CVE-2026-69295 in Windows
Summary
by MITRE • 09/08/2026
Out-of-bounds read in Windows USB Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability described involves a critical out-of-bounds read flaw within the Universal Serial Bus driver subsystem of Microsoft Windows operating systems. This specific type of memory corruption error occurs when the software reads data from a memory location that is outside the boundaries of an intended buffer or array structure. In the context of USB drivers, which handle complex communication protocols and device enumeration processes, such errors can arise during the parsing of descriptor structures sent by connected peripherals. When the driver fails to properly validate the length fields contained within these descriptors before accessing them, it may attempt to read memory addresses that do not belong to the allocated buffer space. This behavior violates fundamental principles of safe memory management and represents a significant deviation from secure coding standards designed to prevent unauthorized data access.
From a technical perspective, this flaw aligns with Common Weakness Enumeration identifier CWE-125, which defines out-of-bounds read vulnerabilities. The root cause typically stems from insufficient validation of input parameters derived from external devices before they are processed by the kernel-mode driver code. Because USB drivers operate at a high privilege level within the operating system architecture, any memory access error in this layer can have severe consequences for system stability and security integrity. An attacker who has physical access to the machine or control over a connected device can craft malicious USB descriptors that trigger this out-of-bounds read condition. By carefully constructing these inputs, an adversary can force the driver to leak sensitive information from adjacent memory regions into user-accessible space, potentially revealing kernel pointers, cryptographic keys, or other critical system data.
The operational impact of this vulnerability extends beyond mere information disclosure due to its potential for local privilege escalation. While out-of-bounds reads are often categorized as information leakage issues, in the context of Windows drivers, they can serve as a precursor to more severe exploitation techniques such as arbitrary code execution. If an attacker can predict or influence memory layout through additional techniques like heap spraying or kernel pool manipulation, the leaked data might provide the necessary offsets and pointers required to hijack control flow within the kernel. This capability allows an unauthorized user account to execute code with SYSTEM-level privileges, effectively bypassing all standard access controls and security boundaries implemented by the operating system. Such escalation compromises the confidentiality, integrity, and availability of the entire host environment.
This vulnerability is mapped to several tactics in the MITRE ATT&CK framework that describe adversary behavior during post-exploitation phases. Specifically, it relates to techniques involving privilege escalation where attackers leverage kernel vulnerabilities to gain higher-level access. The exploitation path often involves initial device connection followed by rapid interaction with the driver stack to trigger the memory error and subsequently manipulate system state for elevated control. Defense-in-depth strategies are essential here since physical security controls may be bypassed if an attacker gains brief physical proximity or uses specialized hardware tools like BadUSB devices that emulate malicious peripherals automatically upon connection.
Mitigation efforts primarily rely on applying vendor-supplied patches that address the underlying code defects within the USB driver implementation. Organizations should ensure that all systems are updated with the latest security updates released by Microsoft to close these gaps in memory safety checks. Additionally, implementing strict physical access controls and port blocking policies can reduce the attack surface presented by this vulnerability. For environments where hardware restrictions are not feasible, deploying endpoint detection and response solutions capable of monitoring for anomalous driver behavior or unexpected kernel-mode activity may help detect exploitation attempts before they result in full system compromise. Regular auditing of connected devices and enforcing strict USB device whitelisting policies further reduces the risk associated with untrusted peripheral interactions.