Integer underflow in Linux kernel - CVE-2025-40190

Vulnerability identifier: #VU118495

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-40190

CWE-ID: CWE-191

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to integer underflow within the ext4_xattr_inode_update_ref() function in fs/ext4/xattr.c. A local user can execute arbitrary code.

Linux kernel
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
Public Cloud Module
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
SUSE Linux Enterprise Live Patching
openEuler
kernel-livepatch-6_4_0-150700_7_28-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_28-rt
kernel-livepatch-SLE15-SP7-RT_Update_8-debugsource
kernel-livepatch-SLE15-SP7_Update_8-debugsource
kernel-livepatch-6_4_0-150700_53_28-default-debuginfo
kernel-livepatch-6_4_0-150700_53_28-default
gfs2-kmp-rt
kernel-source-rt
kernel-devel-rt
kernel-rt
dlm-kmp-rt
kernel-rt-devel-debuginfo
kernel-rt-debugsource
cluster-md-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt-devel
kernel-rt-debuginfo
ocfs2-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-syms-rt
kernel-azure-devel
kernel-source-azure
kernel-devel-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-syms-azure
kernel-azure
kernel-default
kernel-default-debuginfo
kernel-default-livepatch
kernel-docs
kernel-default-extra-debuginfo
gfs2-kmp-default-debuginfo
gfs2-kmp-default
ocfs2-kmp-default
cluster-md-kmp-default-debuginfo
cluster-md-kmp-default
ocfs2-kmp-default-debuginfo
dlm-kmp-default
dlm-kmp-default-debuginfo
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-source
kernel-obs-build
kernel-obs-build-debugsource
kernel-syms
kernel-default-extra
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-devel
kernel-macros
kernel-default-devel
kernel-default-devel-debuginfo
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-64kb-debugsource
kernel-64kb-debuginfo
kernel-64kb
kernel-default-livepatch-devel
kernel-default-debugsource
kernel-default-base
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-extra-modules

Install update from vendor's repository.

kernel-livepatch-6_4_0-150700_7_28-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_28-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_8-debugsource - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7_Update_8-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_28-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_28-default - update to 1-150700.15.3.1
gfs2-kmp-rt - update to 6.4.0-150700.7.28.1
kernel-source-rt - update to 6.4.0-150700.7.28.1
kernel-devel-rt - update to 6.4.0-150700.7.28.1
kernel-rt - update to 6.4.0-150700.7.28.1
dlm-kmp-rt - update to 6.4.0-150700.7.28.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.28.1
kernel-rt-debugsource - update to 6.4.0-150700.7.28.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.28.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.28.1
kernel-rt-devel - update to 6.4.0-150700.7.28.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.28.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.28.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.28.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.28.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.28.1
kernel-syms-rt - update to 6.4.0-150700.7.28.1
kernel-azure-devel - update to 6.4.0-150700.20.24.1
kernel-source-azure - update to 6.4.0-150700.20.24.1
kernel-devel-azure - update to 6.4.0-150700.20.24.1
kernel-azure-debugsource - update to 6.4.0-150700.20.24.1
kernel-azure-debuginfo - update to 6.4.0-150700.20.24.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.20.24.1
kernel-syms-azure - update to 6.4.0-150700.20.24.1
kernel-azure - update to 6.4.0-150700.20.24.1
kernel-default - update to 6.4.0-150700.53.28.1
kernel-default-debuginfo - update to 6.4.0-150700.53.28.1
kernel-default-livepatch - update to 6.4.0-150700.53.28.1
kernel-docs - update to 6.4.0-150700.53.28.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.28.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.28.1
gfs2-kmp-default - update to 6.4.0-150700.53.28.1
ocfs2-kmp-default - update to 6.4.0-150700.53.28.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.28.1
cluster-md-kmp-default - update to 6.4.0-150700.53.28.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.28.1
dlm-kmp-default - update to 6.4.0-150700.53.28.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.28.1
reiserfs-kmp-default - update to 6.4.0-150700.53.28.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.28.1
kernel-source - update to 6.4.0-150700.53.28.1
kernel-obs-build - update to 6.4.0-150700.53.28.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.28.1
kernel-syms - update to 6.4.0-150700.53.28.1
kernel-default-extra - update to 6.4.0-150700.53.28.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.28.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.28.1
kernel-zfcpdump - update to 6.4.0-150700.53.28.1
kernel-devel - update to 6.4.0-150700.53.28.1
kernel-macros - update to 6.4.0-150700.53.28.1
kernel-default-devel - update to 6.4.0-150700.53.28.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.28.1
kernel-64kb-devel - update to 6.4.0-150700.53.28.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.28.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.28.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.28.1
kernel-64kb - update to 6.4.0-150700.53.28.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.28.1
kernel-default-debugsource - update to 6.4.0-150700.53.28.1
kernel-default-base - update to 6.4.0-150700.53.28.1.150700.17.19.1
kernel - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
bpftool - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
bpftool-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-debugsource - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-devel - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-headers - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-source - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-tools - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-tools-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-tools-devel - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
perf - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
perf-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
python3-perf - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
python3-perf-debuginfo - addressed in versions 6.6.0-121.0.0.111, 6.6.0-121.0.0.123, 6.6.0-121.0.0.124
kernel-extra-modules - update to 6.6.0-121.0.0.124

• https://git.kernel.org/stable/c/1cfb3e4ddbdc8e02e637b8852540bd4718bf4814
• https://git.kernel.org/stable/c/3d6269028246f4484bfed403c947a114bb583631
• https://git.kernel.org/stable/c/440b003f449a4ff2a00b08c8eab9ba5cd28f3943
• https://git.kernel.org/stable/c/505e69f76ac497e788f4ea0267826ec7266b40c8
• https://git.kernel.org/stable/c/57295e835408d8d425bef58da5253465db3d6888
• https://git.kernel.org/stable/c/6b879c4c6bbaab03c0ad2a983953bd1410bb165e
• https://git.kernel.org/stable/c/79ea7f3e11effe1bd9e753172981d9029133a278
• https://git.kernel.org/stable/c/ea39e712c2f5ae148ee5515798ae03523673e002

• Integer underflow in Linux kernel ext4
• openEuler 24.03 LTS SP1 update for kernel
• openEuler 24.03 LTS update for kernel
• openEuler 24.03 LTS SP2 update for kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel