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VulnerabilityPublished Updated

CVE-2026-43013: Linux kernel · net/mlx5: lag: Check for LAG device before creating debugfs

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in cfa774e6c920c81e700327bf10db8cb50d5db456 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:33 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in cfa774e6c920c81e700327bf10db8cb50d5db456, c53cf44588a93000f71817a6bb87a66353c48dee, bf16bca6653679d8a514d6c1c5a2c67065033f14 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 7f46a0b7327ae261f9981888708dbca22c283900, < cfa774e6c920c81e700327bf10db8cb50d5db456
Fixed in
  • cfa774e6c920c81e700327bf10db8cb50d5db456
LinuxLinuxAffected
  • ≥ 7f46a0b7327ae261f9981888708dbca22c283900, < c53cf44588a93000f71817a6bb87a66353c48dee
Fixed in
  • c53cf44588a93000f71817a6bb87a66353c48dee
LinuxLinuxAffected
  • ≥ 7f46a0b7327ae261f9981888708dbca22c283900, < bf16bca6653679d8a514d6c1c5a2c67065033f14
Fixed in
  • bf16bca6653679d8a514d6c1c5a2c67065033f14
LinuxLinuxAffected
  • ≥ 7f46a0b7327ae261f9981888708dbca22c283900, < a3db46d5f4df92630a96f7bc77b60e75c2353e06
Fixed in
  • a3db46d5f4df92630a96f7bc77b60e75c2353e06
LinuxLinuxAffected
  • ≥ 7f46a0b7327ae261f9981888708dbca22c283900, < 7129632cab3e4d23510b21930aa73b8d97a859f5
Fixed in
  • 7129632cab3e4d23510b21930aa73b8d97a859f5
LinuxLinuxAffected
  • ≥ 7f46a0b7327ae261f9981888708dbca22c283900, < 89c65f2fcd8801365b410f40a427cbcd7f4c28e9
Fixed in
  • 89c65f2fcd8801365b410f40a427cbcd7f4c28e9

AI-suggested

A fix is available in the Linux kernel source code as indicated by the listed fixed commit versions. Users should update to a kernel version that includes these fixes to mitigate the vulnerability.

Description

A vulnerability in the Linux kernel's mlx5 driver for Link Aggregation Group (LAG) devices allowed debugfs entries to be created without verifying the existence of a valid LAG context. This could lead to NULL pointer dereferences when accessing certain debugfs interfaces. The issue was fixed by adding a check to ensure a valid LAG device pointer before creating debugfs entries.

References

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