SB20261022143 - NULL pointer dereference in Linux kernel net dsa driver

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Main Vulnerability Database SB20261022143

SB20261022143 - NULL pointer dereference in Linux kernel net dsa driver

Published: October 22, 2026

Security Bulletin ID SB20261022143
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-2026-98565)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service by triggering a kernel NULL pointer dereference.

The vulnerability exists due to a null pointer dereference in mt7530_remove() in drivers/net/dsa/mt7530-mdio.c when removing or unbinding an MT7621 or MT7531 switch device. A local privileged user can unload the driver module or trigger a sysfs unbind to cause regulator_disable() to operate on uninitialized core or I/O supply pointers and crash the kernel.


Remediation

Install update from vendor's website.

References