SB20260828110 - Deadlock in Linux kernel mmc host driver

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Main Vulnerability Database SB20260828110

SB20260828110 - Deadlock in Linux kernel mmc host driver

Published: August 28, 2026

Security Bulletin ID SB20260828110
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-2026-80659)

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 caused by recursive mutex acquisition in the vub300 mmc host driver when handling a command response timeout and resetting the USB device. A local user can trigger a command timeout that leads to a recursive acquisition of cmd_mutex to cause a denial of service.

The issue occurs because the reset path re-enters vub300_pre_reset() while the worker thread still holds cmd_mutex.


Remediation

Install update from vendor's website.

References