SB2026032573 - Incorrect Register Defaults or Module Parameters in Linux kernel net phy driver

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Main Vulnerability Database SB2026032573

SB2026032573 - Incorrect Register Defaults or Module Parameters in Linux kernel net phy driver

Published: March 25, 2026

Security Bulletin ID SB2026032573
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 security vulnerability.


1) Incorrect Register Defaults or Module Parameters (CVE-ID: CVE-2026-23368)

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

The vulnerability exists due to improper locking order in the phy_led_triggers_register function when handling LED triggers during PHY device probe. A local user can trigger a system call that leads to conflicting lock acquisition sequences, resulting in an AB-BA deadlock between the RTNL mutex and the triggers_list_lock, ultimately causing a kernel deadlock and system hang.

The issue arises when LEDS_TRIGGER_NETDEV and LED_TRIGGER_PHY are both enabled, allowing conflicting lock acquisition orders depending on execution context.


Remediation

Install update from vendor's website.

References