Improper locking in Linux kernel - CVE-2025-21825

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Main Vulnerability Database Vulnerabilities #VU105415

Improper locking in Linux kernel - CVE-2025-21825

Published: March 6, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU105415
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-2025-21825
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 bpf_timer_cancel_and_free() function in kernel/bpf/helpers.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Live Patching
Public Cloud Module
Confidential Computing Module
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
openSUSE Leap
Ubuntu
SmartFabric Manager
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-debuginfo
kernel-livepatch-SLE15-SP6_Update_10-debugsource
kernel-livepatch-6_4_0-150600_23_47-default
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_debug-debuginfo
kernel-coco
kernel-syms-azure
kernel-azure-devel
gfs2-kmp-azure-debuginfo
gfs2-kmp-azure
kernel-source-azure
kernel-devel-azure
kernel-azure-vdso
kernel-azure-vdso-debuginfo
kernel-azure
dlm-kmp-azure
kernel-azure-debugsource
reiserfs-kmp-azure-debuginfo
cluster-md-kmp-azure-debuginfo
kernel-azure-optional
kernel-azure-devel-debuginfo
dlm-kmp-azure-debuginfo
kernel-azure-extra-debuginfo
cluster-md-kmp-azure
ocfs2-kmp-azure
reiserfs-kmp-azure
kernel-azure-debuginfo
kselftests-kmp-azure
ocfs2-kmp-azure-debuginfo
kernel-azure-optional-debuginfo
kernel-azure-extra
kselftests-kmp-azure-debuginfo
kernel-rt-devel
kernel-rt-devel-debuginfo
kernel-rt
kernel-rt_debug
kernel-source-rt
kernel-devel-rt
ocfs2-kmp-rt
kernel-rt_debug-vdso
kernel-rt_debug-devel
kernel-rt-extra
kernel-rt-vdso
kernel-rt-optional
kernel-rt_debug-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-rt-extra-debuginfo
cluster-md-kmp-rt-debuginfo
cluster-md-kmp-rt
gfs2-kmp-rt-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt-vdso-debuginfo
kernel-rt_debug-devel-debuginfo
dlm-kmp-rt
kselftests-kmp-rt
kernel-rt_debug-debugsource
gfs2-kmp-rt
reiserfs-kmp-rt
kernel-rt-debugsource
kernel-syms-rt
kernel-rt-livepatch-devel
kernel-rt_debug-vdso-debuginfo
kernel-rt-optional-debuginfo
kernel-rt-debuginfo
kselftests-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
dtb-rockchip
dtb-sprd
dtb-apple
kernel-obs-build-debugsource
dtb-freescale
kernel-obs-qa
dtb-apm
dtb-hisilicon
dtb-amd
dtb-amazon
dtb-marvell
dtb-aarch64
dtb-mediatek
dtb-xilinx
dtb-allwinner
dtb-renesas
kernel-docs
dtb-altera
kernel-obs-build
kernel-docs-html
dtb-socionext
dtb-arm
dtb-broadcom
dtb-amlogic
dtb-cavium
dtb-exynos
dtb-lg
kernel-syms
dtb-nvidia
dtb-qcom
dlm-kmp-64kb-debuginfo
kernel-default-debugsource
reiserfs-kmp-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb
cluster-md-kmp-64kb-debuginfo
kernel-64kb-extra-debuginfo
gfs2-kmp-64kb
kernel-64kb-optional
reiserfs-kmp-64kb
dlm-kmp-64kb
cluster-md-kmp-64kb
kernel-64kb-debuginfo
gfs2-kmp-64kb-debuginfo
ocfs2-kmp-64kb-debuginfo
ocfs2-kmp-64kb
kernel-source
kselftests-kmp-default-debuginfo
kernel-default-extra-debuginfo
kselftests-kmp-default
reiserfs-kmp-default
cluster-md-kmp-default-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-64kb-devel-debuginfo
kernel-macros
kernel-source-vanilla
kernel-devel
gfs2-kmp-default-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-debug-debuginfo
kernel-debug-debugsource
kernel-debug-devel-debuginfo
kernel-debug
kernel-zfcpdump
reiserfs-kmp-default-debuginfo
kernel-default-debuginfo
ocfs2-kmp-default
kernel-default-devel-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default
kernel-default-livepatch-devel
kernel-kvmsmall
kernel-default-optional
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kselftests-kmp-64kb
kernel-64kb-devel
kernel-64kb-extra
kselftests-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
dlm-kmp-default
gfs2-kmp-default
kernel-default-optional-debuginfo
dlm-kmp-default-debuginfo
cluster-md-kmp-default
kernel-default-devel
kernel-default-extra
kernel-default-livepatch
kernel-default-base
kernel-default-base-rebuild
linux (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi (Ubuntu package)
linux-gcp (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-aws (Ubuntu package)
APEX Cloud Platform for Red Hat OpenShift

How to mitigate CVE-2025-21825

Install update from vendor's website.

Linux kernel - update to 6.13.2
SmartFabric Manager - update to 1.3.0
APEX Cloud Platform for Microsoft Azure - update to 01.05.01.00
kernel-livepatch-SLE15-SP6-RT_Update_10-debugsource - update to 1-150600.1.5.1
kernel-livepatch-6_4_0-150600_10_34-rt - update to 1-150600.1.5.1
kernel-livepatch-6_4_0-150600_10_34-rt-debuginfo - update to 1-150600.1.5.1
kernel-livepatch-6_4_0-150600_23_47-default-debuginfo - update to 1-150600.13.5.1
kernel-livepatch-SLE15-SP6_Update_10-debugsource - update to 1-150600.13.5.1
kernel-livepatch-6_4_0-150600_23_47-default - update to 1-150600.13.5.1
APEX Cloud Platform for Red Hat OpenShift - update to 03.02.04.00
kernel-coco_debug - update to 6.4.0-15061.21.coco15sp6.1
kernel-source-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-devel-coco - update to 6.4.0-15061.21.coco15sp6.1
reiserfs-kmp-coco-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-vdso-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-debuginfo - 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_debug-debugsource - update to 6.4.0-15061.21.coco15sp6.1
reiserfs-kmp-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-debugsource - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-devel - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-devel - update to 6.4.0-15061.21.coco15sp6.1
kernel-syms-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-syms-azure - update to 6.4.0-150600.8.34.1
kernel-azure-devel - update to 6.4.0-150600.8.34.2
gfs2-kmp-azure-debuginfo - update to 6.4.0-150600.8.34.2
gfs2-kmp-azure - update to 6.4.0-150600.8.34.2
kernel-source-azure - update to 6.4.0-150600.8.34.2
kernel-devel-azure - update to 6.4.0-150600.8.34.2
kernel-azure-vdso - update to 6.4.0-150600.8.34.2
kernel-azure-vdso-debuginfo - update to 6.4.0-150600.8.34.2
kernel-azure - update to 6.4.0-150600.8.34.2
dlm-kmp-azure - update to 6.4.0-150600.8.34.2
kernel-azure-debugsource - update to 6.4.0-150600.8.34.2
reiserfs-kmp-azure-debuginfo - update to 6.4.0-150600.8.34.2
cluster-md-kmp-azure-debuginfo - update to 6.4.0-150600.8.34.2
kernel-azure-optional - update to 6.4.0-150600.8.34.2
kernel-azure-devel-debuginfo - update to 6.4.0-150600.8.34.2
dlm-kmp-azure-debuginfo - update to 6.4.0-150600.8.34.2
kernel-azure-extra-debuginfo - update to 6.4.0-150600.8.34.2
cluster-md-kmp-azure - update to 6.4.0-150600.8.34.2
ocfs2-kmp-azure - update to 6.4.0-150600.8.34.2
reiserfs-kmp-azure - update to 6.4.0-150600.8.34.2
kernel-azure-debuginfo - update to 6.4.0-150600.8.34.2
kselftests-kmp-azure - update to 6.4.0-150600.8.34.2
ocfs2-kmp-azure-debuginfo - update to 6.4.0-150600.8.34.2
kernel-azure-optional-debuginfo - update to 6.4.0-150600.8.34.2
kernel-azure-extra - update to 6.4.0-150600.8.34.2
kselftests-kmp-azure-debuginfo - update to 6.4.0-150600.8.34.2
kernel-rt-devel - update to 6.4.0-150600.10.34.1
kernel-rt-devel-debuginfo - update to 6.4.0-150600.10.34.1
kernel-rt - update to 6.4.0-150600.10.34.1
kernel-rt_debug - update to 6.4.0-150600.10.34.1
kernel-source-rt - update to 6.4.0-150600.10.34.1
kernel-devel-rt - update to 6.4.0-150600.10.34.1
ocfs2-kmp-rt - update to 6.4.0-150600.10.34.1
kernel-rt_debug-vdso - update to 6.4.0-150600.10.34.1
kernel-rt_debug-devel - update to 6.4.0-150600.10.34.1
kernel-rt-extra - update to 6.4.0-150600.10.34.1
kernel-rt-vdso - update to 6.4.0-150600.10.34.1
kernel-rt-optional - update to 6.4.0-150600.10.34.1
kernel-rt_debug-debuginfo - update to 6.4.0-150600.10.34.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150600.10.34.1
kernel-rt-extra-debuginfo - update to 6.4.0-150600.10.34.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150600.10.34.1
cluster-md-kmp-rt - update to 6.4.0-150600.10.34.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150600.10.34.1
reiserfs-kmp-rt-debuginfo - update to 6.4.0-150600.10.34.1
kernel-rt-vdso-debuginfo - update to 6.4.0-150600.10.34.1
kernel-rt_debug-devel-debuginfo - update to 6.4.0-150600.10.34.1
dlm-kmp-rt - update to 6.4.0-150600.10.34.1
kselftests-kmp-rt - update to 6.4.0-150600.10.34.1
kernel-rt_debug-debugsource - update to 6.4.0-150600.10.34.1
gfs2-kmp-rt - update to 6.4.0-150600.10.34.1
reiserfs-kmp-rt - update to 6.4.0-150600.10.34.1
kernel-rt-debugsource - update to 6.4.0-150600.10.34.1
kernel-syms-rt - update to 6.4.0-150600.10.34.1
kernel-rt-livepatch-devel - update to 6.4.0-150600.10.34.1
kernel-rt_debug-vdso-debuginfo - update to 6.4.0-150600.10.34.1
kernel-rt-optional-debuginfo - update to 6.4.0-150600.10.34.1
kernel-rt-debuginfo - update to 6.4.0-150600.10.34.1
kselftests-kmp-rt-debuginfo - update to 6.4.0-150600.10.34.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150600.10.34.1
dtb-rockchip - update to 6.4.0-150600.23.47.1
dtb-sprd - update to 6.4.0-150600.23.47.1
dtb-apple - update to 6.4.0-150600.23.47.1
kernel-obs-build-debugsource - update to 6.4.0-150600.23.47.1
dtb-freescale - update to 6.4.0-150600.23.47.1
kernel-obs-qa - update to 6.4.0-150600.23.47.1
dtb-apm - update to 6.4.0-150600.23.47.1
dtb-hisilicon - update to 6.4.0-150600.23.47.1
dtb-amd - update to 6.4.0-150600.23.47.1
dtb-amazon - update to 6.4.0-150600.23.47.1
dtb-marvell - update to 6.4.0-150600.23.47.1
dtb-aarch64 - update to 6.4.0-150600.23.47.1
dtb-mediatek - update to 6.4.0-150600.23.47.1
dtb-xilinx - update to 6.4.0-150600.23.47.1
dtb-allwinner - update to 6.4.0-150600.23.47.1
dtb-renesas - update to 6.4.0-150600.23.47.1
kernel-docs - update to 6.4.0-150600.23.47.1
dtb-altera - update to 6.4.0-150600.23.47.1
kernel-obs-build - update to 6.4.0-150600.23.47.1
kernel-docs-html - update to 6.4.0-150600.23.47.1
dtb-socionext - update to 6.4.0-150600.23.47.1
dtb-arm - update to 6.4.0-150600.23.47.1
dtb-broadcom - update to 6.4.0-150600.23.47.1
dtb-amlogic - update to 6.4.0-150600.23.47.1
dtb-cavium - update to 6.4.0-150600.23.47.1
dtb-exynos - update to 6.4.0-150600.23.47.1
dtb-lg - update to 6.4.0-150600.23.47.1
kernel-syms - update to 6.4.0-150600.23.47.1
dtb-nvidia - update to 6.4.0-150600.23.47.1
dtb-qcom - update to 6.4.0-150600.23.47.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.47.2
kernel-default-debugsource - update to 6.4.0-150600.23.47.2
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.47.2
kernel-64kb-debugsource - update to 6.4.0-150600.23.47.2
kernel-64kb - update to 6.4.0-150600.23.47.2
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.47.2
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.47.2
gfs2-kmp-64kb - update to 6.4.0-150600.23.47.2
kernel-64kb-optional - update to 6.4.0-150600.23.47.2
reiserfs-kmp-64kb - update to 6.4.0-150600.23.47.2
dlm-kmp-64kb - update to 6.4.0-150600.23.47.2
cluster-md-kmp-64kb - update to 6.4.0-150600.23.47.2
kernel-64kb-debuginfo - update to 6.4.0-150600.23.47.2
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.47.2
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.47.2
ocfs2-kmp-64kb - update to 6.4.0-150600.23.47.2
kernel-source - update to 6.4.0-150600.23.47.2
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.47.2
kernel-default-extra-debuginfo - update to 6.4.0-150600.23.47.2
kselftests-kmp-default - update to 6.4.0-150600.23.47.2
reiserfs-kmp-default - update to 6.4.0-150600.23.47.2
cluster-md-kmp-default-debuginfo - update to 6.4.0-150600.23.47.2
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.47.2
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.47.2
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.47.2
kernel-64kb-devel-debuginfo - update to 6.4.0-150600.23.47.2
kernel-macros - update to 6.4.0-150600.23.47.2
kernel-source-vanilla - update to 6.4.0-150600.23.47.2
kernel-devel - update to 6.4.0-150600.23.47.2
gfs2-kmp-default-debuginfo - update to 6.4.0-150600.23.47.2
kernel-kvmsmall-devel - update to 6.4.0-150600.23.47.2
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.47.2
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.47.2
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.47.2
kernel-debug-vdso - update to 6.4.0-150600.23.47.2
kernel-default-vdso - update to 6.4.0-150600.23.47.2
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.47.2
kernel-debug-devel - update to 6.4.0-150600.23.47.2
kernel-debug-debuginfo - update to 6.4.0-150600.23.47.2
kernel-debug-debugsource - update to 6.4.0-150600.23.47.2
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.47.2
kernel-debug - update to 6.4.0-150600.23.47.2
kernel-zfcpdump - update to 6.4.0-150600.23.47.2
reiserfs-kmp-default-debuginfo - update to 6.4.0-150600.23.47.2
kernel-default-debuginfo - update to 6.4.0-150600.23.47.2
ocfs2-kmp-default - update to 6.4.0-150600.23.47.2
kernel-default-devel-debuginfo - update to 6.4.0-150600.23.47.2
ocfs2-kmp-default-debuginfo - update to 6.4.0-150600.23.47.2
kernel-default - update to 6.4.0-150600.23.47.2
kernel-default-livepatch-devel - update to 6.4.0-150600.23.47.2
kernel-kvmsmall - update to 6.4.0-150600.23.47.2
kernel-default-optional - update to 6.4.0-150600.23.47.2
kernel-zfcpdump-debugsource - update to 6.4.0-150600.23.47.2
kernel-zfcpdump-debuginfo - update to 6.4.0-150600.23.47.2
kselftests-kmp-64kb - update to 6.4.0-150600.23.47.2
kernel-64kb-devel - update to 6.4.0-150600.23.47.2
kernel-64kb-extra - update to 6.4.0-150600.23.47.2
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.47.2
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.47.2
dlm-kmp-default - update to 6.4.0-150600.23.47.2
gfs2-kmp-default - update to 6.4.0-150600.23.47.2
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.47.2
dlm-kmp-default-debuginfo - update to 6.4.0-150600.23.47.2
cluster-md-kmp-default - update to 6.4.0-150600.23.47.2
kernel-default-devel - update to 6.4.0-150600.23.47.2
kernel-default-extra - update to 6.4.0-150600.23.47.2
kernel-default-livepatch - update to 6.4.0-150600.23.47.2
kernel-default-base - update to 6.4.0-150600.23.47.2.150600.12.20.2
kernel-default-base-rebuild - update to 6.4.0-150600.23.47.2.150600.12.20.2
linux (Ubuntu package) - addressed in versions 6.8.0-64.67, 6.8.0-1031.31, 6.8.0-1032.34~22.04.1, 6.11.0-26.26, 6.11.0-26.26~24.04.1, 6.11.0-1010.10, 6.11.0-1013.13, 6.11.0-1015.15, 6.11.0-1015.15~24.04.1, 6.11.0-1022.22
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-64.67.1, 6.8.0-64.67.1~22.04.1, 6.8.0-1029.29, 6.8.0-1029.29~22.04.1
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-64.67~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1015.17, 6.8.0-1028.32, 6.8.0-1029.30, 6.8.0-1029.30~22.04.1, 6.8.0-1031.34, 6.8.0-1031.34.1, 6.8.0-1031.34~22.04.1, 6.8.0-1032.34~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1022.23, 6.8.0-1034.39, 6.8.0-1034.39~22.04.1
linux-raspi (Ubuntu package) - update to 6.8.0-1031.35
linux-gcp (Ubuntu package) - addressed in versions 6.8.0-1033.35, 6.8.0-1033.35~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2026.27
linux-realtime (Ubuntu package) - update to 6.8.1-1025.26
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1014.15, 6.11.0-1014.15~24.04.1, 6.11.0-1016.17
linux-aws (Ubuntu package) - update to 6.11.0-1014.15

External References

Related Security Bulletins