Out-of-bounds write in Linux kernel - CVE-2026-43125

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Main Vulnerability Database Vulnerabilities #VU130614

Out-of-bounds write in Linux kernel - CVE-2026-43125

Published: May 7, 2026


Vulnerability identifier: #VU130614
CSH Severity: Medium
CVSS v4 BT: 6.6 [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/E:U/U:Green]
CVE-ID: CVE-2026-43125
CWE-ID: CWE-787
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 write in dlm_search_rsb_tree() when processing network messages with an excessive resource name length. A remote attacker can send a specially crafted network message to cause a denial of service.

The length value originates from the len parameter in dlm_dump_rsb_name().


Affected software

Linux kernel
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Anolis OS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
openEuler
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel
bpftool
kernel-doc
kernel-abi-stablelists
python3-perf
perf
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-modules
kernel-core
kernel-cross-headers
kernel-debug
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-devel
kernel-headers
kernel-modules-extra
python3-perf-debuginfo
perf-debuginfo
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel-extra-modules
linux (Ubuntu package)
linux-hwe-6.17 (Ubuntu package)
linux-azure-fde-6.17 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-6.17 (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)
linux-oem-6.17 (Ubuntu package)

How to mitigate CVE-2026-43125

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel (Red Hat package) - addressed in versions 3.10.0-1160.154.1.el7, 4.18.0-372.198.1.el8_6, 4.18.0-477.150.1.el8_8, 5.14.0-284.178.1.el9_2, 5.14.0-427.136.1.el9_4, 5.14.0-687.15.1.el9_8
kernel-rt (Red Hat package) - addressed in versions 3.10.0-1160.155.1.rt56.1307.el7, 4.18.0-553.132.1.rt7.473.el8_10, 5.14.0-284.178.1.rt14.463.el9_2
kernel - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
bpftool - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-doc - update to 4.18.0-553.132.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.132.1.0.1
python3-perf - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
perf - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-tools-libs-devel - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-tools-libs - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-tools - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-modules - update to 4.18.0-553.132.1.0.1
kernel-core - update to 4.18.0-553.132.1.0.1
kernel-cross-headers - update to 4.18.0-553.132.1.0.1
kernel-debug - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-debug-core - update to 4.18.0-553.132.1.0.1
kernel-debug-devel - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-debug-modules - update to 4.18.0-553.132.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.132.1.0.1
kernel-devel - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-headers - addressed in versions 4.18.0-553.132.1.0.1, 6.6.102-6
kernel-modules-extra - update to 4.18.0-553.132.1.0.1
kernel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
python3-perf-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
python3-perf - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
perf-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
perf - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-tools-devel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-tools-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-tools - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-source - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-headers - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-devel - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-debugsource - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
bpftool-debuginfo - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
bpftool - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.19.156, 6.6.0-145.3.17.150
kernel-extra-modules - update to 6.6.0-145.3.17.150
linux (Ubuntu package) - update to 6.17.0-40.40
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-raspi (Ubuntu package) - update to 6.17.0-1021.21
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