Memory leak in Linux kernel - CVE-2025-40103

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Main Vulnerability Database Vulnerabilities #VU117844

Memory leak in Linux kernel - CVE-2025-40103

Published: October 31, 2025


Vulnerability identifier: #VU117844
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-40103
CWE-ID: CWE-401
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 memory leak within the get_smb2_acl_by_path() and set_smb2_acl() functions in fs/smb/client/smb2ops.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 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 Workstation Extension 15
SUSE Linux Enterprise Live Patching
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
openSUSE Leap
Ubuntu
openEuler
kernel-livepatch-6_4_0-150600_23_92-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_21-debugsource
kernel-livepatch-6_4_0-150600_23_92-default
kernel-livepatch-SLE15-SP7-RT_Update_10-debugsource
kernel-livepatch-6_4_0-150700_7_34-rt
kernel-livepatch-6_4_0-150700_7_34-rt-debuginfo
kernel-livepatch-SLE15-SP7_Update_10-debugsource
kernel-livepatch-6_4_0-150700_53_34-default
kernel-livepatch-6_4_0-150700_53_34-default-debuginfo
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-raspi (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux (Debian package)
dtb-rockchip
kernel-64kb-optional
dtb-socionext
dlm-kmp-64kb-debuginfo
dtb-apple
gfs2-kmp-64kb
kselftests-kmp-64kb
reiserfs-kmp-64kb
dtb-mediatek
dtb-cavium
dtb-amlogic
reiserfs-kmp-64kb-debuginfo
dtb-apm
dtb-sprd
dtb-amd
dtb-amazon
kernel-default-extra-debuginfo
dtb-aarch64
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-kvmsmall
kernel-default
kselftests-kmp-default
gfs2-kmp-default
kernel-default-optional-debuginfo
ocfs2-kmp-default-debuginfo
dtb-exynos
kernel-64kb
dtb-xilinx
dtb-allwinner
dtb-lg
ocfs2-kmp-64kb-debuginfo
dlm-kmp-64kb
dtb-nvidia
ocfs2-kmp-64kb
kernel-64kb-optional-debuginfo
dtb-marvell
dtb-altera
dtb-broadcom
kernel-64kb-devel
dtb-arm
cluster-md-kmp-64kb-debuginfo
gfs2-kmp-64kb-debuginfo
dtb-qcom
dtb-freescale
kselftests-kmp-64kb-debuginfo
kernel-64kb-extra-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb-extra
cluster-md-kmp-64kb
kernel-64kb-debugsource
dtb-hisilicon
dtb-renesas
kernel-64kb-debuginfo
kernel-debug-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-debug-vdso
kernel-kvmsmall-vdso
kernel-debug-vdso-debuginfo
kernel-default-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-default-vdso-debuginfo
kernel-debug-devel
kernel-debug-debugsource
reiserfs-kmp-default
kernel-debug-debuginfo
kernel-debug
kernel-devel
kernel-macros
kernel-source
kernel-source-vanilla
kernel-docs-html
kernel-docs
kernel-default-livepatch-devel
ocfs2-kmp-default
kernel-kvmsmall-devel
kernel-obs-qa
kselftests-kmp-default-debuginfo
kernel-default-optional
dlm-kmp-default
kernel-syms
kernel-default-debugsource
kernel-default-devel-debuginfo
reiserfs-kmp-default-debuginfo
kernel-default-devel
dlm-kmp-default-debuginfo
kernel-obs-build-debugsource
cluster-md-kmp-default-debuginfo
kernel-default-debuginfo
kernel-obs-build
kernel-default-livepatch
kernel-default-extra
gfs2-kmp-default-debuginfo
cluster-md-kmp-default
kernel-default-base
kernel-default-base-rebuild
ocfs2-kmp-rt
kernel-rt-devel
kernel-rt-debuginfo
gfs2-kmp-rt
kernel-syms-rt
ocfs2-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-debugsource
cluster-md-kmp-rt
dlm-kmp-rt-debuginfo
dlm-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-devel-rt
kernel-source-rt
gfs2-kmp-rt-debuginfo
kernel-rt
kernel-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-debugsource
kernel-extra-modules
linux-aws-fips (Ubuntu package)
linux-xilinx (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oem-6.17 (Ubuntu package)

How to mitigate CVE-2025-40103

Install update from vendor's repository.

kernel-livepatch-6_4_0-150600_23_92-default-debuginfo - update to 1-150600.13.5.1
kernel-livepatch-SLE15-SP6_Update_21-debugsource - update to 1-150600.13.5.1
kernel-livepatch-6_4_0-150600_23_92-default - update to 1-150600.13.5.1
kernel-livepatch-SLE15-SP7-RT_Update_10-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_34-rt - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_34-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7_Update_10-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_34-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_34-default-debuginfo - update to 1-150700.15.3.1
linux (Ubuntu package) - addressed in versions 5.15.0.184.155, 5.15.0-184.194, 5.15.0-184.194~20.04.1, 5.15.0.186.166, 5.15.0-186.196, 5.15.0-186.196~20.04.1, 5.15.0.1075.78, 5.15.0-1075.79, 5.15.0.1095.94, 5.15.0-1095.103, 5.15.0.1104.100, 5.15.0-1104.109, 5.15.0.1108.107, 5.15.0-1108.114, 5.15.0.1111.115, 5.15.0-1111.120+fips1, 5.15.0.1112.102, 5.15.0.1112.109, 5.15.0-1112.122, 5.15.0-1112.122+fips1, 6.8.0-106.106, 6.8.0-106.106.1, 6.8.0-106.106.1~22.04.1, 6.8.0-106.106~22.04.1, 6.8.0-1035.38, 6.8.0-1047.48, 6.8.0-1047.48~22.04.1, 6.8.0-1048.53, 6.8.0-1049.49, 6.8.0-1049.49~22.04.1, 6.8.0-1050.53, 6.8.0-1052.55, 6.8.0-1052.55~22.04.1, 6.17.0-14.14, 6.17.0-1006.7, 6.17.0-1008.8
linux-aws (Ubuntu package) - addressed in versions 5.15.0.186.109, 5.15.0-186.196+fips1, 5.15.0.1106.103, 5.15.0-1106.110, 5.15.0.1107.107, 5.15.0-1107.108, 5.15.0.1112.108, 5.15.0.1112.115, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0-1112.119~20.04.1, 6.17.0-1007.7
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0.1053.55, 5.15.0.1064.64, 5.15.0-1064.66
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1104.106, 5.15.0.1104.108, 5.15.0-1107.113~20.04.1
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1106.104, 5.15.0-1106.109, 6.8.0-1050.54, 6.8.0-2040.41
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1106.110~20.04.1
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1107.106, 5.15.0-1107.113
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.105, 5.15.0-1109.115, 5.15.0.1117.115, 5.15.0-1117.126, 6.8.0-1051.57, 6.17.0-1008.8
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1109.115~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1112.122~20.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1117.102, 5.15.0-1117.126+fips1, 6.8.0-1052.58+fips1
linux-azure-fde (Ubuntu package) - update to 5.15.0-1117.126
linux (Debian package) - update to 6.1.158-1
dtb-rockchip - update to 6.4.0-150600.23.92.1
kernel-64kb-optional - update to 6.4.0-150600.23.92.1
dtb-socionext - update to 6.4.0-150600.23.92.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
dtb-apple - update to 6.4.0-150600.23.92.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.92.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.92.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.92.1
dtb-mediatek - update to 6.4.0-150600.23.92.1
dtb-cavium - update to 6.4.0-150600.23.92.1
dtb-amlogic - update to 6.4.0-150600.23.92.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
dtb-apm - update to 6.4.0-150600.23.92.1
dtb-sprd - update to 6.4.0-150600.23.92.1
dtb-amd - update to 6.4.0-150600.23.92.1
dtb-amazon - update to 6.4.0-150600.23.92.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
dtb-aarch64 - update to 6.4.0-150600.23.92.1
kernel-zfcpdump-debugsource - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-zfcpdump-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-zfcpdump - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-kvmsmall - update to 6.4.0-150600.23.92.1
kernel-default - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kselftests-kmp-default - update to 6.4.0-150600.23.92.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.92.1
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
dtb-exynos - update to 6.4.0-150600.23.92.1
kernel-64kb - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
dtb-xilinx - update to 6.4.0-150600.23.92.1
dtb-allwinner - update to 6.4.0-150600.23.92.1
dtb-lg - update to 6.4.0-150600.23.92.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
dlm-kmp-64kb - update to 6.4.0-150600.23.92.1
dtb-nvidia - update to 6.4.0-150600.23.92.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.92.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.92.1
dtb-marvell - update to 6.4.0-150600.23.92.1
dtb-altera - update to 6.4.0-150600.23.92.1
dtb-broadcom - update to 6.4.0-150600.23.92.1
kernel-64kb-devel - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
dtb-arm - update to 6.4.0-150600.23.92.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
dtb-qcom - update to 6.4.0-150600.23.92.1
dtb-freescale - update to 6.4.0-150600.23.92.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.92.1
kernel-64kb-devel-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-64kb-extra - update to 6.4.0-150600.23.92.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.92.1
kernel-64kb-debugsource - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
dtb-hisilicon - update to 6.4.0-150600.23.92.1
dtb-renesas - update to 6.4.0-150600.23.92.1
kernel-64kb-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.92.1
kernel-debug-vdso - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.92.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.92.1
kernel-default-vdso - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.92.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.92.1
kernel-debug-devel - update to 6.4.0-150600.23.92.1
kernel-debug-debugsource - update to 6.4.0-150600.23.92.1
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.92.1
kernel-debug - update to 6.4.0-150600.23.92.1
kernel-devel - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-macros - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-source - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-source-vanilla - update to 6.4.0-150600.23.92.1
kernel-docs-html - update to 6.4.0-150600.23.92.1
kernel-docs - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
ocfs2-kmp-default - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.92.1
kernel-obs-qa - update to 6.4.0-150600.23.92.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.92.1
kernel-default-optional - update to 6.4.0-150600.23.92.1
dlm-kmp-default - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-syms - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-debugsource - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-devel-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
reiserfs-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-devel - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
dlm-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-obs-build - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-livepatch - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
gfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-base - addressed in versions 6.4.0-150600.23.92.1.150600.12.42.2, 6.4.0-150700.53.34.1.150700.17.23.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.92.1.150600.12.42.2
ocfs2-kmp-rt - update to 6.4.0-150700.7.34.1
kernel-rt-devel - update to 6.4.0-150700.7.34.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.34.1
gfs2-kmp-rt - update to 6.4.0-150700.7.34.1
kernel-syms-rt - update to 6.4.0-150700.7.34.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.34.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.34.1
kernel-rt-debugsource - update to 6.4.0-150700.7.34.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.34.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.34.1
dlm-kmp-rt - update to 6.4.0-150700.7.34.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.34.1
kernel-devel-rt - update to 6.4.0-150700.7.34.1
kernel-source-rt - update to 6.4.0-150700.7.34.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.34.1
kernel-rt - update to 6.4.0-150700.7.34.1
kernel-azure - update to 6.4.0-150700.53.34.1
kernel-azure-debugsource - update to 6.4.0-150700.53.34.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.34.1
kernel-azure-devel - update to 6.4.0-150700.53.34.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.34.1
kernel-headers - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-source - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-tools - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-tools-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-tools-devel - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
perf - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
perf-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
python3-perf - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
python3-perf-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
bpftool-debuginfo - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
bpftool - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-devel - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-debugsource - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
kernel-extra-modules - update to 6.6.0-138.0.0.132
linux-aws-fips (Ubuntu package) - addressed in versions 6.8.0-106.106+fips1, 6.8.0-1050.53+fips1, 6.8.0-1052.55+fips1
linux-xilinx (Ubuntu package) - update to 6.8.0-1029.30
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1049.52, 6.8.0-1049.52.1, 6.8.0-1049.52~22.04.1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1050.53~22.04.1
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-realtime (Ubuntu package) - addressed in versions 6.8.1-1045.46, 6.8.1-1045.46~22.04.1
linux-gcp (Ubuntu package) - update to 6.17.0-1007.7
linux-oem-6.17 (Ubuntu package) - update to 6.17.0-1011.11

External References

Related Security Bulletins