ID:12961 - Exploit for Use-after-free in Linux kernel - CVE-2026-43499

Vulnerability identifier: #VU132122

Vulnerability risk: Low

CVE-ID: CVE-2026-43499

CWE-ID: CWE-416

Exploitation vector: Local access

Vulnerable software:
Linux kernel
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 11
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Anolis OS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64
Ubuntu
SUSE Linux Enterprise Live Patching
openSUSE Leap
openEuler
kernel-livepatch-5_14_21-150400_24_222-default
kernel-livepatch-5_14_21-150400_24_222-default-debuginfo
kernel-livepatch-SLE15-SP4_Update_55-debugsource
kernel-livepatch-5_14_21-150500_55_169-default-debuginfo
kernel-livepatch-5_14_21-150500_55_169-default
kernel-livepatch-SLE15-SP5_Update_41-debugsource
kernel-livepatch-SLE15-SP6_Update_27-debugsource
kernel-livepatch-6_4_0-150600_23_115-default
kernel-livepatch-6_4_0-150600_23_115-default-debuginfo
kernel (Red Hat package)
kernel-trace-debuginfo
kernel-trace-debugsource
kernel-trace-devel
kernel-default-debuginfo
kernel-syms
kernel-xen-base
kernel-xen-debuginfo
kernel-default-devel-debuginfo
kernel-ec2-debugsource
kernel-trace-base
kernel-xen
kernel-trace
kernel-ec2
kernel-default-devel
kernel-ec2-base
kernel-ec2-devel-debuginfo
kernel-xen-debugsource
kernel-trace-devel-debuginfo
kernel-xen-devel
kernel-source
kernel-ec2-debuginfo
kernel-xen-devel-debuginfo
kernel-default-debugsource
kernel-ec2-devel
kernel-default-base
kernel-docs
kernel-default
kernel-rt (Red Hat package)
linux (Ubuntu package)
linux-aws-hwe (Ubuntu package)
linux-oracle (Ubuntu package)
linux-azure (Ubuntu package)
bpftool
kernel-doc
kernel-abi-stablelists
python3-perf
perf
kernel-tools-libs-devel
kernel-debug
kernel-tools-libs
kernel
kernel-core
kernel-cross-headers
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-devel
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
perf-debuginfo
python3-perf-debuginfo
kernel-tools-devel
kernel-tools-debuginfo
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel-debug-modules-internal
kernel-modules-internal
kernel-source-rt
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-rt
dtb-apm
dtb-amazon
dtb-lg
dtb-renesas
dtb-broadcom
kernel-64kb-devel
dtb-mediatek
dtb-hisilicon
kernel-64kb-optional
kernel-64kb-optional-debuginfo
dtb-qcom
dtb-amd
cluster-md-kmp-64kb
kernel-64kb-debugsource
dtb-amlogic
kernel-64kb-extra-debuginfo
dtb-socionext
dtb-marvell
dlm-kmp-64kb-debuginfo
dtb-allwinner
kernel-64kb
dtb-apple
cluster-md-kmp-64kb-debuginfo
dtb-aarch64
kernel-kvmsmall
kernel-default-livepatch-devel
gfs2-kmp-64kb-debuginfo
kernel-64kb-extra
dtb-sprd
reiserfs-kmp-64kb-debuginfo
dtb-freescale
ocfs2-kmp-64kb
dtb-exynos
dtb-arm
kernel-64kb-debuginfo
gfs2-kmp-64kb
dtb-xilinx
reiserfs-kmp-64kb
dtb-altera
dtb-rockchip
ocfs2-kmp-64kb-debuginfo
dlm-kmp-64kb
kernel-obs-build-debugsource
ocfs2-kmp-default
kernel-default-extra-debuginfo
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-obs-build
kernel-default-extra
gfs2-kmp-default-debuginfo
gfs2-kmp-default
kselftests-kmp-64kb-debuginfo
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
dlm-kmp-default
dtb-cavium
kernel-64kb-devel-debuginfo
kselftests-kmp-64kb
dtb-nvidia
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel
kernel-macros
kernel-source-vanilla
kernel-docs-html
kernel-zfcpdump
kernel-default-optional-debuginfo
kernel-default-base-rebuild
ocfs2-kmp-rt
kernel-rt_debug-debuginfo
kernel-rt-optional-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-devel-debuginfo
kselftests-kmp-rt
kernel-rt-devel
kernel-rt-vdso-debuginfo
kernel-rt_debug-vdso
kernel-rt-livepatch
gfs2-kmp-rt-debuginfo
kernel-rt_debug-vdso-debuginfo
ocfs2-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
kernel-syms-rt
gfs2-kmp-rt
kernel-rt-extra
reiserfs-kmp-rt-debuginfo
kernel-rt-extra-debuginfo
kernel-devel-rt
kernel-rt_debug
kernel-rt_debug-devel-debuginfo
kernel-rt-livepatch-devel
kernel-rt-vdso
reiserfs-kmp-rt
kernel-default-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-default-vdso-debuginfo
linux-azure-5.15 (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-azure-fde-5.15 (Ubuntu package)
kernel-debug-vdso
kernel-debug-vdso-debuginfo
kernel-debug-devel-debuginfo
kernel-debug-debuginfo
kernel-debug-debugsource
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-aws (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-azure-6.17 (Ubuntu package)
linux-oracle-6.17 (Ubuntu package)

https://github.com/oopnv70-lab/ghostlock-honor-aak-probe

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

The vulnerability exists due to use-after-free in remove_waiter() when rolling back a proxy lock from futex_requeue(). A local user can trigger the affected rtmutex slowlock and proxy-lock rollback path to cause a denial of service.

The issue can leave waiter task state uncleared and operate on the wrong top priority waiter task.

Install security update from vendor's repository.