SB20260828111 - Deadlock in Linux kernel hwmon occ driver

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Main Vulnerability Database SB20260828111

SB20260828111 - Deadlock in Linux kernel hwmon occ driver

Published: August 28, 2026

Security Bulletin ID SB20260828111
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) Deadlock (CVE-ID: CVE-2026-80660)

CWE-ID: CWE-833 - Deadlock

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 deadlock in the occ hwmon sysfs device handling in drivers/hwmon/occ/common.c when unregistering sysfs-backed devices during concurrent sysfs callbacks. A local user can trigger concurrent sysfs access and device shutdown activity to cause a denial of service.

The issue involves circular locking between the OCC mutex and sysfs callback draining during device deactivation or shutdown.


Remediation

Install update from vendor's website.

References