Vulnerability · Published May 6, 2026 · Assigned by Linux

CVE-2026-43125dlm: validate length in dlm_search_rsb_tree

Critical 9.8

In plain English

A critical-severity out-of-bounds write in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 54.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: dlm: validate length in dlm_search_rsb_tree The len parameter in dlm_dump_rsb_name() is not validated and comes from network messages. When it exceeds DLM_RESNAME_MAXLEN, it can cause out-of-bounds write in dlm_search_rsb_tree(). Add length validation to prevent potential buffer overflow.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:8kernel4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-debug5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-debug-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-abi-stablelists4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-abi-stablelists5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-core4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-cross-headers4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-cross-headers5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-debug4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-debug5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-debug-core4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-debug-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-debug-devel4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-debug-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-debug-modules4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-debug-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-debug-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-devel4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-devel-matched5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-doc4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-doc5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-headers4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-headers5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-modules4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-modules-extra4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-core4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-debug4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-debug5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-debug-core4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-debug-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-devel4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-modules4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-rt-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.132.1.rt7.473.el8_10ALSA-2026:25120
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-tools4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-tools5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-tools-libs4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-tools-libs5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-uki-virt5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-zfcpdump4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-zfcpdump5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9libperf5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8perf4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9perf5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:8python3-perf4.18.0-553.132.1.el8_10ALSA-2026:25121
AlmaLinux:9python3-perf5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9rtla5.14.0-687.15.1.el9_8ALSA-2026:25217
AlmaLinux:9rv5.14.0-687.15.1.el9_8ALSA-2026:25217
Debian:12linuxno fix listedDEBIAN-CVE-2026-43125
Debian:13linux6.12.85-1DEBIAN-CVE-2026-43125
Debian:14linux6.19.6-1DEBIAN-CVE-2026-43125
Rocky Linux:8kernel0:4.18.0-553.132.1.el8_10.cloud.0.1RXSA-2026:25121
Rocky Linux:8kernel0:4.18.0-553.132.1.el8_10RLSA-2026:25121
Rocky Linux:9kernel0:5.14.0-687.15.1.el9_7.cloud.1.0RXSA-2026:25217
Rocky Linux:9kernel0:5.14.0-687.15.1.el9_8RLSA-2026:25217
Rocky Linux:8kernel-rt0:4.18.0-553.132.1.rt7.473.el8_10RLSA-2026:25120
Ubuntu:25.10linux6.17.0-40.40UBUNTU-CVE-2026-43125
Ubuntu:25.10linux6.17.0-40.40USN-8490-1
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:25.10linux-aws6.17.0-1019.19USN-8490-1
Ubuntu:25.10linux-aws6.17.0-1019.19UBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-aws-6.176.17.0-1019.19~24.04.1UBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-aws-6.176.17.0-1019.19~24.04.1USN-8490-1
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1021.21~24.04.1UBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:25.10linux-gcp6.17.0-1020.22UBUNTU-CVE-2026-43125
Ubuntu:25.10linux-gcp6.17.0-1020.22USN-8490-1
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1020.22~24.04.1USN-8490-1
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1020.22~24.04.1UBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-hwe-6.176.17.0-40.40~24.04.1USN-8545-1
Ubuntu:24.04:LTSlinux-hwe-6.176.17.0-40.40~24.04.1UBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-nvidia-6.176.17.0-1026.26UBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1028.28USN-8491-1
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1028.28UBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-43125
Ubuntu:25.10linux-oracle6.17.0-1018.18USN-8490-1
Ubuntu:25.10linux-oracle6.17.0-1018.18UBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-oracle-6.176.17.0-1018.18~24.04.1UBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-oracle-6.176.17.0-1018.18~24.04.1USN-8490-1
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:25.10linux-raspi6.17.0-1021.21USN-8546-1
Ubuntu:25.10linux-raspi6.17.0-1021.21UBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-43125
Ubuntu:25.10linux-realtime6.17.0-1017.19UBUNTU-CVE-2026-43125
Ubuntu:25.10linux-realtime6.17.0-1017.19USN-8490-2
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-43125
Ubuntu:25.10linux-riscv6.17.0-40.40.1UBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-43125
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-43125
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-43125

Affected products (as reported)

VendorProductVersions
Linux Linux 7210cb7a72a22303cdb225bd1aea28697a17bbae – before 0270664871616eb3a5c864b9aa17be76fd35b9207210cb7a72a22303cdb225bd1aea28697a17bbae – before c98d071a1ca903b705316225e47006aaa20e989c7210cb7a72a22303cdb225bd1aea28697a17bbae – before 2deafd015ea9a0e75ee5764e20eb1e16bd73efd87210cb7a72a22303cdb225bd1aea28697a17bbae – before 67288113c5e6cf9e659b4065c0ed6f16100e0c717210cb7a72a22303cdb225bd1aea28697a17bbae – before 082083c9fbd99422a0370fe2102144a231c9f5d67210cb7a72a22303cdb225bd1aea28697a17bbae – before 5f053a2e7209d326cbbc07738fa6d6893d3074387210cb7a72a22303cdb225bd1aea28697a17bbae – before 080e5563f878c64e697b89e7439d730d0daad882
Linux Linux 3.4

Weakness: CWE-130, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References