SB2026091926 - Race condition in Linux kernel block null_blk driver

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Main Vulnerability Database SB2026091926

SB2026091926 - Race condition in Linux kernel block null_blk driver

Published: September 19, 2026

Security Bulletin ID SB2026091926
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Race condition (CVE-ID: CVE-2026-90189)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause block-device registration to fail.

The vulnerability exists due to a race condition in null_blk initialization when creating and powering on a configfs device during module initialization. A local user can race configfs device creation and power-on operations with module initialization to cause block-device registration to fail.


Remediation

Install update from vendor's website.

References