Windows Fast FAT File System Driver Information Disclosure Vulnerability
CVE-2026-70277
Summary
Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.
Products covered
Windows 11 version 26H1 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems
Remediation
Install KB5124012.
Vendor-listed fixes
10.0.28000.2954
CVEs in this advisory 1
Updates
- Published by Microsoft Security Response Center
The publication date reported by the vendor.
- 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.