CVE-2026-83737
Summary
by MITRE • 10/13/2026
Out-of-bounds read in Windows NTFS allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability described involves an out-of-bounds read condition within the New Technology File System driver, commonly referred to as NTFS, which is a core component of Microsoft Windows operating systems responsible for managing how data is stored, retrieved, and organized on storage devices. This specific flaw arises from improper validation checks when processing file system structures or metadata operations performed by authorized users. While the attacker requires local access and valid credentials to exploit this issue, the nature of an out-of-bounds read allows them to leak sensitive information that resides in adjacent memory locations beyond the intended buffer boundaries. Such leaks can potentially expose kernel-mode data, cryptographic keys, internal process states, or other confidential system details that are not meant to be accessible through standard file operations.
From a technical perspective, this flaw is classified under CWE-125, which defines out-of-bounds read vulnerabilities where software reads memory beyond the end of a buffer. In the context of NTFS, this typically occurs during complex parsing routines or when handling malformed or specifically crafted file system requests that trigger edge cases in the driver's logic. The attacker leverages their authorized status to issue specific commands or create files with particular attributes that cause the driver to access memory addresses it should not. Because the vulnerability resides within a privileged subsystem, the impact extends beyond simple data disclosure; it can facilitate further exploitation by providing attackers with critical information needed for privilege escalation attacks or bypassing security controls like Data Execution Prevention and Address Space Layout Randomization if specific patterns are leaked.
The operational impact of this vulnerability is primarily centered on confidentiality rather than integrity or availability in its immediate form, although the disclosed information serves as a stepping stone for more severe consequences. An attacker who successfully exploits this flaw can gain unauthorized access to sensitive data stored within the system's memory space. This could include passwords, session tokens, encryption keys, or proprietary code segments belonging to other processes running on the same machine. The ability to read arbitrary kernel memory significantly degrades the security posture of the affected Windows environment, as it undermines the isolation mechanisms designed to protect different user contexts and system components from one another.
To mitigate this risk, organizations must ensure that all systems are updated with the latest cumulative updates provided by Microsoft, which contain patches addressing these specific out-of-bounds read conditions in NTFS. Security administrators should prioritize applying security rollouts promptly after they are released for supported versions of Windows. Additionally, implementing strict access controls and monitoring file system activity can help detect anomalous behavior that might indicate an attempt to exploit this vulnerability. While the requirement for local authorized access limits the attack surface compared to remote vulnerabilities, it remains a critical concern in environments where multiple users share systems or where lateral movement is possible after initial compromise. The exploitation of this flaw aligns with ATT&CK techniques related to unauthorized data collection and memory disclosure, emphasizing the need for robust endpoint detection and response capabilities that can identify unusual kernel-level interactions.