CVE-2026-69527 in Windows
Summary
by MITRE • 09/09/2026
Out-of-bounds read in Windows USB Mass Storage Class Driver allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an out-of-bounds read within the Windows USB Mass Storage Class Driver represents a critical memory safety flaw that compromises the integrity of system data through unauthorized access. This specific defect occurs when the driver fails to properly validate input parameters or buffer boundaries during the processing of USB mass storage requests, leading to a scenario where the application reads beyond the allocated limits of a memory buffer. Such an error is typically classified under CWE-125, which denotes Out-of-bounds Read vulnerabilities, indicating that the software accesses memory locations outside the intended boundary without proper checks or bounds checking mechanisms in place.
From a technical perspective, this flaw allows for the local disclosure of sensitive information because the driver may inadvertently expose contents from adjacent memory regions to the attacker-controlled process. When an authorized user interacts with a maliciously crafted USB device or triggers specific IOCTL requests that exploit this buffer boundary condition, the operating system retrieves data that was not intended for public consumption. This can include kernel-mode stack variables, heap metadata, or other sensitive structures residing in close proximity to the targeted buffer within memory space. The exploitation does not require privilege escalation beyond what is already granted to the user initiating the interaction, making it a significant risk for environments where users have standard administrative privileges or when untrusted peripherals are connected to systems with less restrictive access controls.
The operational impact of this vulnerability centers on information disclosure rather than direct code execution or denial of service in its primary form. By leveraging this out-of-bounds read, an attacker can gather intelligence about the internal state of the operating system, potentially identifying memory layout patterns that could facilitate further exploitation steps such as bypassing Data Execution Prevention (DEP) or Address Space Layout Randomization (ASLR). In the context of the MITRE ATT&CK framework, this behavior aligns with techniques related to System Information Discovery and potentially Memory Dumping if combined with other vulnerabilities. The ability to read arbitrary memory locations locally can serve as a precursor for more severe attacks, including privilege escalation or remote code execution if additional weaknesses are present in the same subsystem.
Mitigation strategies primarily involve applying vendor-supplied security patches that address the boundary validation logic within the USB Mass Storage Class Driver. System administrators should ensure that all operating systems and drivers are updated to the latest versions provided by Microsoft to close these memory safety gaps. Additionally, implementing strict device control policies can reduce the attack surface by preventing unauthorized or untrusted USB mass storage devices from connecting to critical infrastructure endpoints. Security teams should also monitor for anomalous behavior indicative of memory access violations, although such detection is challenging without advanced endpoint protection capabilities that inspect driver-level interactions and memory integrity in real time.