Microsoft Windows NTFS Heap-Based Buffer Overflow Vulnerability Allowing Local Remote Code Execution

A heap-based buffer overflow vulnerability has been identified in the Windows NTFS file system. This vulnerability allows an unauthorized attacker to execute code locally. The issue arises when a user mounts a specially crafted virtual hard disk (VHD) file, which can lead to the execution of malicious code on the system.

Impact

Exploitation of this vulnerability could lead to unauthorized local execution of code, allowing an attacker to execute arbitrary commands or programs with the privileges of the user who mounted the VHD file.

Remediation

Users can apply the security update for this vulnerability, which is included in the July 2026 Monthly Rollup, available through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles KB5099444 for Windows Server 2012 R2, KB5099445 for Windows Server 2012, KB5099536 for Windows Server 2025, KB5101650 for Windows 11 versions 24H2 and 25H2, KB5099539 for Windows 10 versions 22H2 and 21H2, KB5099535 for Windows Server 2016, KB5099538 for Windows Server 2019, and KB5099540 for Windows Server 2022.