Out-of-bounds read in Linux kernel - CVE-2026-31682

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Main Vulnerability Database Vulnerabilities #VU127875

Out-of-bounds read in Linux kernel - CVE-2026-31682

Published: April 25, 2026


Vulnerability identifier: #VU127875
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-2026-31682
CWE-ID: CWE-125
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 an out-of-bounds read in br_nd_send when parsing neighbor discovery options from a non-linear skb. A remote attacker can send a specially crafted ICMPv6 neighbor solicitation request to cause a denial of service.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
SUSE Linux Enterprise Live Patching
Ubuntu
openEuler
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-SLE15-SP7_Update_15-debugsource
kernel-livepatch-6_4_0-150700_53_55-default-debuginfo
linux (Ubuntu package)
linux-aws (Ubuntu package)
kernel-tools
kernel
kernel-source
kernel-devel
kernel-tools-debuginfo
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
python3-perf-debuginfo
linux-ibm (Ubuntu package)
linux-raspi (Ubuntu package)
linux-kvm (Ubuntu package)
kernel-headers
linux-xilinx-zynqmp (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux (Debian package)
gfs2-kmp-rt
dlm-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-rt-devel
dlm-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-debuginfo
kernel-rt
kernel-source-rt
cluster-md-kmp-rt-debuginfo
kernel-devel-rt
kernel-rt-debugsource
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
ocfs2-kmp-rt
kernel-syms-rt
kernel-default-devel
kernel-default-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debugsource
kernel-64kb-devel-debuginfo
kernel-64kb
kernel-default
ocfs2-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default
gfs2-kmp-default-debuginfo
gfs2-kmp-default
kernel-default-debugsource
dlm-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-64kb-debuginfo
kernel-default-debuginfo
cluster-md-kmp-default
kernel-macros
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-default-extra
kernel-default-extra-debuginfo
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-obs-build-debugsource
kernel-obs-build
kernel-syms
kernel-docs
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-default-base
kernel-extra-modules
linux-hwe-6.8 (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-hwe-6.17 (Ubuntu package)
linux-azure-fde-6.17 (Ubuntu package)
linux-azure-6.17 (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)
linux-oem-6.17 (Ubuntu package)

How to mitigate CVE-2026-31682

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
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-SLE15-SP7_Update_15-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_55-default-debuginfo - update to 1-150700.15.3.1
linux (Ubuntu package) - addressed in versions 4.15.0.253.237, 4.15.0-253.265, 4.15.0.1149.146, 4.15.0-1149.161, 4.15.0.1156.161, 4.15.0-1156.167, 4.15.0.1176.167, 4.15.0-1176.181, 4.15.0.1187.200~16.04.1, 4.15.0-1187.204, 4.15.0.1204.172, 4.15.0-1204.219, 4.15.0.2095.93, 4.15.0-2095.101, 4.15.0.2112.108, 4.15.0-2112.118, 5.4.0.233.225, 5.4.0-233.253, 5.4.0-233.253~18.04.1, 5.4.0-1065.68, 5.4.0.1079.79, 5.4.0-1079.83, 5.4.0.1120.116, 5.4.0-1120.127, 5.4.0.1135.132, 5.4.0-1135.145, 5.4.0.1159.153, 5.4.0-1159.169+fips1, 5.4.0-1159.169~18.04.1, 5.4.0.1161.108, 5.4.0.1161.159, 5.4.0-1161.172, 5.4.0-1161.172+fips1, 5.4.0-1161.172~18.04.1, 5.4.0.1164.106, 5.4.0.1164.166, 5.4.0-1164.173, 5.4.0-1164.173+fips1, 5.4.0-1164.173~18.04.1, 5.4.0.1166.102, 5.4.0.1166.158, 5.4.0-1166.172, 5.4.0-1166.172+fips1, 5.4.0-1166.172~18.04.1, 5.15.0.183.154, 5.15.0-183.193, 5.15.0-183.193~20.04.1, 5.15.0.185.108, 5.15.0.185.166, 5.15.0-185.195+fips1, 5.15.0-185.195~20.04.1, 5.15.0-1052.52, 5.15.0.1052.54, 5.15.0-1063.63, 5.15.0-1063.63~20.04.1, 5.15.0.1094.93, 5.15.0-1094.102, 5.15.0.1103.99, 5.15.0-1103.105, 5.15.0.1103.107, 5.15.0-1103.108, 5.15.0.1105.102, 5.15.0.1105.109, 5.15.0-1105.109~20.04.1, 5.15.0.1106.105, 5.15.0.1106.106, 5.15.0-1106.107, 5.15.0-1106.112, 5.15.0.1107.106, 5.15.0-1107.113, 5.15.0.1108.104, 5.15.0-1108.114, 5.15.0.1110.114, 5.15.0-1110.119, 5.15.0.1111.101, 5.15.0.1111.107, 5.15.0.1111.108, 5.15.0.1111.114, 5.15.0-1111.118, 5.15.0-1111.118+fips1, 5.15.0-1111.118~20.04.1, 5.15.0-1111.121, 5.15.0-1111.121+fips1, 5.15.0.1116.114, 5.15.0-1116.125, 5.15.0-1116.125~20.04.1, 6.8.0-134.134, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61+fips1, 6.8.0-1058.61~22.04.1, 6.8.0-1060.61, 6.8.0-1060.63+fips1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69, 6.8.0-1063.69+fips1, 6.8.1-1055.56, 6.8.1-1055.56~22.04.1, 6.17.0-40.40
linux-aws (Ubuntu package) - addressed in versions 4.15.0.1194.192, 4.15.0-1194.207, 4.15.0.2132.126, 4.15.0-2132.138
kernel-tools - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-source - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-devel - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-tools-debuginfo - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-debugsource - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-debuginfo - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
bpftool-debuginfo - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
bpftool - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-tools-devel - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
perf - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
perf-debuginfo - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
python2-perf - update to 4.19.90-2605.3.0.0372
python2-perf-debuginfo - update to 4.19.90-2605.3.0.0372
python3-perf - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
python3-perf-debuginfo - addressed in versions 4.19.90-2605.3.0.0372, 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
linux-ibm (Ubuntu package) - addressed in versions 5.4.0-1107.112, 5.4.0-1107.112~18.04.1, 5.4.0.1107.136
linux-raspi (Ubuntu package) - addressed in versions 5.4.0-1144.157, 5.4.0-1144.157~18.04.1, 5.4.0.1144.175, 5.15.0.1105.103, 5.15.0-1105.108, 6.8.0-1060.64, 6.17.0-1021.21
linux-kvm (Ubuntu package) - addressed in versions 5.4.0.1148.144, 5.4.0-1148.157
kernel-headers - addressed in versions 5.10.0-314.0.0.217, 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
linux-xilinx-zynqmp (Ubuntu package) - addressed in versions 5.15.0.1074.77, 5.15.0-1074.78
linux-gcp-5.15 (Ubuntu package) - addressed in versions 5.15.0-1106.112~20.04.1, 5.15.0-1111.121~20.04.1
linux-oracle-5.15 (Ubuntu package) - update to 5.15.0-1108.114~20.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1116.101, 5.15.0-1116.125+fips1, 6.8.0-134.134+fips1, 6.8.0-1062.69+fips1
linux (Debian package) - addressed in versions 6.1.170-1, 6.12.85-1
gfs2-kmp-rt - update to 6.4.0-150700.7.54.1
dlm-kmp-rt - update to 6.4.0-150700.7.54.1
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 - update to 6.4.0-150700.7.54.1
kernel-source-rt - update to 6.4.0-150700.7.54.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.54.1
kernel-devel-rt - update to 6.4.0-150700.7.54.1
kernel-rt-debugsource - 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 - update to 6.4.0-150700.7.54.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.54.1
kernel-syms-rt - update to 6.4.0-150700.7.54.1
kernel-default-devel - update to 6.4.0-150700.53.55.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.55.1
kernel-64kb-devel - update to 6.4.0-150700.53.55.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.55.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.55.1
kernel-64kb - update to 6.4.0-150700.53.55.1
kernel-default - update to 6.4.0-150700.53.55.1
ocfs2-kmp-default - update to 6.4.0-150700.53.55.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.55.1
dlm-kmp-default - update to 6.4.0-150700.53.55.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.55.1
gfs2-kmp-default - update to 6.4.0-150700.53.55.1
kernel-default-debugsource - update to 6.4.0-150700.53.55.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.55.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.55.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.55.1
kernel-default-debuginfo - update to 6.4.0-150700.53.55.1
cluster-md-kmp-default - update to 6.4.0-150700.53.55.1
kernel-macros - update to 6.4.0-150700.53.55.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.55.1
kernel-default-livepatch - update to 6.4.0-150700.53.55.1
kernel-default-extra - update to 6.4.0-150700.53.55.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-devel - update to 6.4.0-150700.53.55.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-debugsource - update to 6.4.0-150700.53.55.1
kernel-azure - update to 6.4.0-150700.53.55.1
reiserfs-kmp-default - update to 6.4.0-150700.53.55.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.55.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.55.1
kernel-obs-build - update to 6.4.0-150700.53.55.1
kernel-syms - update to 6.4.0-150700.53.55.1
kernel-docs - update to 6.4.0-150700.53.55.1
kernel-source - update to 6.4.0-150700.53.55.1
kernel-devel - update to 6.4.0-150700.53.55.1
kernel-zfcpdump - update to 6.4.0-150700.53.55.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.55.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.55.1
kernel-default-base - update to 6.4.0-150700.53.55.1.150700.17.33.1
kernel-extra-modules - update to 6.6.0-145.0.10.141
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1029.30
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1045.48, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61.1, 6.8.0-1058.64, 6.8.0-1060.61~22.04.1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69~22.04.1
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-raspi-realtime (Ubuntu package) - update to 6.8.0-2049.50
linux-hwe-6.17 (Ubuntu package) - update to 6.17.0-40.40~24.04.1
linux-azure-fde-6.17 (Ubuntu package) - update to 6.17.0-1018.18~24.04.1
linux-azure-6.17 (Ubuntu package) - update to 6.17.0-1021.21~24.04.1
linux-nvidia-6.17 (Ubuntu package) - update to 6.17.0-1026.26
linux-oem-6.17 (Ubuntu package) - update to 6.17.0-1028.28

External References

Related Security Bulletins