Use-after-free in Linux kernel - CVE-2026-23413

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Main Vulnerability Database Vulnerabilities #VU124857

Use-after-free in Linux kernel - CVE-2026-23413

Published: April 3, 2026


Vulnerability identifier: #VU124857
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-2026-23413
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 the clsact qdisc when handling init and destroy rollback after a replacement failure. A local attacker can trigger a replacement failure during clsact initialization to cause a denial of service.

The issue occurs because ingress may be initialized before egress initialization fails, after which destroy logic can operate on stale state from the previous clsact instance.


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
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
openSUSE Leap
Ubuntu
openEuler
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-SLE15-SP7-RT_Update_11-debugsource
kernel-livepatch-6_4_0-150700_7_37-rt
kernel-livepatch-6_4_0-150700_7_37-rt-debuginfo
kernel-livepatch-SLE15-SP7_Update_11-debugsource
kernel-livepatch-6_4_0-150700_53_37-default
kernel-livepatch-6_4_0-150700_53_37-default-debuginfo
gfs2-kmp-default-debuginfo
dtb-broadcom
reiserfs-kmp-default
kernel-default-debuginfo
kernel-syms
kernel-default
kernel-default-livepatch-devel
kernel-kvmsmall
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
dtb-aarch64
kernel-64kb-devel
dtb-nvidia
kernel-kvmsmall-debuginfo
kernel-default-optional-debuginfo
kernel-default-devel-debuginfo
kernel-default-optional
cluster-md-kmp-default-debuginfo
kernel-default-devel
gfs2-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-extra
cluster-md-kmp-default
kernel-default-livepatch
kernel-default-debugsource
ocfs2-kmp-default
kselftests-kmp-default-debuginfo
kernel-obs-build-debugsource
kernel-obs-qa
dlm-kmp-default
kselftests-kmp-default
kernel-default-extra-debuginfo
kernel-obs-build
dlm-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-64kb
dtb-renesas
ocfs2-kmp-64kb
dtb-exynos
kernel-64kb-optional-debuginfo
dlm-kmp-64kb
kernel-64kb-extra-debuginfo
dtb-allwinner
dtb-qcom
dtb-amazon
dtb-lg
dtb-freescale
kernel-64kb-extra
dlm-kmp-64kb-debuginfo
reiserfs-kmp-64kb
ocfs2-kmp-64kb-debuginfo
dtb-marvell
dtb-amlogic
cluster-md-kmp-64kb
dtb-xilinx
kernel-64kb
dtb-cavium
kernel-64kb-optional
dtb-socionext
dtb-hisilicon
kernel-64kb-debuginfo
kselftests-kmp-64kb
dtb-arm
reiserfs-kmp-64kb-debuginfo
dtb-amd
dtb-apm
kernel-64kb-devel-debuginfo
kselftests-kmp-64kb-debuginfo
kernel-64kb-debugsource
gfs2-kmp-64kb-debuginfo
dtb-rockchip
dtb-altera
dtb-sprd
dtb-apple
cluster-md-kmp-64kb-debuginfo
dtb-mediatek
kernel-kvmsmall-devel
kernel-docs
kernel-docs-html
kernel-source
kernel-macros
kernel-source-vanilla
kernel-devel
kernel-debug
kernel-debug-devel
kernel-debug-debuginfo
kernel-debug-devel-debuginfo
kernel-debug-debugsource
kernel-default-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-default-vdso-debuginfo
kernel-debug-vdso
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-default-base
kernel-default-base-rebuild
kernel-syms-rt
kernel-source-rt
dlm-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt
cluster-md-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-devel
ocfs2-kmp-rt
kernel-rt-debugsource
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
gfs2-kmp-rt
kernel-rt-debuginfo
gfs2-kmp-rt-debuginfo
kernel-devel-rt
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-azure
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-extra-modules
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-2026-23413

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-SLE15-SP7-RT_Update_11-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_37-rt - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_37-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7_Update_11-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_37-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_37-default-debuginfo - update to 1-150700.15.3.1
gfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
dtb-broadcom - update to 6.4.0-150600.23.95.1
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-syms - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-kvmsmall - update to 6.4.0-150600.23.95.1
kernel-zfcpdump - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-zfcpdump-debugsource - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-zfcpdump-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
dtb-aarch64 - update to 6.4.0-150600.23.95.1
kernel-64kb-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
dtb-nvidia - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.95.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.95.1
kernel-default-devel-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-optional - update to 6.4.0-150600.23.95.1
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
reiserfs-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-livepatch - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-debugsource - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
ocfs2-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.95.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-obs-qa - update to 6.4.0-150600.23.95.1
dlm-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kselftests-kmp-default - update to 6.4.0-150600.23.95.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-obs-build - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
dlm-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.95.1
dtb-renesas - update to 6.4.0-150600.23.95.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.95.1
dtb-exynos - update to 6.4.0-150600.23.95.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.95.1
dlm-kmp-64kb - update to 6.4.0-150600.23.95.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.95.1
dtb-allwinner - update to 6.4.0-150600.23.95.1
dtb-qcom - update to 6.4.0-150600.23.95.1
dtb-amazon - update to 6.4.0-150600.23.95.1
dtb-lg - update to 6.4.0-150600.23.95.1
dtb-freescale - update to 6.4.0-150600.23.95.1
kernel-64kb-extra - update to 6.4.0-150600.23.95.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.95.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
dtb-marvell - update to 6.4.0-150600.23.95.1
dtb-amlogic - update to 6.4.0-150600.23.95.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.95.1
dtb-xilinx - update to 6.4.0-150600.23.95.1
kernel-64kb - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
dtb-cavium - update to 6.4.0-150600.23.95.1
kernel-64kb-optional - update to 6.4.0-150600.23.95.1
dtb-socionext - update to 6.4.0-150600.23.95.1
dtb-hisilicon - update to 6.4.0-150600.23.95.1
kernel-64kb-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.95.1
dtb-arm - update to 6.4.0-150600.23.95.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
dtb-amd - update to 6.4.0-150600.23.95.1
dtb-apm - update to 6.4.0-150600.23.95.1
kernel-64kb-devel-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kselftests-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, 6.4.0-150700.53.37.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
dtb-rockchip - update to 6.4.0-150600.23.95.1
dtb-altera - update to 6.4.0-150600.23.95.1
dtb-sprd - update to 6.4.0-150600.23.95.1
dtb-apple - update to 6.4.0-150600.23.95.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.95.1
dtb-mediatek - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.95.1
kernel-docs - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-docs-html - update to 6.4.0-150600.23.95.1
kernel-source - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-macros - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-source-vanilla - update to 6.4.0-150600.23.95.1
kernel-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-debug - update to 6.4.0-150600.23.95.1
kernel-debug-devel - update to 6.4.0-150600.23.95.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.95.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.95.1
kernel-debug-debugsource - update to 6.4.0-150600.23.95.1
kernel-default-vdso - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.95.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.95.1
kernel-debug-vdso - update to 6.4.0-150600.23.95.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.95.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.95.1
kernel-default-base - addressed in versions 6.4.0-150600.23.95.1.150600.12.44.1, 6.4.0-150700.53.37.1.150700.17.25.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.95.1.150600.12.44.1
kernel-syms-rt - update to 6.4.0-150700.7.37.1
kernel-source-rt - update to 6.4.0-150700.7.37.2
dlm-kmp-rt - update to 6.4.0-150700.7.37.2
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt - update to 6.4.0-150700.7.37.2
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt-devel - update to 6.4.0-150700.7.37.2
ocfs2-kmp-rt - update to 6.4.0-150700.7.37.2
kernel-rt-debugsource - update to 6.4.0-150700.7.37.2
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
cluster-md-kmp-rt - update to 6.4.0-150700.7.37.2
gfs2-kmp-rt - update to 6.4.0-150700.7.37.2
kernel-rt-debuginfo - update to 6.4.0-150700.7.37.2
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-devel-rt - update to 6.4.0-150700.7.37.2
kernel-azure-devel - update to 6.4.0-150700.53.37.1
kernel-azure-debugsource - update to 6.4.0-150700.53.37.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.37.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.37.1
kernel-azure - update to 6.4.0-150700.53.37.1
kernel - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
bpftool - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
bpftool-debuginfo - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-debuginfo - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-debugsource - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-devel - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-headers - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-source - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-tools - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-tools-debuginfo - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-tools-devel - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
perf - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
perf-debuginfo - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
python3-perf - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
python3-perf-debuginfo - addressed in versions 6.6.0-145.0.2.130, 6.6.0-145.0.2.142, 6.6.0-145.0.2.143
kernel-extra-modules - update to 6.6.0-145.0.2.143
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

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