
cluster-md-kmp-default - update to 6.4.0-150700.53.3.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
gfs2-kmp-default - update to 6.4.0-150700.53.3.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-debugsource - update to 6.4.0-150700.53.3.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
reiserfs-kmp-default - update to 6.4.0-150700.53.3.1
kernel-default - update to 6.4.0-150700.53.3.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-extra - update to 6.4.0-150700.53.3.1
kernel-source - update to 6.4.0-150700.53.3.1
kernel-obs-build - update to 6.4.0-150700.53.3.1
kernel-syms - update to 6.4.0-150700.53.3.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.3.1
kernel-docs - update to 6.4.0-150700.53.3.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.3.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.3.1
kernel-zfcpdump - update to 6.4.0-150700.53.3.1
kernel-macros - update to 6.4.0-150700.53.3.1
kernel-devel - update to 6.4.0-150700.53.3.1
kernel-default-devel - update to 6.4.0-150700.53.3.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.3.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-base - update to 6.4.0-150700.53.3.1.150700.17.2.1
linux (Ubuntu package) - addressed in versions 5.15.0-140.150~20.04.1, 5.15.0-140.150, 5.15.0-1066.74, 5.15.0-1076.79~20.04.1, 5.15.0-1076.79, 5.15.0-1078.79, 5.15.0-1079.85, 5.15.0-1080.85, 5.15.0-1081.87~20.04.1, 5.15.0-1081.87, 5.15.0.140.126, 5.15.0.140.135, 5.15.0.140.150~20.04.1, 5.15.0.1066.65, 5.15.0.1076.72, 5.15.0.1076.79~20.04.1, 5.15.0.1078.78, 5.15.0.1079.79, 5.15.0.1080.76, 5.15.0.1081.77, 5.15.0.1081.87~20.04.1, 6.8.0-62.65, 6.8.0-62.65.1~22.04.1, 6.8.0-62.65.1, 6.8.0-1013.15, 6.8.0-1026.30, 6.8.0-1027.27, 6.8.0-1029.29, 6.8.0-1029.32~22.04.1, 6.8.0-1029.32, 6.8.0-1029.32.1, 6.8.0-1030.32~22.04.1, 6.8.0-1030.32~22.04.1+1, 6.8.0-1030.32, 6.8.0-1030.32+1, 6.11.0-28.28~24.04.1, 6.11.0-28.28, 6.11.0-1011.11, 6.11.0-1014.14, 6.11.0-1015.16, 6.11.0-1016.16~24.04.1, 6.11.0-1016.16, 6.11.0-1017.18
linux-hwe-5.15 (Ubuntu package) - addressed in versions 5.15.0-142.152~20.04.1, 5.15.0.142.152~20.04.1
linux-aws (Ubuntu package) - addressed in versions 5.15.0-1026.26, 5.15.0-1078.81, 5.15.0-1079.85~20.04.1, 5.15.0-1084.91, 5.15.0.1026.28, 5.15.0.1078.76, 5.15.0.1079.85~20.04.1, 5.15.0.1084.86
linux-xilinx-zynqmp (Ubuntu package) - addressed in versions 5.15.0-1050.54, 5.15.0.1050.53
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1077.79, 5.15.0-1084.93, 5.15.0.1077.81, 5.15.0.1084.88
linux-gke (Ubuntu package) - addressed in versions 5.15.0-1081.87, 5.15.0.1081.80
linux-gcp-5.15 (Ubuntu package) - addressed in versions 5.15.0-1083.92~20.04.1, 5.15.0.1083.92~20.04.1
linux-gcp (Ubuntu package) - addressed in versions 5.15.0-1083.92, 5.15.0.1083.79, 6.8.0-1031.33~22.04.1, 6.8.0-1031.33
linux-gcp-fips (Ubuntu package) - addressed in versions 5.15.0-1083.92+fips1, 5.15.0.1083.73
linux-aws-5.15 (Ubuntu package) - addressed in versions 5.15.0-1084.91~20.04.1, 5.15.0.1084.91~20.04.1
linux-aws-fips (Ubuntu package) - addressed in versions 5.15.0-1084.91+fips1, 5.15.0.1084.80
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0-1089.98+fips1, 5.15.0.1089.74
linux (Debian package) - update to 6.1.133-1
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-64.67~22.04.1
linux-azure-nvidia (Ubuntu package) - update to 6.8.0-1018.19
linux-oracle (Ubuntu package) - addressed in versions 6.8.0-1027.28~22.04.1, 6.8.0-1027.28, 6.8.0-1029.33
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2024.25
linux-realtime (Ubuntu package) - update to 6.8.1-1023.24
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1015.16~24.04.2, 6.11.0-1015.16
linux-oem-6.11 (Ubuntu package) - update to 6.11.0-1024.24

External References

Related Security Bulletins