Windows Fast FAT File System Driver Information Disclosure Vulnerability
CVE-2026-70277
Summary
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Device Health Attestation (DHA) allows an unauthorized attacker to execute code over a network.
Products covered
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2025 (Server Core installation)
Windows Server 2025
Show 2 more products
Windows 11 version 26H1 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems
Remediation
Install KB5120238. Install KB5120242. Install KB5120229. Install KB5120233. Install KB5120228. Install KB5121000.
Vendor-listed fixes
10.0.17763.9121
10.0.20348.5499
10.0.20348.5440
10.0.26100.33296
10.0.26100.33222
10.0.28000.2704
CVEs in this advisory 1
Update history
What changed in later vendor updates
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- The vendor changed its remediation guidance.
Updates
- Published by Microsoft Security Response Center
The publication date reported by the vendor.
- Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
- Added to SecurityAlert
We collected the advisory from the official source.
- Confirmed at the source
Our collector saw this advisory during a later source check.