ID:12880 - Exploit for Improper input validation in Linux kernel - CVE-2026-46243

Vulnerability identifier: #VU133226

Vulnerability risk: Low

CVE-ID: CVE-2026-46243

CWE-ID: CWE-20

Exploitation vector: Local access

Vulnerable software:
Linux kernel
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 11
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Red Hat Enterprise Linux for IBM z Systems
Anolis OS
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
SUSE Linux Enterprise Live Patching
Ubuntu
openSUSE Leap
openEuler
kpatch-patch-4_18_0-477_143_1 (Red Hat package)
kpatch-patch-4_18_0-553_125_1 (Red Hat package)
kpatch-patch-5_14_0-284_172_1 (Red Hat package)
kpatch-patch-5_14_0-427_126_1 (Red Hat package)
kpatch-patch-5_14_0-687_10_1 (Red Hat package)
kpatch-patch-4_18_0-477_130_1 (Red Hat package)
kpatch-patch-4_18_0-553_109_1 (Red Hat package)
kpatch-patch-5_14_0-284_158_1 (Red Hat package)
kpatch-patch-5_14_0-427_113_1 (Red Hat package)
kpatch-patch-4_18_0-477_120_1 (Red Hat package)
kpatch-patch-4_18_0-553_85_1 (Red Hat package)
kpatch-patch-5_14_0-284_148_1 (Red Hat package)
kpatch-patch-5_14_0-427_100_1 (Red Hat package)
kpatch-patch-4_18_0-477_107_1 (Red Hat package)
kpatch-patch-4_18_0-553_72_1 (Red Hat package)
kpatch-patch-5_14_0-284_134_1 (Red Hat package)
kpatch-patch-5_14_0-427_84_1 (Red Hat package)
kpatch-patch-4_18_0-477_97_1 (Red Hat package)
kpatch-patch-4_18_0-553_53_1 (Red Hat package)
kpatch-patch-5_14_0-427_68_2 (Red Hat package)
kpatch-patch-5_14_0-284_117_1 (Red Hat package)
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kernel-ec2-devel
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kernel-xen-debugsource
kernel-trace-debugsource
kernel-trace-devel-debuginfo
kernel-xen-devel
kernel-source
kernel-ec2-debuginfo
kernel-xen-devel-debuginfo
kernel-default-debugsource
kernel-trace-debuginfo
kernel-trace-devel
kernel-default-debuginfo
kernel-syms
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kernel-xen-debuginfo
kernel-default-devel-debuginfo
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kernel-trace-base
kernel-xen
kernel-trace
kernel-ec2
kernel-default
kernel-ec2-base
kernel-docs
kernel-default-base
kgraft-patch-4_12_14-122_310-default
kernel-rt (Red Hat package)
linux (Ubuntu package)
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linux-aws (Ubuntu package)
Red Hat OpenShift Container Platform
kernel (Red Hat package)
kernel-doc
bpftool
kernel
kernel-core
kernel-cross-headers
kernel-debug
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-devel
kernel-headers
kernel-modules-extra
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf
kernel-abi-stablelists
kernel-modules
python2-perf-debuginfo
python2-perf
perf-debuginfo
kernel-tools-devel
kernel-tools-debuginfo
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
python3-perf-debuginfo
kernel-livepatch-5_14_21-150400_24_209-default-debuginfo
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kernel-livepatch-6_4_0-150700_53_45-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_13-debugsource
kgraft-patch-4_12_14-122_302-default
linux-ibm (Ubuntu package)
linux-raspi (Ubuntu package)
linux-kvm (Ubuntu package)
kernel-rt-debuginfo
kernel-rt
kernel-rt-debugsource
kernel-source-rt
ocfs2-kmp-64kb-debuginfo
dlm-kmp-64kb
dtb-exynos
dtb-amazon
dtb-qcom
kernel-64kb-optional-debuginfo
kernel-64kb-optional
dtb-hisilicon
dtb-mediatek
kernel-64kb-devel
dtb-broadcom
dtb-renesas
dtb-lg
dtb-apm
dtb-amd
cluster-md-kmp-64kb
kernel-64kb-extra-debuginfo
kernel-64kb-debugsource
dtb-amlogic
kernel-64kb-devel-debuginfo
dtb-freescale
kernel-64kb
dtb-aarch64
kernel-kvmsmall
kernel-default-livepatch-devel
gfs2-kmp-64kb-debuginfo
kernel-64kb-extra
dtb-sprd
reiserfs-kmp-64kb-debuginfo
dtb-rockchip
ocfs2-kmp-64kb
cluster-md-kmp-64kb-debuginfo
dtb-arm
kernel-64kb-debuginfo
gfs2-kmp-64kb
dtb-xilinx
reiserfs-kmp-64kb
dtb-altera
gfs2-kmp-default
dlm-kmp-default
ocfs2-kmp-default
kernel-default-extra-debuginfo
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-obs-build
kernel-default-extra
gfs2-kmp-default-debuginfo
dtb-marvell
kernel-obs-build-debugsource
kernel-obs-qa
dlm-kmp-default-debuginfo
kselftests-kmp-default
cluster-md-kmp-default
kernel-default-livepatch
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kselftests-kmp-default-debuginfo
kernel-default-optional
kernel-zfcpdump
dtb-socionext
dlm-kmp-64kb-debuginfo
dtb-allwinner
dtb-apple
dtb-cavium
kselftests-kmp-64kb-debuginfo
kselftests-kmp-64kb
dtb-nvidia
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel
kernel-default-optional-debuginfo
kernel-kvmsmall-debuginfo
kernel-macros
kernel-source-vanilla
kernel-docs-html
kernel-default-base-rebuild
kernel-rt-devel
kselftests-kmp-rt
kernel-rt-vdso-debuginfo
kernel-rt_debug-vdso
kernel-rt-livepatch
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-vdso-debuginfo
kernel-rt-extra-debuginfo
gfs2-kmp-rt
kernel-syms-rt
kernel-rt-devel-debuginfo
dlm-kmp-rt-debuginfo
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kernel-rt-optional-debuginfo
kernel-rt_debug
kernel-rt_debug-devel-debuginfo
kernel-rt-livepatch-devel
kernel-rt-vdso
reiserfs-kmp-rt
kernel-devel-rt
ocfs2-kmp-rt-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt_debug-debugsource
kernel-rt_debug-devel
cluster-md-kmp-rt-debuginfo
cluster-md-kmp-rt
kselftests-kmp-rt-debuginfo
dlm-kmp-rt
kernel-rt-optional
kernel-rt_debug-debuginfo
kernel-kvmsmall-vdso-debuginfo
kernel-default-vdso
kernel-kvmsmall-vdso
kernel-default-vdso-debuginfo
linux-xilinx-zynqmp (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
kernel-livepatch-5_14_21-150400_24_205-default
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kernel-livepatch-5_14_21-150400_24_205-default-debuginfo
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kernel-livepatch-6_4_0-150700_53_40-default
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kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel-debuginfo
kernel-debug-vdso-debuginfo
kernel-debug-vdso
linux-hwe-6.8 (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-hwe-6.17 (Ubuntu package)
linux-azure-fde-6.17 (Ubuntu package)
linux-azure-6.17 (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)
linux-oem-6.17 (Ubuntu package)
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kernel-livepatch-SLE15-SP4_Update_41-debugsource
kernel-livepatch-5_14_21-150400_24_167-default-debuginfo
kernel-livepatch-5_14_21-150500_55_110-default-debuginfo
kernel-livepatch-SLE15-SP5_Update_27-debugsource
kernel-livepatch-5_14_21-150500_55_110-default

https://github.com/MrForkBomb/CIFSwitch-Checker---CVE-2026-46243-

The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.

The vulnerability exists due to improper input validation in the cifs.spnego key description handling in fs/smb/client/cifs_spnego.c when processing userspace-created cifs.spnego keys through request_key(2) or add_key(2). A local user can supply a crafted cifs.spnego description to disclose sensitive information, modify data, or cause a denial of service.

The issue arises because authority-bearing fields such as pid, uid, creduid, and upcall_target may be treated by cifs.upcall as kernel-originating inputs.

Install security update from vendor's repository.