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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 environments using the USB Audio Class driver, and defenders should assess exposure and prioritize verifying local privilege escalation risks. The vulnerability has a high severity score and could have significant operational impacts if exploited. Limited details are available about affected versions, exploitation

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
2026-10-14
Advisory published
2026-09-08
Advisory updated
2026-10-14

Who should care

Defenders responsible for Windows environments using the USB Audio Class driver should assess exposure and prioritize verifying local privilege escalation 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 prioritize verifying exposure and assessing local privilege escalation risks in Windows environments using the USB Audio Class driver.

  • Verification of local privilege escalation risks in Windows environments
  • Assessment of exposure in systems using the USB Audio Class driver
  • Monitoring for potential exploitation attempts

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 particularly dangerous in Windows environments where the USB Audio Class driver is used, as it could allow an attacker to gain elevated privileges and potentially access sensitive information or disrupt system operations. The vulnerability has been assigned a high CVSS score, indicating its potential severity.

Defensive priority

Defenders should prioritize verifying exposure and assessing local privilege escalation risks in Windows environments using the USB Audio Class driver.

Recommended defensive actions

  • Verify exposure by checking Windows environments using the USB Audio Class driver
  • Assess local privilege escalation risks
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD detail page provide information about the vulnerability, but limited details are available about affected versions, exploitation, or 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.