Linux Kernel up to 6.19.11 __mlx5_lag_dev_add_mdev null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 6.1.167/6.6.133/6.12.80/6.18.21/6.19.11. This affects the function __mlx5_lag_dev_add_mdev. Such manipulation leads to null pointer dereference. This vulnerability is uniquely identified as CVE-2026-43013. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.167/6.6.133/6.12.80/6.18.21/6.19.11. It has been rated as critical. Affected by this issue is the function __mlx5_lag_dev_add_mdev. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: lag: Check for LAG device before creating debugfs __mlx5_lag_dev_add_mdev() may return 0 (success) even when an error occurs that is handled gracefully. Consequently, the initialization flow proceeds to call mlx5_ldev_add_debugfs() even when there is no valid LAG context. mlx5_ldev_add_debugfs() blindly created the debugfs directory and attributes. This exposed interfaces (like the members file) that rely on a valid ldev pointer, leading to potential NULL pointer dereferences if accessed when ldev is NULL. Add a check to verify that mlx5_lag_dev(dev) returns a valid pointer before attempting to create the debugfs entries.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-43013 since 05/01/2026. The exploitation is known to be difficult. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 323086 (SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:2482-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.168, 6.6.134, 6.12.81, 6.18.22 or 6.19.12 eliminates this vulnerability. Applying the patch a3db46d5f4df92630a96f7bc77b60e75c2353e06/7129632cab3e4d23510b21930aa73b8d97a859f5/cfa774e6c920c81e700327bf10db8cb50d5db456/c53cf44588a93000f71817a6bb87a66353c48dee/89c65f2fcd8801365b410f40a427cbcd7f4c28e9/bf16bca6653679d8a514d6c1c5a2c67065033f14 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (323086). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 323086
Nessus Name: SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:2482-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.168/6.6.134/6.12.81/6.18.22/6.19.12
Patch: a3db46d5f4df92630a96f7bc77b60e75c2353e06/7129632cab3e4d23510b21930aa73b8d97a859f5/cfa774e6c920c81e700327bf10db8cb50d5db456/c53cf44588a93000f71817a6bb87a66353c48dee/89c65f2fcd8801365b410f40a427cbcd7f4c28e9/bf16bca6653679d8a514d6c1c5a2c67065033f14

Timelineinfo

05/01/2026 Advisory disclosed
05/01/2026 +0 days CVE reserved
05/01/2026 +0 days VulDB entry created
06/27/2026 +57 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43013 (🔒)
GCVE (CVE): GCVE-0-2026-43013
GCVE (VulDB): GCVE-100-360692

Entryinfo

Created: 05/01/2026 17:58
Updated: 06/27/2026 15:10
Changes: 05/01/2026 17:58 (59), 06/27/2026 15:10 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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