SB2026091935 - Race condition in Linux kernel block null_blk driver
Published: September 19, 2026
Security Bulletin ID
SB2026091935
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Race condition (CVE-ID: CVE-2026-90184)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to a race condition in the null_blk configfs attribute store methods when concurrently updating device configuration attributes during device setup. A local privileged user can modify a device configuration attribute during device setup to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/32456a85995579e56c60cc53c357cda75a9d4f7c
- https://git.kernel.org/stable/c/4e1f23f9c33c156be7e313b40695af5a3a834739
- https://git.kernel.org/stable/c/6352e7ead2d8111802a554eeb94886f5a9894bb9
- https://git.kernel.org/stable/c/7de792b4c48fba02a36a8077032f7d5093c925e5
- https://git.kernel.org/stable/c/aed8af338a09a64d63b068a803c4ecfc5701dd4c
- https://git.kernel.org/stable/c/d3d35dd045a35991bf6fd13de5f293e6dd7bf3b3