Out-of-bounds read in Linux kernel - CVE-2026-43071

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Main Vulnerability Database Vulnerabilities #VU130221

Out-of-bounds read in Linux kernel - CVE-2026-43071

Published: May 6, 2026


Vulnerability identifier: #VU130221
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-2026-43071
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to an out-of-bounds read in dentry_hashtable when processing lookups with dhash_entries set to 1. A local user can trigger filesystem lookup operations to cause a denial of service.

The issue occurs because a single hash bucket can cause an invalid shift calculation that leads to access of unallocated memory.


Affected software

Linux kernel
Ubuntu
openEuler
linux (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-kvm (Ubuntu package)
linux-oracle-5.4 (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-azure-5.4 (Ubuntu package)
kernel
bpftool-debuginfo
python3-perf
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-headers
kernel-devel
kernel-tools-devel
perf
kernel-debugsource
perf-debuginfo
kernel-debuginfo
python3-perf-debuginfo
bpftool
linux-xilinx-zynqmp (Ubuntu package)
linux-raspi (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
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-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)
linux-nvidia (Ubuntu package)

How to mitigate CVE-2026-43071

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 4.4.0.287.293, 4.4.0-287.321, 4.4.0-287.321~14.04.1, 4.4.0.1128.130, 4.4.0-1128.135, 4.4.0.1158.155, 4.4.0-1158.164, 4.4.0.1159.156, 4.4.0-1159.170, 4.15.0.257.241, 4.15.0-257.269, 4.15.0-257.269~16.04.1, 4.15.0.1151.148, 4.15.0-1151.163, 4.15.0.1178.169, 4.15.0-1178.183, 4.15.0.1196.194, 4.15.0-1196.209, 4.15.0-1196.209~16.04.1, 4.15.0.2134.128, 4.15.0-2134.140, 5.4.0.234.226, 5.4.0-234.254, 5.4.0-234.254~18.04.1, 5.4.0-1066.69, 5.4.0.1080.80, 5.4.0-1080.84, 5.4.0-1108.113, 5.4.0-1108.113~18.04.1, 5.4.0.1108.137, 5.4.0.1121.117, 5.4.0-1121.128, 5.4.0.1136.133, 5.4.0-1136.146, 5.4.0-1145.158, 5.4.0-1145.158~18.04.1, 5.4.0.1145.176, 5.4.0.1160.154, 5.4.0-1160.170+fips1, 5.4.0.1162.160, 5.4.0-1162.173, 5.4.0-1162.173~18.04.1, 5.4.0.1165.167, 5.4.0-1165.174, 5.4.0-1165.174~18.04.1, 5.4.0.1167.159, 5.4.0-1167.173, 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, 7.0.0-27.27
linux-oracle (Ubuntu package) - addressed in versions 4.15.0.1158.163, 4.15.0-1158.169, 4.15.0-1158.169~16.04.1
linux-gcp (Ubuntu package) - addressed in versions 4.15.0.1189.202, 4.15.0-1189.206, 4.15.0-1189.206~16.04.1, 4.15.0.2097.95, 4.15.0-2097.103
linux-azure (Ubuntu package) - addressed in versions 4.15.0.1206.174, 4.15.0-1206.221, 4.15.0-1206.221~14.04.1, 4.15.0-1206.221~16.04.1, 4.15.0.2114.110, 4.15.0-2114.120, 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-kvm (Ubuntu package) - addressed in versions 5.4.0.1149.145, 5.4.0-1149.158
linux-oracle-5.4 (Ubuntu package) - update to 5.4.0-1161.171~18.04.1
linux-gcp-fips (Ubuntu package) - addressed in versions 5.4.0.1165.107, 5.4.0-1165.174+fips1
linux-azure-5.4 (Ubuntu package) - addressed in versions 5.4.0.1167.103, 5.4.0-1167.173+fips1, 5.4.0-1167.173~18.04.1
kernel - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
bpftool-debuginfo - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
python3-perf - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
kernel-source - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
kernel-tools - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
kernel-tools-debuginfo - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
kernel-headers - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
kernel-devel - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
kernel-tools-devel - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
perf - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
kernel-debugsource - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
perf-debuginfo - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
kernel-debuginfo - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
python3-perf-debuginfo - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
bpftool - addressed in versions 5.10.0-320.0.0.222, 6.6.0-145.1.15.153
linux-xilinx-zynqmp (Ubuntu package) - addressed in versions 5.15.0.1074.77, 5.15.0-1074.78
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1105.103, 5.15.0-1105.108, 6.8.0-1060.64, 6.17.0-1021.21, 7.0.0-1014.14
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-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-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
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13

External References

Related Security Bulletins