SB2026081562 - NULL pointer dereference in Linux kernel hw mlx5 driver

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Main Vulnerability Database SB2026081562

SB2026081562 - NULL pointer dereference in Linux kernel hw mlx5 driver

Published: August 15, 2026

Security Bulletin ID SB2026081562
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) NULL pointer dereference (CVE-ID: CVE-2026-74395)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [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]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a null pointer dereference in MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT in drivers/infiniband/hw/mlx5/devx.c when handling devx subscribe-event requests and unwinding an error after eventfd acquisition fails. A local user can trigger the error path with a crafted subscribe-event request to cause a denial of service.

The issue occurs because the subscription object is linked into the pending list before fields needed by cleanup are initialized.


Remediation

Install update from vendor's website.

References