CVE-2026-85815 in Windows
Summary
by MITRE • 10/14/2026
Out-of-bounds read in Windows Device Association Service 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 Windows Device Association Service represents a critical memory safety flaw that compromises the integrity of system data through unauthorized disclosure rather than execution. This service, which is integral to managing peripheral connections and device pairing on Microsoft operating systems, contains logic errors in how it handles input parameters or internal state variables during association processes. Specifically, the software fails to properly validate array indices or buffer boundaries before accessing memory locations. When an authorized attacker interacts with this service, they can trigger a condition where the application reads data from a memory address that lies outside the intended allocation boundary. This type of flaw is technically classified under CWE-125, which defines out-of-bounds read vulnerabilities as errors resulting in reading past the end of a buffer or array.
The operational impact of this vulnerability centers on information disclosure rather than privilege escalation or remote code execution. Because the attacker must be authorized to interact with the service, the threat model is limited to local attackers who already possess valid credentials on the target system. However, even within this constrained scope, the ability to read arbitrary memory contents can lead to significant security compromises. The leaked information may include sensitive kernel data structures, cryptographic keys, session tokens, or other confidential details stored in adjacent memory regions. Such disclosures can facilitate further attacks by providing attackers with internal state information that aids in crafting more sophisticated exploits or bypassing additional security controls. This aligns with the MITRE ATT&CK technique T1005, which covers Data from Local System, indicating that the vulnerability serves as a mechanism for exfiltrating data directly from the compromised host without requiring network-based access vectors.
From a technical perspective, out-of-bounds reads often stem from insufficient boundary checks in C or C++ codebases where manual memory management is prevalent. In the context of Windows services, these errors may occur during parsing of device descriptors, handling of USB HID reports, or processing of Bluetooth pairing requests if the service does not rigorously verify that input lengths match expected buffer sizes. The lack of proper sanitization allows an attacker to manipulate specific inputs to cause the pointer arithmetic to reference invalid memory regions. While modern operating systems employ protections such as Data Execution Prevention and Address Space Layout Randomization, these measures do not prevent information leakage from out-of-bounds reads unless additional mitigations like Control Flow Guard or structured exception handling are effectively utilized by the service implementation itself.
Mitigation strategies for this vulnerability primarily rely on timely application of vendor-supplied patches that correct the underlying memory access logic. System administrators should ensure that all Windows updates related to device drivers and core system services are installed promptly, as Microsoft typically releases security fixes through cumulative update packages or out-of-band hotfixes depending on severity. In environments where patching is delayed due to operational constraints, network segmentation can help isolate systems running the affected service from untrusted networks, although this does not mitigate local threats posed by authorized users. Additionally, implementing strict least-privilege policies ensures that only essential processes and user accounts have access to the Device Association Service, thereby reducing the attack surface available to potential insiders or malware operating under compromised credentials. Regular auditing of system logs for unusual service interactions can also aid in detecting exploitation attempts before significant data loss occurs.