Improper locking in Linux kernel - CVE-2025-38040

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU111601

Improper locking in Linux kernel - CVE-2025-38040

Published: June 20, 2025


Vulnerability identifier: #VU111601
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-2025-38040
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 stm32_usart_enable_ms() function in drivers/tty/serial/stm32-usart.c, within the sci_shutdown() function in drivers/tty/serial/sh-sci.c, within the mctrl_gpio_enable_ms() and mctrl_gpio_disable_ms() functions in drivers/tty/serial/serial_mctrl_gpio.c, within the imx_uart_shutdown() function in drivers/tty/serial/imx.c, within the atmel_disable_ms() function in drivers/tty/serial/atmel_serial.c, within the serial8250_disable_ms() function in drivers/tty/serial/8250/8250_port.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Live Patching
Confidential Computing Module
Development Tools Module
Basesystem Module
Legacy Module
openSUSE Leap
Ubuntu
Anolis OS
openEuler
kgraft-patch-4_12_14-122_269-default
kernel-livepatch-6_4_0-150600_23_60-default-debuginfo
kernel-livepatch-6_4_0-150600_23_60-default
kernel-livepatch-SLE15-SP6_Update_13-debugsource
cluster-md-kmp-default
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-devel-debuginfo
kernel-default-man
kernel-devel
kernel-source
kernel-macros
kernel-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-base
gfs2-kmp-default
kernel-default-devel
kernel-default-debuginfo
kernel-default-debugsource
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
dlm-kmp-default
kernel-default-base-debuginfo
kernel-syms
linux (Debian package)
kernel-coco_debug-devel
kernel-source-coco
kernel-devel-coco
kernel-coco_debug-debugsource
kernel-syms-coco
kernel-coco-vdso-debuginfo
reiserfs-kmp-coco
kernel-coco-debugsource
reiserfs-kmp-coco-debuginfo
kernel-coco_debug-devel-debuginfo
kernel-coco_debug-debuginfo
kernel-coco-devel
kernel-coco_debug
kernel-coco
kernel-coco-debuginfo
kernel-obs-qa
dtb-sprd
dtb-lg
dtb-marvell
dtb-freescale
dtb-altera
dtb-exynos
dtb-broadcom
dtb-apm
dtb-nvidia
dtb-amazon
dtb-socionext
dtb-amlogic
dtb-cavium
dtb-rockchip
dtb-xilinx
dtb-hisilicon
dtb-qcom
dtb-allwinner
dtb-arm
kernel-docs-html
kernel-docs
kernel-obs-build
kernel-obs-build-debugsource
dtb-renesas
dtb-mediatek
dtb-aarch64
dtb-amd
dtb-apple
reiserfs-kmp-64kb
kernel-64kb-extra-debuginfo
dlm-kmp-64kb-debuginfo
kernel-64kb-debuginfo
gfs2-kmp-64kb-debuginfo
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-64kb-optional
kernel-64kb
ocfs2-kmp-64kb
gfs2-kmp-64kb
kernel-debug-debugsource
ocfs2-kmp-64kb-debuginfo
kernel-kvmsmall-devel
kernel-kvmsmall-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-debug-vdso
kernel-debug-debuginfo
kernel-debug-devel
kernel-debug-devel-debuginfo
kernel-debug
kernel-source-vanilla
kernel-zfcpdump-debugsource
kselftests-kmp-64kb
kernel-64kb-optional-debuginfo
reiserfs-kmp-64kb-debuginfo
kernel-64kb-extra
cluster-md-kmp-64kb-debuginfo
cluster-md-kmp-64kb
kselftests-kmp-64kb-debuginfo
kernel-64kb-debugsource
dlm-kmp-64kb
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-kvmsmall
kernel-default-livepatch
reiserfs-kmp-default-debuginfo
kselftests-kmp-default
kernel-default-optional-debuginfo
kernel-default-vdso
kernel-default-vdso-debuginfo
kernel-default-extra
kselftests-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default-optional
kernel-default-livepatch-devel
kernel-default-extra-debuginfo
kernel-default-base-rebuild
python3-perf
kernel
bpftool
python3-perf-debuginfo
bpftool-debuginfo
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-headers
kernel-debugsource
kernel-debuginfo
kernel-extra-modules
kernel-tools-libs-devel
kernel-tools-libs
kernel-64k
kernel-64k-debug
kernel-64k-debug-devel
kernel-64k-devel
linux (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-xilinx (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-ibm (Ubuntu package)
linux-nvidia-lowlatency (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-gcp-6.8 (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux-aws-6.14 (Ubuntu package)
linux-oem-6.14 (Ubuntu package)
linux-realtime-6.14 (Ubuntu package)
linux-oracle-6.14 (Ubuntu package)
linux-raspi (Ubuntu package)

How to mitigate CVE-2025-38040

Install update from vendor's repository.

kgraft-patch-4_12_14-122_269-default - update to 1-8.3.1
kernel-livepatch-6_4_0-150600_23_60-default-debuginfo - update to 1-150600.13.6.4
kernel-livepatch-6_4_0-150600_23_60-default - update to 1-150600.13.6.4
kernel-livepatch-SLE15-SP6_Update_13-debugsource - update to 1-150600.13.6.4
cluster-md-kmp-default - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
kernel-default-kgraft-devel - update to 4.12.14-122.269.1
kernel-default-kgraft - update to 4.12.14-122.269.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
kernel-default-man - update to 4.12.14-122.269.1
kernel-devel - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.4
kernel-source - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.4
kernel-macros - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.4
kernel-default - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
kernel-default-base - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5.150600.12.26.4
gfs2-kmp-default - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
kernel-default-devel - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
kernel-default-debuginfo - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
kernel-default-debugsource - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
ocfs2-kmp-default - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
dlm-kmp-default - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.5
kernel-default-base-debuginfo - update to 4.12.14-122.269.1
kernel-syms - addressed in versions 4.12.14-122.269.1, 6.4.0-150600.23.60.4
linux (Debian package) - update to 6.1.147-1
kernel-coco_debug-devel - update to 6.4.0-15061.28.coco15sp6.1
kernel-source-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-devel-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco_debug-debugsource - update to 6.4.0-15061.28.coco15sp6.1
kernel-syms-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco-vdso-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
reiserfs-kmp-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco-debugsource - update to 6.4.0-15061.28.coco15sp6.1
reiserfs-kmp-coco-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco_debug-devel-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco_debug-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco-devel - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco_debug - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco - update to 6.4.0-15061.28.coco15sp6.1
kernel-coco-debuginfo - update to 6.4.0-15061.28.coco15sp6.1
kernel-obs-qa - update to 6.4.0-150600.23.60.2
dtb-sprd - update to 6.4.0-150600.23.60.3
dtb-lg - update to 6.4.0-150600.23.60.3
dtb-marvell - update to 6.4.0-150600.23.60.3
dtb-freescale - update to 6.4.0-150600.23.60.3
dtb-altera - update to 6.4.0-150600.23.60.3
dtb-exynos - update to 6.4.0-150600.23.60.3
dtb-broadcom - update to 6.4.0-150600.23.60.3
dtb-apm - update to 6.4.0-150600.23.60.3
dtb-nvidia - update to 6.4.0-150600.23.60.3
dtb-amazon - update to 6.4.0-150600.23.60.3
dtb-socionext - update to 6.4.0-150600.23.60.3
dtb-amlogic - update to 6.4.0-150600.23.60.3
dtb-cavium - update to 6.4.0-150600.23.60.3
dtb-rockchip - update to 6.4.0-150600.23.60.3
dtb-xilinx - update to 6.4.0-150600.23.60.3
dtb-hisilicon - update to 6.4.0-150600.23.60.3
dtb-qcom - update to 6.4.0-150600.23.60.3
dtb-allwinner - update to 6.4.0-150600.23.60.3
dtb-arm - update to 6.4.0-150600.23.60.3
kernel-docs-html - update to 6.4.0-150600.23.60.3
kernel-docs - update to 6.4.0-150600.23.60.3
kernel-obs-build - update to 6.4.0-150600.23.60.3
kernel-obs-build-debugsource - update to 6.4.0-150600.23.60.3
dtb-renesas - update to 6.4.0-150600.23.60.3
dtb-mediatek - update to 6.4.0-150600.23.60.3
dtb-aarch64 - update to 6.4.0-150600.23.60.3
dtb-amd - update to 6.4.0-150600.23.60.3
dtb-apple - update to 6.4.0-150600.23.60.3
reiserfs-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.60.4
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-debuginfo - update to 6.4.0-150600.23.60.4
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-devel - update to 6.4.0-150600.23.60.4
kernel-64kb-devel-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-optional - update to 6.4.0-150600.23.60.4
kernel-64kb - update to 6.4.0-150600.23.60.4
ocfs2-kmp-64kb - update to 6.4.0-150600.23.60.4
gfs2-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-debug-debugsource - update to 6.4.0-150600.23.60.4
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-devel - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.60.4
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.60.4
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.60.4
kernel-debug-vdso - update to 6.4.0-150600.23.60.4
kernel-debug-debuginfo - update to 6.4.0-150600.23.60.4
kernel-debug-devel - update to 6.4.0-150600.23.60.4
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.60.4
kernel-debug - update to 6.4.0-150600.23.60.4
kernel-source-vanilla - update to 6.4.0-150600.23.60.4
kernel-zfcpdump-debugsource - update to 6.4.0-150600.23.60.4
kselftests-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.60.4
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-extra - update to 6.4.0-150600.23.60.4
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
cluster-md-kmp-64kb - update to 6.4.0-150600.23.60.4
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.60.4
kernel-64kb-debugsource - update to 6.4.0-150600.23.60.4
dlm-kmp-64kb - update to 6.4.0-150600.23.60.4
kernel-zfcpdump-debuginfo - update to 6.4.0-150600.23.60.4
kernel-zfcpdump - update to 6.4.0-150600.23.60.4
kernel-kvmsmall - update to 6.4.0-150600.23.60.4
kernel-default-livepatch - update to 6.4.0-150600.23.60.5
reiserfs-kmp-default-debuginfo - update to 6.4.0-150600.23.60.5
kselftests-kmp-default - update to 6.4.0-150600.23.60.5
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.60.5
kernel-default-vdso - update to 6.4.0-150600.23.60.5
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.60.5
kernel-default-extra - update to 6.4.0-150600.23.60.5
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.60.5
reiserfs-kmp-default - update to 6.4.0-150600.23.60.5
kernel-default-optional - update to 6.4.0-150600.23.60.5
kernel-default-livepatch-devel - update to 6.4.0-150600.23.60.5
kernel-default-extra-debuginfo - update to 6.4.0-150600.23.60.5
kernel-default-base-rebuild - update to 6.4.0-150600.23.60.5.150600.12.26.4
python3-perf - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
bpftool - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
python3-perf-debuginfo - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
bpftool-debuginfo - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
perf-debuginfo - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
perf - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-tools-devel - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-tools-debuginfo - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-tools - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-source - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-headers - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-devel - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-debugsource - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-debuginfo - addressed in versions 6.6.0-104.0.0.96, 6.6.0-104.0.0.107, 6.6.0-104.0.0.110
kernel-extra-modules - update to 6.6.0-104.0.0.110
perf - update to 6.6.102-5
kernel-tools-libs-devel - update to 6.6.102-5
bpftool - update to 6.6.102-5
kernel - update to 6.6.102-5
kernel-debug - update to 6.6.102-5
kernel-debug-devel - update to 6.6.102-5
kernel-devel - update to 6.6.102-5
kernel-headers - update to 6.6.102-5
kernel-tools - update to 6.6.102-5
kernel-tools-libs - update to 6.6.102-5
python3-perf - update to 6.6.102-5
kernel-64k - update to 6.6.102-5
kernel-64k-debug - update to 6.6.102-5
kernel-64k-debug-devel - update to 6.6.102-5
kernel-64k-devel - update to 6.6.102-5
linux (Ubuntu package) - addressed in versions 6.8.0-100.100, 6.8.0-1047.51, 6.14.0-32.32, 6.14.0-32.32.1, 6.14.0-32.32.1~24.04.1, 6.14.0-1012.12~24.04.1, 6.14.0-1013.13, 6.14.0-1016.17, 6.14.0-1016.17~24.04.1
linux-aws-fips (Ubuntu package) - addressed in versions 6.8.0-100.100+fips1, 6.8.0-1046.49+fips1
linux-lowlatency (Ubuntu package) - update to 6.8.0-100.100.1
linux-hwe-6.8 (Ubuntu package) - addressed in versions 6.8.0-100.100.1~22.04.1, 6.8.0-100.100~22.04.1
linux-xilinx (Ubuntu package) - addressed in versions 6.8.0-1023.24, 6.8.0.1023.24
linux-aws (Ubuntu package) - addressed in versions 6.8.0-1030.33, 6.8.0-1043.44, 6.8.0-1043.44~22.04.1, 6.8.0-1046.49~22.04.1
linux-gcp (Ubuntu package) - addressed in versions 6.8.0-1043.48, 6.8.0-1047.50~22.04.2
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1044.44, 6.8.0-1044.44~22.04.1
linux-nvidia-lowlatency (Ubuntu package) - update to 6.8.0-1046.49.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1046.52, 6.14.0-1012.12
linux-azure-fips (Ubuntu package) - update to 6.8.0-1046.52+fips1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1047.50+fips1
linux-gcp-6.8 (Ubuntu package) - update to 6.8.0-1047.50~22.04.2
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-raspi-realtime (Ubuntu package) - addressed in versions 6.8.0-2037.38, 6.8.1-1041.42
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1041.42~22.04.1
linux-aws-6.14 (Ubuntu package) - addressed in versions 6.14.0-32.32~24.04.1, 6.14.0-1013.13~24.04.1
linux-oem-6.14 (Ubuntu package) - update to 6.14.0-1012.12
linux-realtime-6.14 (Ubuntu package) - update to 6.14.0-1012.12~24.04.1
linux-oracle-6.14 (Ubuntu package) - update to 6.14.0-1013.13~24.04.1
linux-raspi (Ubuntu package) - update to 6.14.0-1014.14

External References

Related Security Bulletins