Local privilege escalation via USB audio race
Published Sep 8, 2026 · Updated Sep 9, 2026
A TOCTOU race in the Microsoft Windows USB Audio Class driver allows local users with existing access to elevate privileges. The flaw resides in usbaudio.sys, but Microsoft has not disclosed which resource is checked and later used or how the associated integer underflow contributes. Exploitation requires low-privileged local access and winning a high-complexity race; successful attacks gain elevated privileges without user interaction.
Summary
What happened
A TOCTOU race in the Microsoft Windows USB Audio Class driver allows local users with existing access to elevate privileges. The flaw resides in usbaudio.sys, but Microsoft has not disclosed which resource is checked and later used or how the associated integer underflow contributes. Exploitation requires low-privileged local access and winning a high-complexity race; successful attacks gain elevated privileges without user interaction.
The record
- CVE
- CVE-2026-69859
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-191, CWE-367, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9245
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo