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CVE-2026-69859 Microsoft CVE debrief

A time-of-check time-of-use (TOCTOU) race condition vulnerability exists in the Windows USB Audio Class driver (usbaudio.sys), which could allow an authorized attacker to elevate privileges locally. The CVE record was published on 2026-09-08T18:19:57.273Z and has not been modified since then. The NVD entry is currently Awaiting Analysis. This vulnerability affects Windows systems with authorized user access. Defenders and administrators should assess exposure and potential risks. The vulnerability has a high severity score and requires immediate attention. The CVE Program and NVD provide official records and assessments of the vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-11
Advisory published
2026-09-08
Advisory updated
2026-09-11

Who should care

Defenders and administrators responsible for Windows systems, especially those with authorized user access, should assess exposure and potential risks.

Why it matters

CVE-2026-69859 is a high-severity vulnerability in the Windows USB Audio Class driver that could allow authorized attackers to elevate privileges locally. Defenders should verify exposure, assess risks, and monitor for potential exploitation attempts.

  • Verification of exposure and potential local privilege escalation risks.
  • Assessment of Windows USB Audio Class driver configurations and versions.
  • Monitoring for potential exploitation attempts and anomalies.

Technical summary

The vulnerability exists in the Windows USB Audio Class driver (usbaudio.sys) and could allow an authorized attacker to elevate privileges locally through a time-of-check time-of-use (TOCTOU) race condition. This type of vulnerability can be exploited by an attacker with authorized access to the system. The vulnerability has been publicly disclosed and requires verification of exposure and assessment of local privilege escalation risks.

Defensive priority

Defenders should prioritize verifying exposure and assessing local privilege escalation risks, especially in environments with authorized user access.

Recommended defensive actions

  • Verify exposure by checking Windows USB Audio Class driver versions and configurations.
  • Assess local privilege escalation risks in environments with authorized user access.
  • Monitor for potential exploitation attempts and anomalies in USB Audio Class driver usage.

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, but further verification is needed to determine affected versions and remediation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69859 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69859

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-69859 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69859

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.