Medium 5.5Published May 1, 2026

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

Updated under an hour ago (Oct 27, 2026, 12:50 AM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 7f46a0b7327ae261f9981888708dbca22c283900 before a3db46d5f4df92630a96f7bc77b60e75c2353e06; from 7f46a0b7327ae261f9981888708dbca22c283900 before 7129632cab3e4d23510b21930aa73b8d97a859f5; from 7f46a0b7327ae261f9981888708dbca22c283900 before cfa774e6c920c81e700327bf10db8cb50d5db456; from 7f46a0b7327ae261f9981888708dbca22c283900 before c53cf44588a93000f71817a6bb87a66353c48dee; from 7f46a0b7327ae261f9981888708dbca22c283900 before 89c65f2fcd8801365b410f40a427cbcd7f4c28e9; from 7f46a0b7327ae261f9981888708dbca22c283900 before bf16bca6653679d8a514d6c1c5a2c67065033f14	CNA record
linux linux_kernel linux:linux_kernel	from 5.19 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; 7.0; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/a3db46d5f4df92630a96f7bc77b60e75c2353e06	patch
https://git.kernel.org/stable/c/7129632cab3e4d23510b21930aa73b8d97a859f5	patch
https://git.kernel.org/stable/c/cfa774e6c920c81e700327bf10db8cb50d5db456	patch
https://git.kernel.org/stable/c/c53cf44588a93000f71817a6bb87a66353c48dee	patch
https://git.kernel.org/stable/c/89c65f2fcd8801365b410f40a427cbcd7f4c28e9	patch
https://git.kernel.org/stable/c/bf16bca6653679d8a514d6c1c5a2c67065033f14	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.