Improper input validation in Linux kernel - CVE-2026-74544

Vulnerability identifier: #VU143242

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-2026-74544

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper input validation in the cls_u32 packet classifier when processing a crafted filter configuration with varoffset enabled. A local user can supply an out-of-range offshift value to trigger shift-out-of-bounds behavior and cause a denial of service.

Exploitation is possible by an unprivileged user via user or network namespaces.

Linux kernel
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Live Patching
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
openEuler
Ubuntu
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
kgraft-patch-4_12_14-122_336-default
kernel-livepatch-6_4_0-150700_7_81-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_22-debugsource
kernel-livepatch-6_4_0-150700_7_81-rt
kernel-livepatch-6_4_0-150700_53_87-default
kernel-livepatch-6_4_0-150700_53_87-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_23-debugsource
kernel-default-man
kernel-default-base-debuginfo
kernel-default-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-debugsource
kernel-default
ocfs2-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
dlm-kmp-default-debuginfo
ocfs2-kmp-default
gfs2-kmp-default
kernel-syms
kernel-default-devel
dlm-kmp-default
kernel-default-devel-debuginfo
kernel-source
kernel-macros
kernel-devel
kernel-default-base
gfs2-kmp-default-debuginfo
cluster-md-kmp-default
dlm-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-rt-devel
gfs2-kmp-rt
ocfs2-kmp-rt
kernel-rt-debugsource
kernel-rt-devel-debuginfo
kernel-rt
kernel-source-rt
kernel-devel-rt
dlm-kmp-rt-debuginfo
kernel-syms-rt
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-obs-build
kernel-obs-build-debugsource
kernel-azure
kernel-default-livepatch
kernel-azure-debugsource
kernel-default-livepatch-devel
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-azure-devel
kernel-default-extra
kernel-default-extra-debuginfo
kernel-docs
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-64kb
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-64kb-debuginfo
kernel-64kb-debugsource
bpftool
python3-perf-debuginfo
kernel
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-extra-modules
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
linux-nvidia-tegra (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
kgraft-patch-4_12_14-122_336-default - update to 1-8.3.1
kernel-livepatch-6_4_0-150700_7_81-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_22-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_81-rt - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_87-default - update to 1-150700.15.3.2
kernel-livepatch-6_4_0-150700_53_87-default-debuginfo - update to 1-150700.15.3.2
kernel-livepatch-SLE15-SP7_Update_23-debugsource - update to 1-150700.15.3.2
kernel-default-man - update to 4.12.14-122.336.1
kernel-default-base-debuginfo - update to 4.12.14-122.336.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
kernel-default-kgraft-devel - update to 4.12.14-122.336.1
kernel-default-kgraft - update to 4.12.14-122.336.1
kernel-default-debugsource - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
kernel-default - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
ocfs2-kmp-default - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
gfs2-kmp-default - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
kernel-syms - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.1
kernel-default-devel - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
dlm-kmp-default - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
kernel-source - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
kernel-macros - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
kernel-devel - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
kernel-default-base - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3.150700.17.49.2
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
cluster-md-kmp-default - addressed in versions 4.12.14-122.336.1, 6.4.0-150700.53.87.3
dlm-kmp-rt - update to 6.4.0-150700.7.81.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.81.1
kernel-rt-devel - update to 6.4.0-150700.7.81.1
gfs2-kmp-rt - update to 6.4.0-150700.7.81.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.81.1
kernel-rt-debugsource - update to 6.4.0-150700.7.81.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.81.1
kernel-rt - update to 6.4.0-150700.7.81.1
kernel-source-rt - update to 6.4.0-150700.7.81.1
kernel-devel-rt - update to 6.4.0-150700.7.81.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.81.1
kernel-syms-rt - update to 6.4.0-150700.7.81.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.81.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.81.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.81.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.81.1
kernel-obs-build - update to 6.4.0-150700.53.87.2
kernel-obs-build-debugsource - update to 6.4.0-150700.53.87.2
kernel-azure - update to 6.4.0-150700.53.87.3
kernel-default-livepatch - update to 6.4.0-150700.53.87.3
kernel-azure-debugsource - update to 6.4.0-150700.53.87.3
kernel-default-livepatch-devel - update to 6.4.0-150700.53.87.3
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.87.3
kernel-azure-debuginfo - update to 6.4.0-150700.53.87.3
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.87.3
reiserfs-kmp-default - update to 6.4.0-150700.53.87.3
kernel-azure-devel - update to 6.4.0-150700.53.87.3
kernel-default-extra - update to 6.4.0-150700.53.87.3
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.87.3
kernel-docs - update to 6.4.0-150700.53.87.3
kernel-zfcpdump - update to 6.4.0-150700.53.87.3
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.87.3
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.87.3
kernel-64kb - update to 6.4.0-150700.53.87.3
kernel-64kb-devel - update to 6.4.0-150700.53.87.3
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.87.3
kernel-64kb-debuginfo - update to 6.4.0-150700.53.87.3
kernel-64kb-debugsource - update to 6.4.0-150700.53.87.3
bpftool - update to 6.6.0-145.3.31.162
python3-perf-debuginfo - update to 6.6.0-145.3.31.162
kernel - update to 6.6.0-145.3.31.162
bpftool-debuginfo - update to 6.6.0-145.3.31.162
kernel-debuginfo - update to 6.6.0-145.3.31.162
kernel-debugsource - update to 6.6.0-145.3.31.162
kernel-devel - update to 6.6.0-145.3.31.162
kernel-extra-modules - update to 6.6.0-145.3.31.162
kernel-headers - update to 6.6.0-145.3.31.162
kernel-source - update to 6.6.0-145.3.31.162
kernel-tools - update to 6.6.0-145.3.31.162
kernel-tools-debuginfo - update to 6.6.0-145.3.31.162
kernel-tools-devel - update to 6.6.0-145.3.31.162
perf - update to 6.6.0-145.3.31.162
perf-debuginfo - update to 6.6.0-145.3.31.162
python3-perf - update to 6.6.0-145.3.31.162
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux (Debian package) - update to 6.12.115-2

• https://git.kernel.org/stable/c/313cb9ffc4101a885d791facf4b5ea3d5e06144d
• https://git.kernel.org/stable/c/aef96eead2860cbfa371e4471d4f04412213b958

• Improper input validation in Linux kernel sched
• openEuler 24.03 LTS SP3 update for kernel
• Ubuntu update for linux-nvidia-tegra
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more