ID:12865 - 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 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing 15
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 11
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Anolis OS
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
Red Hat Enterprise Linux for ARM 64 - 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 IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for ARM 64
SUSE Linux Enterprise Live Patching
openSUSE Leap
openEuler
Ubuntu
kernel-livepatch-5_14_21-150400_24_222-default
kernel-livepatch-SLE15-SP4_Update_55-debugsource
kernel-livepatch-5_14_21-150400_24_222-default-debuginfo
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-debuginfo
kernel-livepatch-6_4_0-150600_23_115-default
kernel (Red Hat package)
kernel-trace-devel
kernel-xen-base
kernel-syms
kernel-default-debuginfo
kernel-trace-debuginfo
kernel-default-devel
kernel-ec2-base
kernel-ec2-devel-debuginfo
kernel-xen-debugsource
kernel-trace-debugsource
kernel-trace-devel-debuginfo
kernel-xen-devel
kernel-source
kernel-ec2-debuginfo
kernel-xen-devel-debuginfo
kernel-ec2-devel
kernel-default-debugsource
kernel-default
kernel-ec2
kernel-trace
kernel-xen
kernel-trace-base
kernel-ec2-debugsource
kernel-xen-debuginfo
kernel-docs
kernel-default-base
kernel-default-devel-debuginfo
kernel-rt (Red Hat package)
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
kernel-cross-headers
perf
kernel-core
kernel
bpftool
kernel-devel
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
python3-perf
kernel-abi-stablelists
kernel-doc
python3-perf-debuginfo
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-tools-debuginfo
kernel-tools-devel
perf-debuginfo
kernel-debug-modules-internal
kernel-modules-internal
kernel-rt
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-source-rt
ocfs2-kmp-default
dlm-kmp-default
kernel-kvmsmall-debugsource
kernel-default-optional-debuginfo
kernel-zfcpdump
kernel-docs-html
kernel-source-vanilla
kernel-macros
kernel-kvmsmall-devel
kernel-64kb-extra-debuginfo
kernel-default-extra-debuginfo
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-obs-build
kernel-default-extra
gfs2-kmp-default-debuginfo
gfs2-kmp-default
kernel-obs-build-debugsource
kernel-obs-qa
dlm-kmp-default-debuginfo
dlm-kmp-64kb
dtb-renesas
dtb-broadcom
kernel-64kb-devel
dtb-mediatek
dtb-hisilicon
kernel-64kb-optional
kernel-64kb-optional-debuginfo
dtb-qcom
dtb-amazon
dtb-exynos
dtb-lg
ocfs2-kmp-64kb-debuginfo
dtb-rockchip
dtb-altera
reiserfs-kmp-64kb
dtb-xilinx
gfs2-kmp-64kb
kernel-64kb-debuginfo
dtb-arm
cluster-md-kmp-64kb-debuginfo
dtb-allwinner
kernel-kvmsmall-devel-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
dtb-nvidia
kselftests-kmp-64kb
kernel-64kb-devel-debuginfo
kselftests-kmp-64kb-debuginfo
dtb-cavium
dtb-apple
kernel-kvmsmall-debuginfo
dlm-kmp-64kb-debuginfo
dtb-marvell
dtb-socionext
ocfs2-kmp-64kb
dtb-amlogic
kernel-64kb-debugsource
cluster-md-kmp-64kb
dtb-amd
dtb-apm
kselftests-kmp-default
dtb-freescale
reiserfs-kmp-64kb-debuginfo
dtb-sprd
kernel-64kb-extra
gfs2-kmp-64kb-debuginfo
kernel-default-livepatch-devel
kernel-kvmsmall
kernel-64kb
kernel-default-optional
kselftests-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-livepatch
cluster-md-kmp-default
dtb-aarch64
kernel-default-base-rebuild
kernel-rt_debug-vdso
kernel-rt-livepatch
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-vdso-debuginfo
kernel-rt-extra-debuginfo
kernel-rt-extra
gfs2-kmp-rt
kernel-syms-rt
kernel-rt-devel-debuginfo
dlm-kmp-rt-debuginfo
kernel-devel-rt
kernel-rt_debug
kernel-rt_debug-devel-debuginfo
kernel-rt-livepatch-devel
kernel-rt-vdso
reiserfs-kmp-rt
ocfs2-kmp-rt-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt-optional-debuginfo
kernel-rt_debug-devel
kernel-rt_debug-debugsource
kernel-rt-vdso-debuginfo
kernel-rt-devel
kselftests-kmp-rt
kernel-rt_debug-debuginfo
kernel-rt-optional
dlm-kmp-rt
kselftests-kmp-rt-debuginfo
cluster-md-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-default-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-default-vdso-debuginfo
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel-debuginfo
kernel-debug-vdso-debuginfo
kernel-debug-vdso
linux (Ubuntu package)
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-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-raspi (Ubuntu package)

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

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.