CVE-2026-69286 in Windows
Summary
by MITRE • 09/08/2026
Out-of-bounds read in Windows USB Audio Class driver (usbaudio.sys) allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified involves a critical out-of-bounds read flaw within the Microsoft Windows USB Audio Class driver, specifically usbaudio.sys. This component is responsible for managing audio devices that adhere to the Universal Serial Bus (USB) Audio Device Class specification, facilitating communication between the operating system and various peripheral hardware such as microphones, headphones, and speakers. The core technical issue stems from improper validation of input data or buffer boundaries during the processing of USB control transfers or interrupt endpoints associated with audio streams. When an authorized attacker interacts with a maliciously crafted USB audio device or manipulates specific driver interfaces, they can trigger this memory access violation. Unlike out-of-bounds writes which often lead to code execution, an out-of-bounds read primarily results in the disclosure of sensitive information residing in adjacent memory locations that were not intended for exposure by the application or system process accessing the driver.
From a technical perspective, this flaw represents a classic boundary condition error where the driver fails to verify that the requested data length does not exceed the allocated buffer size before performing the read operation. This allows the attacker to retrieve arbitrary kernel-mode memory contents into user-space buffers under certain conditions. The impact of such an information disclosure vulnerability is significant because it can lead to the leakage of cryptographic keys, session tokens, or other sensitive system state information that resides in physical memory adjacent to the audio buffer. In a local context, where the attacker already possesses authorized access privileges, this capability serves as a powerful primitive for further exploitation. By carefully analyzing the leaked data patterns, an attacker may be able to bypass security mechanisms such as Data Execution Prevention (DEP) or Address Space Layout Randomization (ASLR), thereby elevating their privilege level from a standard user account to that of SYSTEM or kernel-level access.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-125, which describes Out-of-bounds Read vulnerabilities where software reads data past the end, or before the beginning, of the intended buffer. In terms of offensive security frameworks, this behavior corresponds to techniques found in the MITRE ATT&CK catalog under Information Discovery and potentially Privilege Escalation vectors such as T1059 Command and Scripting Interpreter if combined with other exploits, though primarily it facilitates reconnaissance through memory scraping. The existence of such a flaw in core system drivers highlights the risks associated with complex kernel-mode codebases where manual memory management or insufficient bounds checking can persist despite rigorous testing processes.
Mitigation strategies for this vulnerability prioritize immediate patching via official Microsoft security updates that address the specific logic errors within usbaudio.sys. Organizations should ensure their Windows environments are fully updated to include the latest cumulative patches which contain fixes for known driver vulnerabilities. In addition to software remediation, physical access controls remain a critical defense layer given that many USB-based attacks require direct interaction with hardware ports. Implementing strict policies regarding unauthorized peripheral device connections and utilizing endpoint detection and response solutions capable of monitoring anomalous memory access patterns can help detect exploitation attempts in real-time. Furthermore, enabling kernel-mode exploit protection features such as Kernel Patch Protection (PatchGuard) and Hardware-enforced Stack Protection adds additional layers of defense that may prevent the successful execution of follow-on attacks even if information disclosure occurs.