CVE-2026-50412 in Windows
Summary
by MITRE • 07/14/2026
Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical stack-based buffer overflow condition within the Windows NTFS file system implementation that enables local privilege escalation for authenticated attackers. The flaw occurs when the operating system processes certain file system operations that involve stack memory allocation for NTFS-related functions, creating an opportunity for malicious code execution through improper bounds checking. The vulnerability specifically manifests during kernel-mode operations where insufficient validation of input parameters leads to memory corruption in stack-based buffers. Attackers who already possess legitimate user credentials can exploit this weakness to execute arbitrary code with elevated privileges, potentially gaining SYSTEM-level access to the compromised system. The technical implementation involves the manipulation of file system control structures or specific NTFS metadata operations that trigger the overflow condition when processing user-supplied data within kernel memory space.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with a reliable pathway to establish persistent access to target systems while maintaining stealth in network environments. Once exploited, successful exploitation allows threat actors to bypass standard security controls and potentially move laterally within networks by accessing system resources that would normally be restricted to privileged users. The vulnerability's local nature means that physical or remote access is not required for exploitation, making it particularly dangerous in enterprise environments where legitimate user accounts may exist on target systems. This type of vulnerability aligns with CWE-121 stack-based buffer overflow classification and represents a common attack vector that has been documented extensively in security research literature. The exploitability characteristics suggest that the vulnerability likely resides in file system parsing routines or kernel memory management functions that handle NTFS-specific operations.
Mitigation strategies for this vulnerability should include immediate deployment of Microsoft security patches as part of routine system maintenance protocols, alongside network monitoring to detect unusual privilege escalation activities. System administrators should implement the principle of least privilege and regularly audit user accounts to minimize potential attack surfaces. The vulnerability's characteristics align with ATT&CK technique T1068 for local privilege escalation and T1547 for registry run keys, indicating that exploitation may involve multiple attack vectors beyond simple code execution. Security teams should monitor for abnormal file system activity patterns and implement application whitelisting policies to prevent exploitation of such kernel-level vulnerabilities. Additionally, regular vulnerability assessments should include specific testing for buffer overflow conditions in file system components, particularly focusing on kernel-mode drivers and system services that handle user input directly.
The broader implications of this vulnerability highlight the ongoing challenges in securing complex operating system file systems where multiple legacy components interact with modern security models. The presence of such flaws in core operating system components demonstrates the critical importance of continuous security testing and vulnerability management programs. Organizations should maintain comprehensive incident response procedures that account for kernel-level exploits, as these vulnerabilities often require specialized forensic analysis and system recovery techniques. The vulnerability also underscores the necessity of implementing layered security approaches where multiple defensive controls work together to protect against exploitation attempts. Regular security awareness training for system administrators helps ensure proper patch management practices and recognition of potential exploitation indicators in system logs.