Improper locking in Linux kernel - CVE-2025-21912

Vulnerability identifier: #VU106792

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-2025-21912

CWE-ID: CWE-667

Exploitation vector: Local access

Exploit availability: No public exploit available

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 Workstation Extension 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Real Time Module
SUSE Linux Enterprise Live Patching
Confidential Computing Module
Public Cloud Module
Legacy Module
Basesystem Module
Development Tools Module
openSUSE Leap
Ubuntu
openEuler
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-6_4_0-150700_53_3-default
kernel-livepatch-6_4_0-150700_53_3-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_1-debugsource
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-debuginfo
kernel-coco_debug
kernel-source-coco
kernel-devel-coco
reiserfs-kmp-coco-debuginfo
kernel-coco-vdso-debuginfo
kernel-coco-debuginfo
kernel-coco_debug-devel-debuginfo
kernel-coco_debug-debugsource
reiserfs-kmp-coco
kernel-coco-debugsource
kernel-coco_debug-devel
kernel-coco-devel
kernel-syms-coco
kernel-coco
cluster-md-kmp-azure
dlm-kmp-azure
ocfs2-kmp-azure-debuginfo
gfs2-kmp-azure
kernel-syms-azure
reiserfs-kmp-azure
kselftests-kmp-azure
kernel-azure-devel-debuginfo
kselftests-kmp-azure-debuginfo
gfs2-kmp-azure-debuginfo
kernel-azure-extra-debuginfo
kernel-devel-azure
kernel-azure-extra
reiserfs-kmp-azure-debuginfo
kernel-azure-optional
kernel-azure-debugsource
kernel-azure-devel
cluster-md-kmp-azure-debuginfo
kernel-azure-optional-debuginfo
ocfs2-kmp-azure
kernel-azure-vdso-debuginfo
kernel-source-azure
kernel-azure-vdso
kernel-azure
dlm-kmp-azure-debuginfo
kernel-azure-debuginfo
kernel-rt-optional-debuginfo
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
reiserfs-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
reiserfs-kmp-rt
gfs2-kmp-rt
kernel-rt_debug-vdso-debuginfo
kernel-rt-livepatch-devel
kselftests-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-devel
kernel-syms-rt
kernel-rt_debug-debuginfo
kernel-rt_debug-vdso
kernel-rt_debug-devel-debuginfo
kernel-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug
kernel-rt
kernel-source-rt
kernel-devel-rt
kernel-rt_debug-debugsource
dlm-kmp-rt
kernel-rt-optional
kernel-default
kernel-source
kernel-obs-build
kernel-syms
kernel-obs-build-debugsource
kernel-docs
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-macros
kernel-zfcpdump
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-debugsource
kernel-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
cluster-md-kmp-default
ocfs2-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-extra-debuginfo
kernel-default-extra
kernel-devel
kernel-default-devel
kernel-default-devel-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-default-base
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-tools-debuginfo
kernel-headers
kernel-tools
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
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)
linux-oem-6.11 (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 gpio_rcar_config_interrupt_input_mode(), gpio_rcar_config_general_input_output_mode(), gpio_rcar_get_multiple(), gpio_rcar_set(), gpio_rcar_set_multiple() and gpio_rcar_probe() functions in drivers/gpio/gpio-rcar.c. A local user can perform a denial of service (DoS) attack.

Install update from vendor's website.

• https://git.kernel.org/stable/c/3e300913c42041e81c5b17a970c4e078086ff2d1
• https://git.kernel.org/stable/c/51ef3073493e2a25dced05fdd59dfb059e7e284d
• https://git.kernel.org/stable/c/7c1f36f9c9aca507d317479a3d3388150ae40a87
• https://git.kernel.org/stable/c/b42c84f9e4ec5bc2885e7fd80c79ec0352f5d2af
• https://git.kernel.org/stable/c/c10365031f16514a29c812cd909085a6e4ea4b61
• https://git.kernel.org/stable/c/f02c41f87cfe61440c18bf77d1ef0a884b9ee2b5
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.179
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.131
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.19
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.7
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.83