CVE-2026-43013

System crash via invalid mlx5 LAG debugfs state

Published May 1, 2026 · Updated May 1, 2026

NULL pointer dereference in affected Linux Kernel revisions allows local users to crash the system through invalid mlx5 LAG debugfs entries. mlx5_ldev_add_debugfs creates files after __mlx5_lag_dev_add_mdev reports success without a valid LAG context, leaving attributes to dereference a null ldev pointer. Triggering the crash requires local access to an exposed LAG debugfs attribute after the mlx5 initialization error path.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected Linux Kernel revisions allows local users to crash the system through invalid mlx5 LAG debugfs entries. mlx5_ldev_add_debugfs creates files after __mlx5_lag_dev_add_mdev reports success without a valid LAG context, leaving attributes to dereference a null ldev pointer. Triggering the crash requires local access to an exposed LAG debugfs attribute after the mlx5 initialization error path.

The record

CVE
CVE-2026-43013
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.19
  2. Affected versionversion=7f46a0b7327ae261f9981888708dbca22c283900 <7129632cab3e4d23510b21930aa73b8d97a859f5
  3. Affected versionversion=7f46a0b7327ae261f9981888708dbca22c283900 <89c65f2fcd8801365b410f40a427cbcd7f4c28e9
  4. Affected versionversion=7f46a0b7327ae261f9981888708dbca22c283900 <a3db46d5f4df92630a96f7bc77b60e75c2353e06
  5. Affected versionversion=7f46a0b7327ae261f9981888708dbca22c283900 <bf16bca6653679d8a514d6c1c5a2c67065033f14
  6. Affected versionversion=7f46a0b7327ae261f9981888708dbca22c283900 <c53cf44588a93000f71817a6bb87a66353c48dee
  7. Affected versionversion=7f46a0b7327ae261f9981888708dbca22c283900 <cfa774e6c920c81e700327bf10db8cb50d5db456

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.19; version=7f46a0b7327ae261f9981888708dbca22c283900 <7129632cab3e4d23510b21930aa73b8d97a859f5; version=7f46a0b7327ae261f9981888708dbca22c283900 <89c65f2fcd8801365b410f40a427cbcd7f4c28e9; version=7f46a0b7327ae261f9981888708dbca22c283900 <a3db46d5f4df92630a96f7bc77b60e75c2353e06; version=7f46a0b7327ae261f9981888708dbca22c283900 <bf16bca6653679d8a514d6c1c5a2c67065033f14; version=7f46a0b7327ae261f9981888708dbca22c283900 <c53cf44588a93000f71817a6bb87a66353c48dee; version=7f46a0b7327ae261f9981888708dbca22c283900 <cfa774e6c920c81e700327bf10db8cb50d5db456

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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