CVE-2026-83794 in Windows
Summary
by MITRE • 10/14/2026
Out-of-bounds read in Windows Portable Device MTP Driver allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as an out-of-bounds read within the Microsoft Portable Device Media Transfer Protocol driver represents a critical memory safety flaw that compromises the integrity of data access operations on affected Windows systems. This specific defect occurs when the MTP driver processes requests from connected devices, failing to properly validate buffer boundaries before reading data into memory structures. The root cause lies in insufficient checks regarding array indices or pointer arithmetic during the parsing of device-specific commands and metadata exchanges. When an attacker interacts with a maliciously crafted portable device or simulates such hardware through software emulation, they can trigger this logic error by sending specially formatted packets that exceed expected length limits or contain malformed headers. The driver then proceeds to read memory locations beyond the allocated buffer space, potentially retrieving sensitive information stored in adjacent memory regions that were not intended for exposure during normal operation.
From a technical perspective, this flaw aligns with Common Weakness Enumeration category CWE-125, which describes out-of-bounds read vulnerabilities where software reads data past the end or before the beginning of the intended buffer. The operational impact is primarily centered on local information disclosure rather than remote code execution or privilege escalation in its immediate form. An authorized attacker who has already gained access to the system can leverage this vulnerability to extract arbitrary memory contents, which may include cryptographic keys, session tokens, user credentials, or other sensitive data residing in kernel-mode memory spaces adjacent to the vulnerable buffer. This capability significantly lowers the barrier for further exploitation stages, as disclosed information often serves as a stepping stone for more advanced attacks such as privilege escalation via kernel exploits or lateral movement within enterprise networks using stolen authentication material.
The attack vector is classified under MITRE ATT&CK technique T1059, specifically involving command and script interpreters or peripheral device interactions, depending on the exact method used to trigger the driver flaw. Since the vulnerability resides in a user-mode component that interfaces with kernel drivers, it requires physical proximity or local account privileges to initiate the malicious interaction. However, given the prevalence of portable devices like smartphones, external hard drives, and digital cameras connecting to workstations daily, the attack surface is substantial for any organization relying on these peripherals. The lack of proper bounds checking means that even routine operations such as browsing photos or syncing contacts can become vectors if a compromised device is connected. This highlights a broader industry challenge in handling untrusted input from hardware interfaces without rigorous validation mechanisms at every layer of the driver stack.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements to prevent similar memory safety issues. Organizations should prioritize applying the latest security updates released by Microsoft, which typically include fixes for such out-of-bounds errors in system components like the MTP driver. Beyond patch management, implementing strict device control policies through endpoint detection and response solutions can restrict unauthorized peripheral connections, thereby reducing exposure to this specific attack vector. Additionally, developers working on similar drivers should adopt secure coding practices that enforce rigorous input validation and utilize static analysis tools capable of detecting buffer overflow conditions before deployment. Enabling memory protection features such as Data Execution Prevention and Address Space Layout Randomization further mitigates the risk by making it harder for attackers to exploit disclosed information effectively, although these controls do not prevent the initial leak itself but rather limit subsequent exploitation capabilities.