Improper locking in Linux kernel - CVE-2025-21878

Vulnerability identifier: #VU106117

CSH Severity: Low

CVSS v4.0: 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/E:U/U:Clear

CVE-ID: CVE-2025-21878

CWE-ID: CWE-667

Exploitation vector: Local access

Exploit availability: No public exploit available

Affected software:
Linux kernel
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Workstation Extension 15
Confidential Computing Module
Public Cloud Module
Development Tools Module
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Basesystem Module
Legacy Module
openSUSE Leap
Ubuntu
openEuler
APEX Cloud Platform for Microsoft Azure
kernel-livepatch-SLE15-SP6-RT_Update_10-debugsource
kernel-livepatch-6_4_0-150600_10_34-rt
kernel-livepatch-6_4_0-150600_10_34-rt-debuginfo
kernel-livepatch-6_4_0-150600_23_47-default
kernel-livepatch-6_4_0-150600_23_47-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_10-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
linux (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-xilinx-zynqmp (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-gke (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-gcp (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux (Debian package)
kernel-coco_debug-debugsource
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-devel-debuginfo
kernel-coco-debuginfo
kernel-coco-vdso-debuginfo
reiserfs-kmp-coco-debuginfo
kernel-devel-coco
kernel-source-coco
kernel-syms-azure
kernel-azure-devel
gfs2-kmp-azure-debuginfo
reiserfs-kmp-azure
kernel-azure-debuginfo
ocfs2-kmp-azure
kselftests-kmp-azure
cluster-md-kmp-azure
ocfs2-kmp-azure-debuginfo
kernel-source-azure
kernel-devel-azure
kernel-azure-vdso
kernel-azure-vdso-debuginfo
kernel-azure
kernel-azure-extra-debuginfo
kernel-azure-optional-debuginfo
kernel-azure-extra
dlm-kmp-azure-debuginfo
kselftests-kmp-azure-debuginfo
gfs2-kmp-azure
kernel-azure-devel-debuginfo
kernel-azure-optional
cluster-md-kmp-azure-debuginfo
reiserfs-kmp-azure-debuginfo
kernel-azure-debugsource
dlm-kmp-azure
kernel-rt-devel-debuginfo
kernel-rt-vdso
kernel-rt-devel
kernel-rt-extra
kernel-rt_debug-vdso
kernel-rt-optional
kernel-rt_debug-debuginfo
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt
kernel-rt_debug
kernel-source-rt
kernel-devel-rt
kernel-rt_debug-devel
ocfs2-kmp-rt
reiserfs-kmp-rt
kernel-rt_debug-debugsource
gfs2-kmp-rt
kernel-rt-debugsource
kselftests-kmp-rt
kernel-syms-rt
kernel-rt-livepatch-devel
kernel-rt_debug-vdso-debuginfo
kernel-rt-debuginfo
kselftests-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
kernel-rt-optional-debuginfo
kernel-rt-extra-debuginfo
dlm-kmp-rt
cluster-md-kmp-rt
kernel-rt_debug-devel-debuginfo
kernel-rt-vdso-debuginfo
gfs2-kmp-rt-debuginfo
reiserfs-kmp-rt-debuginfo
dtb-cavium
kernel-docs
dtb-freescale
dtb-exynos
dtb-lg
dtb-nvidia
dtb-qcom
dtb-socionext
dtb-altera
dtb-broadcom
dtb-arm
kernel-docs-html
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-obs-qa
dtb-aarch64
dtb-mediatek
dtb-xilinx
dtb-allwinner
dtb-renesas
dtb-marvell
dtb-amazon
dtb-amd
dtb-hisilicon
dtb-apm
dtb-apple
dtb-rockchip
dtb-sprd
dtb-amlogic
cluster-md-kmp-64kb
kernel-64kb-devel-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
gfs2-kmp-default
kselftests-kmp-64kb
kernel-64kb-devel
kernel-64kb-extra
kselftests-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
kernel-zfcpdump
kernel-64kb-extra-debuginfo
cluster-md-kmp-64kb-debuginfo
kernel-64kb-debugsource
reiserfs-kmp-64kb-debuginfo
dlm-kmp-64kb-debuginfo
kernel-64kb-optional
dlm-kmp-64kb
reiserfs-kmp-default-debuginfo
kernel-default-optional-debuginfo
kernel-default-devel
kernel-default-extra
dlm-kmp-default
kernel-default-livepatch
kernel-default-optional
kernel-default-debuginfo
cluster-md-kmp-default
dlm-kmp-default-debuginfo
kselftests-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-devel-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
kernel-default
kernel-default-livepatch-devel
kernel-kvmsmall
kernel-debug-debuginfo
kernel-kvmsmall-devel
kernel-kvmsmall-vdso-debuginfo
kernel-default-vdso-debuginfo
kernel-debug-vdso-debuginfo
kernel-debug-vdso
kernel-default-vdso
kernel-kvmsmall-vdso
kernel-debug-devel
kernel-default-extra-debuginfo
kernel-debug-debugsource
kernel-debug-devel-debuginfo
kernel-debug
kernel-source
kernel-devel
kernel-source-vanilla
kernel-macros
kernel-kvmsmall-debuginfo
gfs2-kmp-64kb-debuginfo
ocfs2-kmp-64kb-debuginfo
ocfs2-kmp-64kb
kselftests-kmp-default
reiserfs-kmp-default
reiserfs-kmp-64kb
kernel-64kb-debuginfo
gfs2-kmp-64kb
kernel-64kb
gfs2-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-default-base
kernel-default-base-rebuild
kernel-tools-debuginfo
kernel
kernel-headers
kernel-tools
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
linux-hwe-6.8 (Ubuntu package)
linux-azure-nvidia (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux-lowlatency (Ubuntu package)

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

The vulnerability exists due to improper locking within the npcm_i2c_probe_bus() function in drivers/i2c/busses/i2c-npcm7xx.c. A local user can perform a denial of service (DoS) attack.

Install update from vendor's website.

• https://git.kernel.org/stable/c/12d0e39916705b68d2d8ba20a8e35d1d27afc260
• https://git.kernel.org/stable/c/1b267e1b87d52b16e7dfcc7ab2ab760f6f8f9ca9
• https://git.kernel.org/stable/c/545b563eb00d0576775da4011b3f7ffefc9e8c60
• https://git.kernel.org/stable/c/846e371631c57365eeb89e5db1ab0f344169af93
• https://git.kernel.org/stable/c/dd1998e243f5fa25d348a384ba0b6c84d980f2b2
• https://git.kernel.org/stable/c/e3aea1dba97d31eceed7b622000af0406988b9c8
• https://git.kernel.org/stable/c/f32d7b4dc6e791523c70e83049645dcba2a2aa33
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.235