Out-of-bounds read in Linux kernel - CVE-2025-40099

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Main Vulnerability Database Vulnerabilities #VU117847

Out-of-bounds read in Linux kernel - CVE-2025-40099

Published: October 31, 2025


Vulnerability identifier: #VU117847
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-2025-40099
CWE-ID: CWE-125
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 an out-of-bounds read error within the parse_dfs_referrals() function in fs/smb/client/misc.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 Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem 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-6_4_0-150700_7_34-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_34-rt
kernel-livepatch-SLE15-SP7-RT_Update_10-debugsource
kernel-livepatch-6_4_0-150700_53_34-default-debuginfo
kernel-livepatch-6_4_0-150700_53_34-default
kernel-livepatch-SLE15-SP7_Update_10-debugsource
linux (Debian package)
kernel-obs-qa
kselftests-kmp-default-debuginfo
kernel-default-optional
dtb-aarch64
reiserfs-kmp-default
dlm-kmp-default
ocfs2-kmp-default
kernel-default-extra-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-optional-debuginfo
gfs2-kmp-default
kselftests-kmp-default
kernel-default
kernel-kvmsmall
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-kvmsmall-vdso
kernel-obs-build
kernel-default-vdso
kernel-debug-vdso
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-kvmsmall-devel
gfs2-kmp-default-debuginfo
kernel-default-extra
kernel-default-livepatch
kernel-syms
kernel-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-obs-build-debugsource
cluster-md-kmp-default
dlm-kmp-default-debuginfo
kernel-default-devel
reiserfs-kmp-default-debuginfo
kernel-default-devel-debuginfo
kernel-default-debugsource
dtb-altera
kernel-64kb-extra
kernel-64kb-devel-debuginfo
kernel-64kb-extra-debuginfo
kselftests-kmp-64kb-debuginfo
dtb-freescale
dtb-qcom
gfs2-kmp-64kb-debuginfo
cluster-md-kmp-64kb-debuginfo
dtb-exynos
dtb-broadcom
cluster-md-kmp-64kb
dtb-marvell
kernel-64kb-optional-debuginfo
ocfs2-kmp-64kb
dtb-nvidia
dlm-kmp-64kb
ocfs2-kmp-64kb-debuginfo
dtb-lg
dtb-allwinner
dtb-xilinx
kernel-64kb
dtb-cavium
dtb-amd
dtb-sprd
dtb-rockchip
dtb-socionext
dlm-kmp-64kb-debuginfo
dtb-apple
gfs2-kmp-64kb
kselftests-kmp-64kb
reiserfs-kmp-64kb
dtb-mediatek
dtb-amazon
dtb-amlogic
reiserfs-kmp-64kb-debuginfo
dtb-apm
kernel-64kb-optional
dtb-arm
kernel-64kb-debuginfo
dtb-renesas
kernel-64kb-devel
dtb-hisilicon
kernel-64kb-debugsource
kernel-debug-vdso-debuginfo
kernel-default-livepatch-devel
kernel-docs
kernel-docs-html
kernel-source-vanilla
kernel-source
kernel-macros
kernel-devel
kernel-debug
kernel-debug-devel-debuginfo
kernel-debug-debugsource
kernel-debug-devel
kernel-default-vdso-debuginfo
kernel-kvmsmall-vdso-debuginfo
kernel-debug-debuginfo
kernel-default-base
kernel-default-base-rebuild
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt-devel
kernel-rt-devel-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-syms-rt
gfs2-kmp-rt
kernel-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-debugsource
dlm-kmp-rt-debuginfo
dlm-kmp-rt
cluster-md-kmp-rt
kernel-devel-rt
kernel-source-rt
kernel-rt
kernel-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel
kernel-azure-devel-debuginfo
perf
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-extra-modules
linux (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-xilinx (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-oem-6.17 (Ubuntu package)

How to mitigate CVE-2025-40099

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-6_4_0-150700_7_34-rt-debuginfo - 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-SLE15-SP7-RT_Update_10-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_34-default-debuginfo - 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-SLE15-SP7_Update_10-debugsource - update to 1-150700.15.3.1
linux (Debian package) - update to 6.1.158-1
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
dtb-aarch64 - 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
dlm-kmp-default - 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-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
ocfs2-kmp-default-debuginfo - 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
gfs2-kmp-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
kernel-default - 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-zfcpdump - 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-debugsource - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.92.1
kernel-obs-build - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-default-vdso - update to 6.4.0-150600.23.92.1
kernel-debug-vdso - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.92.1
gfs2-kmp-default-debuginfo - 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
kernel-default-livepatch - 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-debuginfo - 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-obs-build-debugsource - 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
dlm-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
reiserfs-kmp-default-debuginfo - 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
kernel-default-debugsource - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
dtb-altera - update to 6.4.0-150600.23.92.1
kernel-64kb-extra - 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-debuginfo - update to 6.4.0-150600.23.92.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
dtb-freescale - update to 6.4.0-150600.23.92.1
dtb-qcom - update to 6.4.0-150600.23.92.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
dtb-exynos - update to 6.4.0-150600.23.92.1
dtb-broadcom - update to 6.4.0-150600.23.92.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.92.1
dtb-marvell - update to 6.4.0-150600.23.92.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.92.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.92.1
dtb-nvidia - update to 6.4.0-150600.23.92.1
dlm-kmp-64kb - update to 6.4.0-150600.23.92.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.92.1
dtb-lg - update to 6.4.0-150600.23.92.1
dtb-allwinner - update to 6.4.0-150600.23.92.1
dtb-xilinx - 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-cavium - update to 6.4.0-150600.23.92.1
dtb-amd - update to 6.4.0-150600.23.92.1
dtb-sprd - update to 6.4.0-150600.23.92.1
dtb-rockchip - 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-amazon - 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
kernel-64kb-optional - update to 6.4.0-150600.23.92.1
dtb-arm - 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
dtb-renesas - 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-hisilicon - 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
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.92.1
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-docs - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-docs-html - update to 6.4.0-150600.23.92.1
kernel-source-vanilla - update to 6.4.0-150600.23.92.1
kernel-source - 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-devel - addressed in versions 6.4.0-150600.23.92.1, 6.4.0-150700.53.34.1
kernel-debug - update to 6.4.0-150600.23.92.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.92.1
kernel-debug-debugsource - update to 6.4.0-150600.23.92.1
kernel-debug-devel - update to 6.4.0-150600.23.92.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.92.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.92.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.92.1
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
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.34.1
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-devel-debuginfo - update to 6.4.0-150700.7.34.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.34.1
kernel-syms-rt - update to 6.4.0-150700.7.34.1
gfs2-kmp-rt - update to 6.4.0-150700.7.34.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.34.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.34.1
kernel-rt-debugsource - 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 - 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
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
perf - 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
bpftool - 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
kernel-debuginfo - 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-devel - addressed in versions 6.6.0-138.0.0.119, 6.6.0-138.0.0.132
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-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-extra-modules - update to 6.6.0-138.0.0.132
linux (Ubuntu package) - addressed in versions 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-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-raspi (Ubuntu package) - addressed in versions 6.8.0-1050.54, 6.8.0-2040.41
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1051.57, 6.17.0-1008.8
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1052.58+fips1
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-aws (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