CVE-2026-69440
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Windows MIDI Service TOCTOU Local Privilege Escalation

Publication date: 2026-09-08

Last updated on: 2026-09-09

Assigner: Microsoft Corporation

Description
Time-of-check time-of-use (toctou) race condition in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.

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Meta Information

Published
2026-09-08
Last Modified
2026-09-09
Generated
2026-09-09
AI Q&A
2026-09-09
EPSS Evaluated
N/A
NVD
CVE-2026-69440

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_midi_service_module *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-367 The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

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Executive Summary

This is a time-of-check time-of-use (TOCTOU) race condition in the Windows MIDI Service Module. It allows an authorized local attacker to exploit timing issues to elevate their privileges on the system.

Impact Analysis

An attacker could gain higher-level permissions on your system, potentially allowing them to install programs, view or delete data, or create new accounts with full user rights.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows MIDI Service Module. Monitor Microsoft's security advisories for patches and disable the MIDI service if not required.

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