---
id: CVE-2026-43013
title: 'net/mlx5: lag: Check for LAG device before creating debugfs'
summary: |-
  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. Cons…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 <
    a3db46d5f4df92630a96f7bc77b60e75c2353e06
  - >-
    Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 <
    7129632cab3e4d23510b21930aa73b8d97a859f5
  - >-
    Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 <
    cfa774e6c920c81e700327bf10db8cb50d5db456
  - >-
    Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 <
    c53cf44588a93000f71817a6bb87a66353c48dee
  - >-
    Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 <
    89c65f2fcd8801365b410f40a427cbcd7f4c28e9
  - >-
    Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 <
    bf16bca6653679d8a514d6c1c5a2c67065033f14
  - Linux 5.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:25:52.038393Z'
published: '2026-05-01'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:32:26.150Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43013'
references:
  - url: 'https://git.kernel.org/stable/c/a3db46d5f4df92630a96f7bc77b60e75c2353e06'
  - url: 'https://git.kernel.org/stable/c/7129632cab3e4d23510b21930aa73b8d97a859f5'
  - url: 'https://git.kernel.org/stable/c/cfa774e6c920c81e700327bf10db8cb50d5db456'
  - url: 'https://git.kernel.org/stable/c/c53cf44588a93000f71817a6bb87a66353c48dee'
  - url: 'https://git.kernel.org/stable/c/89c65f2fcd8801365b410f40a427cbcd7f4c28e9'
  - url: 'https://git.kernel.org/stable/c/bf16bca6653679d8a514d6c1c5a2c67065033f14'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02027
ingestedAt: '2026-11-06T15:54:04.038Z'
---

## Overview

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.

## Affected

- `Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 < a3db46d5f4df92630a96f7bc77b60e75c2353e06`
- `Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 < 7129632cab3e4d23510b21930aa73b8d97a859f5`
- `Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 < cfa774e6c920c81e700327bf10db8cb50d5db456`
- `Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 < c53cf44588a93000f71817a6bb87a66353c48dee`
- `Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 < 89c65f2fcd8801365b410f40a427cbcd7f4c28e9`
- `Linux >= 7f46a0b7327ae261f9981888708dbca22c283900 < bf16bca6653679d8a514d6c1c5a2c67065033f14`
- `Linux 5.19`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.