Use-after-free in Linux kernel - CVE-2026-23412

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Main Vulnerability Database Vulnerabilities #VU124856

Use-after-free in Linux kernel - CVE-2026-23412

Published: April 3, 2026


Vulnerability identifier: #VU124856
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-2026-23412
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to use-after-free in nfnl_hook_dump_one when dumping hooks via nfnetlink_hooks during concurrent access. A local attacker can trigger concurrent hook dump activity to cause a denial of service.

The issue is triggered by a race condition involving concurrent readers and may lead to a kernel crash.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
Debian Linux
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Live Patching
Basesystem Module
SUSE Real Time Module
Public Cloud Module
Legacy Module
Development Tools Module
openSUSE Leap
Ubuntu
kernel-livepatch-6_4_0-150600_23_95-default-debuginfo
kernel-livepatch-6_4_0-150600_23_95-default
kernel-livepatch-SLE15-SP6_Update_22-debugsource
kernel-livepatch-6_4_0-150700_7_54-rt
kernel-livepatch-SLE15-SP7-RT_Update_15-debugsource
kernel-livepatch-6_4_0-150700_7_54-rt-debuginfo
kernel-livepatch-6_4_0-150700_53_55-default
kernel-livepatch-6_4_0-150700_53_55-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_15-debugsource
kernel-zfcpdump-debuginfo
dtb-rockchip
gfs2-kmp-64kb-debuginfo
kernel-64kb-debugsource
dtb-altera
kselftests-kmp-64kb-debuginfo
dtb-cavium
dtb-apm
dtb-amd
reiserfs-kmp-64kb-debuginfo
dtb-arm
kselftests-kmp-64kb
kernel-64kb-debuginfo
dtb-hisilicon
dtb-socionext
kernel-64kb-optional
kernel-64kb-devel-debuginfo
dtb-broadcom
dtb-nvidia
kernel-64kb-devel
dtb-aarch64
kernel-docs-html
dtb-qcom
kernel-64kb
dtb-xilinx
cluster-md-kmp-64kb
dtb-amlogic
dtb-marvell
ocfs2-kmp-64kb-debuginfo
reiserfs-kmp-64kb
dlm-kmp-64kb-debuginfo
kernel-64kb-extra
gfs2-kmp-64kb
dtb-lg
dtb-amazon
dtb-sprd
dtb-allwinner
kernel-64kb-extra-debuginfo
dlm-kmp-64kb
kernel-64kb-optional-debuginfo
dtb-exynos
ocfs2-kmp-64kb
dtb-renesas
dtb-freescale
dtb-mediatek
cluster-md-kmp-64kb-debuginfo
dtb-apple
kernel-kvmsmall-vdso-debuginfo
gfs2-kmp-default
kernel-default-devel
cluster-md-kmp-default-debuginfo
kernel-default-optional
kernel-kvmsmall-debuginfo
kernel-kvmsmall-devel
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-vdso
kernel-debug-vdso-debuginfo
kernel-debug-vdso
kernel-default-vdso-debuginfo
kernel-zfcpdump
kernel-default-vdso
kernel-debug-debugsource
kernel-debug-devel-debuginfo
kernel-debug-debuginfo
kernel-debug-devel
kernel-docs
kernel-debug
kernel-devel
kernel-source-vanilla
kernel-source
kernel-macros
kernel-zfcpdump-debugsource
kernel-default-extra
reiserfs-kmp-default-debuginfo
kernel-default-livepatch-devel
kernel-kvmsmall
kernel-default
kernel-syms
kernel-default-debuginfo
reiserfs-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
kernel-obs-build
kernel-default-extra-debuginfo
dlm-kmp-default
kernel-obs-qa
kernel-obs-build-debugsource
kselftests-kmp-default-debuginfo
kernel-default-optional-debuginfo
cluster-md-kmp-default
kernel-default-devel-debuginfo
kernel-default-debugsource
kselftests-kmp-default
kernel-default-livepatch
kernel-default-base-rebuild
kernel-default-base
kernel-rt
kernel-source-rt
kernel-devel-rt
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
cluster-md-kmp-rt
ocfs2-kmp-rt
gfs2-kmp-rt
dlm-kmp-rt
kernel-syms-rt
ocfs2-kmp-rt-debuginfo
kernel-rt-devel
dlm-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-azure-devel
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-raspi (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 (Debian package)

How to mitigate CVE-2026-23412

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-6_4_0-150600_23_95-default-debuginfo - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150600_23_95-default - update to 1-150600.13.3.1
kernel-livepatch-SLE15-SP6_Update_22-debugsource - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150700_7_54-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_15-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_54-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_55-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_55-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_15-debugsource - update to 1-150700.15.3.1
kernel-zfcpdump-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
dtb-rockchip - update to 6.4.0-150600.23.95.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
kernel-64kb-debugsource - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
dtb-altera - update to 6.4.0-150600.23.95.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
dtb-cavium - update to 6.4.0-150600.23.95.1
dtb-apm - update to 6.4.0-150600.23.95.1
dtb-amd - update to 6.4.0-150600.23.95.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
dtb-arm - update to 6.4.0-150600.23.95.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.95.1
kernel-64kb-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
dtb-hisilicon - update to 6.4.0-150600.23.95.1
dtb-socionext - update to 6.4.0-150600.23.95.1
kernel-64kb-optional - update to 6.4.0-150600.23.95.1
kernel-64kb-devel-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
dtb-broadcom - update to 6.4.0-150600.23.95.1
dtb-nvidia - update to 6.4.0-150600.23.95.1
kernel-64kb-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
dtb-aarch64 - update to 6.4.0-150600.23.95.1
kernel-docs-html - update to 6.4.0-150600.23.95.1
dtb-qcom - update to 6.4.0-150600.23.95.1
kernel-64kb - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
dtb-xilinx - update to 6.4.0-150600.23.95.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.95.1
dtb-amlogic - update to 6.4.0-150600.23.95.1
dtb-marvell - update to 6.4.0-150600.23.95.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.95.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
kernel-64kb-extra - update to 6.4.0-150600.23.95.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.95.1
dtb-lg - update to 6.4.0-150600.23.95.1
dtb-amazon - update to 6.4.0-150600.23.95.1
dtb-sprd - update to 6.4.0-150600.23.95.1
dtb-allwinner - update to 6.4.0-150600.23.95.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.95.1
dlm-kmp-64kb - update to 6.4.0-150600.23.95.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.95.1
dtb-exynos - update to 6.4.0-150600.23.95.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.95.1
dtb-renesas - update to 6.4.0-150600.23.95.1
dtb-freescale - update to 6.4.0-150600.23.95.1
dtb-mediatek - update to 6.4.0-150600.23.95.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
dtb-apple - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.95.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-optional - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.95.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.95.1
kernel-debug-vdso - update to 6.4.0-150600.23.95.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.95.1
kernel-zfcpdump - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-vdso - update to 6.4.0-150600.23.95.1
kernel-debug-debugsource - update to 6.4.0-150600.23.95.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.95.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.95.1
kernel-debug-devel - update to 6.4.0-150600.23.95.1
kernel-docs - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-debug - update to 6.4.0-150600.23.95.1
kernel-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-source-vanilla - update to 6.4.0-150600.23.95.1
kernel-source - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-macros - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-zfcpdump-debugsource - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
reiserfs-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-kvmsmall - update to 6.4.0-150600.23.95.1
kernel-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-syms - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
gfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
ocfs2-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
dlm-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-obs-build - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
dlm-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-obs-qa - update to 6.4.0-150600.23.95.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.95.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.95.1
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-devel-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-debugsource - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kselftests-kmp-default - update to 6.4.0-150600.23.95.1
kernel-default-livepatch - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.55.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.95.1.150600.12.44.1
kernel-default-base - addressed in versions 6.4.0-150600.23.95.1.150600.12.44.1, 6.4.0-150700.53.55.1.150700.17.33.1
kernel-rt - update to 6.4.0-150700.7.54.1
kernel-source-rt - update to 6.4.0-150700.7.54.1
kernel-devel-rt - update to 6.4.0-150700.7.54.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.54.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.54.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.54.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.54.1
gfs2-kmp-rt - update to 6.4.0-150700.7.54.1
dlm-kmp-rt - update to 6.4.0-150700.7.54.1
kernel-syms-rt - update to 6.4.0-150700.7.54.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.54.1
kernel-rt-devel - update to 6.4.0-150700.7.54.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.54.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.54.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.54.1
kernel-rt-debugsource - update to 6.4.0-150700.7.54.1
kernel-azure - update to 6.4.0-150700.53.55.1
kernel-azure-debugsource - update to 6.4.0-150700.53.55.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-devel - update to 6.4.0-150700.53.55.1
linux (Ubuntu package) - addressed in versions 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-aws (Ubuntu package) - update to 6.8.0-1061.64+1
linux-raspi (Ubuntu package) - addressed in versions 6.8.0-1061.65, 6.8.0-2050.52
linux-azure-fde (Ubuntu package) - update to 6.8.0-1062.69
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1063.71, 6.8.0-1063.71~22.04.1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1063.71+fips2
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1
linux (Debian package) - update to 6.12.85-1

External References

Related Security Bulletins