NULL Pointer Dereference in Linux kernel - CVE-2026-23381

 

NULL Pointer Dereference in Linux kernel - CVE-2026-23381

Published: March 25, 2026


Vulnerability identifier: #VU124452
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-23381
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a NULL pointer dereference in the bridge component when handling packets. A remote attacker can send a specially crafted ICMPv6 Neighbor Discovery packet to trigger a kernel NULL pointer dereference.

IPv6 must be disabled via the 'ipv6.disable=1' kernel parameter for the vulnerability to be exploitable.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 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-6_4_0-150700_7_37-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_37-rt
kernel-livepatch-SLE15-SP7-RT_Update_11-debugsource
kernel-livepatch-6_4_0-150700_53_37-default-debuginfo
kernel-livepatch-6_4_0-150700_53_37-default
kernel-livepatch-SLE15-SP7_Update_11-debugsource
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux (Debian package)
dtb-sprd
kernel-64kb-debugsource
gfs2-kmp-64kb-debuginfo
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-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-kvmsmall
kernel-default-livepatch-devel
dtb-amazon
ocfs2-kmp-64kb
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-rockchip
dtb-qcom
dtb-allwinner
kernel-64kb-extra-debuginfo
dlm-kmp-64kb
kernel-64kb-optional-debuginfo
dtb-exynos
dtb-renesas
dtb-freescale
dtb-mediatek
cluster-md-kmp-64kb-debuginfo
dtb-apple
dtb-altera
kernel-debug-debugsource
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-kvmsmall-vdso-debuginfo
kernel-default-vdso
kernel-syms
kernel-debug-devel-debuginfo
kernel-debug-debuginfo
kernel-debug-devel
kernel-debug
kernel-devel
kernel-source-vanilla
kernel-macros
kernel-source
kernel-docs-html
kernel-docs
kernel-default
kernel-default-devel
cluster-md-kmp-default-debuginfo
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
kselftests-kmp-default
dlm-kmp-default
kernel-obs-qa
kernel-obs-build-debugsource
kernel-default-optional-debuginfo
gfs2-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-extra
cluster-md-kmp-default
kernel-default-livepatch
kernel-default-debugsource
kernel-default-devel-debuginfo
kselftests-kmp-default-debuginfo
kernel-default-base
kernel-default-base-rebuild
kernel-syms-rt
kernel-rt-debuginfo
gfs2-kmp-rt
kernel-source-rt
cluster-md-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-rt-debugsource
ocfs2-kmp-rt
kernel-rt-devel
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
kernel-devel-rt
kernel-rt
dlm-kmp-rt
kernel-rt-devel-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-debuginfo
kernel-azure
kernel-azure-devel-debuginfo
kernel-tools-debuginfo
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-headers
kernel-tools
kernel-tools-devel
perf
python3-perf
python3-perf-debuginfo
perf-debuginfo
kernel-extra-modules
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-raspi (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-gcp-fips (Ubuntu package)

How to mitigate CVE-2026-23381

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_37-rt-debuginfo - 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-SLE15-SP7-RT_Update_11-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_37-default-debuginfo - 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-SLE15-SP7_Update_11-debugsource - update to 1-150700.15.3.1
linux (Ubuntu package) - addressed in versions 5.15.0.184.155, 5.15.0-184.194, 5.15.0-184.194~20.04.1, 5.15.0.186.166, 5.15.0-186.196, 5.15.0-186.196~20.04.1, 5.15.0.1075.78, 5.15.0-1075.79, 5.15.0.1095.94, 5.15.0-1095.103, 5.15.0.1104.100, 5.15.0-1104.109, 5.15.0.1108.107, 5.15.0-1108.114, 5.15.0.1111.115, 5.15.0-1111.120+fips1, 5.15.0.1112.102, 5.15.0.1112.109, 5.15.0-1112.122, 5.15.0-1112.122+fips1, 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-aws (Ubuntu package) - addressed in versions 5.15.0.186.109, 5.15.0-186.196+fips1, 5.15.0.1106.103, 5.15.0-1106.110, 5.15.0.1107.107, 5.15.0-1107.108, 5.15.0.1112.108, 5.15.0.1112.115, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0-1112.119~20.04.1, 6.8.0-1061.64+1
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0.1053.55, 5.15.0.1064.64, 5.15.0-1064.66
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1104.106, 5.15.0.1104.108, 5.15.0-1107.113~20.04.1
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1106.110~20.04.1
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1107.106, 5.15.0-1107.113
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.105, 5.15.0-1109.115, 5.15.0.1117.115, 5.15.0-1117.126, 6.8.0-1063.71, 6.8.0-1063.71~22.04.1
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1109.115~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1112.122~20.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1117.102, 5.15.0-1117.126+fips1, 6.8.0-1063.71+fips2
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1117.126, 6.8.0-1062.69
linux (Debian package) - addressed in versions 6.1.170-1, 6.12.85-1
dtb-sprd - 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
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, 6.4.0-150700.53.37.1
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, 6.4.0-150700.53.37.1
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, 6.4.0-150700.53.37.1
dtb-aarch64 - update to 6.4.0-150600.23.95.1
kernel-zfcpdump-debuginfo - 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 - 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-default-livepatch-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
dtb-amazon - update to 6.4.0-150600.23.95.1
ocfs2-kmp-64kb - 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-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-rockchip - update to 6.4.0-150600.23.95.1
dtb-qcom - 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
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
dtb-altera - update to 6.4.0-150600.23.95.1
kernel-debug-debugsource - update to 6.4.0-150600.23.95.1
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-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.95.1
kernel-default-vdso - update to 6.4.0-150600.23.95.1
kernel-syms - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
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-debug - update to 6.4.0-150600.23.95.1
kernel-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-source-vanilla - update to 6.4.0-150600.23.95.1
kernel-macros - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-source - 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-docs - 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-devel - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-debuginfo - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
gfs2-kmp-default-debuginfo - 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
ocfs2-kmp-default-debuginfo - 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
kernel-obs-build - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-extra-debuginfo - 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
dlm-kmp-default - 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
kernel-obs-build-debugsource - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.95.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.95.1, 6.4.0-150700.53.37.1
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
kernel-default-devel-debuginfo - 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-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-rt-debuginfo - update to 6.4.0-150700.7.37.2
gfs2-kmp-rt - update to 6.4.0-150700.7.37.2
kernel-source-rt - update to 6.4.0-150700.7.37.2
cluster-md-kmp-rt - update to 6.4.0-150700.7.37.2
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
kernel-rt-debugsource - update to 6.4.0-150700.7.37.2
ocfs2-kmp-rt - update to 6.4.0-150700.7.37.2
kernel-rt-devel - update to 6.4.0-150700.7.37.2
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.37.2
dlm-kmp-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-rt - update to 6.4.0-150700.7.37.2
dlm-kmp-rt - update to 6.4.0-150700.7.37.2
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.37.2
kernel-azure-debugsource - update to 6.4.0-150700.53.37.1
kernel-azure-devel - update to 6.4.0-150700.53.37.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.37.1
kernel-azure - update to 6.4.0-150700.53.37.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.37.1
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 - 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-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
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
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-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-raspi (Ubuntu package) - addressed in versions 6.8.0-1061.65, 6.8.0-2050.52
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1

External References

Related Security Bulletins