SB2026050247 - NULL pointer dereference in Linux kernel core lag driver
Published: May 2, 2026
Security Bulletin ID
SB2026050247
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-43013)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in mlx5_ldev_add_debugfs() when accessing debugfs entries created without a valid LAG context. A local user can access a specially exposed debugfs interface to cause a denial of service.
The issue occurs when debugfs entries are created even though no valid ldev pointer is available.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/7129632cab3e4d23510b21930aa73b8d97a859f5
- https://git.kernel.org/stable/c/89c65f2fcd8801365b410f40a427cbcd7f4c28e9
- https://git.kernel.org/stable/c/a3db46d5f4df92630a96f7bc77b60e75c2353e06
- https://git.kernel.org/stable/c/bf16bca6653679d8a514d6c1c5a2c67065033f14
- https://git.kernel.org/stable/c/c53cf44588a93000f71817a6bb87a66353c48dee
- https://git.kernel.org/stable/c/cfa774e6c920c81e700327bf10db8cb50d5db456