CVE-2026-83892 in Windows
Summary
by MITRE • 10/14/2026
Out-of-bounds read in HID Parser Library allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified within the Human Interface Device (HID) Parser Library represents a critical memory safety flaw classified as an out-of-bounds read, corresponding to CWE-125 in standard vulnerability taxonomy. This specific type of error occurs when software attempts to access data at a memory location that is outside the boundaries of the intended buffer or array structure. In the context of HID parsing, this typically involves the processing of descriptor reports sent by peripheral devices such as keyboards, mice, game controllers, or specialized input hardware. The parser is responsible for interpreting these binary descriptors to understand how user inputs should be mapped and handled by the operating system. When a malformed or maliciously crafted HID report descriptor is processed, the parsing logic may calculate an incorrect offset or index due to insufficient validation of data lengths or structural integrity checks. This miscalculation leads the application to read memory contents that were not intended for access, potentially exposing sensitive internal state information, stack canaries, or other kernel-mode data structures residing adjacent to the buffer in question.
From a technical perspective, this flaw highlights deficiencies in input validation and bounds checking within the HID subsystem's parsing routines. The attacker, who must be authorized locally on the system, interacts with the vulnerable component by connecting a maliciously configured USB device or injecting crafted HID reports through other supported interfaces. Because the vulnerability is an out-of-bounds read rather than a write, it does not directly allow for arbitrary code execution in its immediate form. However, information disclosure vulnerabilities are frequently leveraged as part of larger attack chains to bypass security mitigations such as Address Space Layout Randomization (ASLR). By leaking memory addresses or cryptographic keys stored in adjacent regions, an attacker can gain the necessary intelligence to craft more sophisticated exploits that target other weaknesses within the system. This aligns with ATT&CK technique T1082, which covers System Information Discovery, specifically focusing on obtaining configuration data from local resources without triggering alarms through direct manipulation of executable code.
The operational impact of this vulnerability is primarily centered around confidentiality rather than integrity or availability in its initial stage. An authorized attacker can use the disclosed information to fingerprint the operating system version, identify loaded modules, and locate security mechanisms active within the kernel space. This reconnaissance phase significantly lowers the barrier for subsequent privilege escalation attacks. While the immediate effect is limited to local data disclosure, the long-term risk involves enabling remote code execution or full system compromise if combined with other vulnerabilities such as use-after-free conditions or integer overflows in related drivers. The requirement for an authorized attacker means that physical access to the machine or valid user credentials are prerequisites, which restricts the attack surface compared to network-based exploits but remains significant for devices used by high-value targets where physical security might be bypassed through social engineering or insider threats.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The primary defense is the deployment of vendor-provided patches that update the HID Parser Library with rigorous bounds checking logic. Developers should implement strict validation routines that verify all input lengths, report sizes, and field offsets against predefined limits before accessing memory buffers. Additionally, enabling compiler-based security features such as stack canaries, Data Execution Prevention (DEP), and ASLR helps mitigate the impact of information disclosure by making it harder for attackers to predict memory layouts. For system administrators, restricting physical USB port access through Group Policy or hardware locks reduces the attack surface against local HID injection attacks. Furthermore, adopting static analysis tools during software development can help identify similar out-of-bounds read patterns in other parts of the codebase before they reach production environments, ensuring a more robust security posture across all input handling subsystems.