CVE-2026-50479 in Windows
Summary
by MITRE • 07/14/2026
Untrusted pointer dereference in Windows USB Hub Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical privilege escalation flaw within the Windows USB Hub Driver component that enables authenticated local attackers to execute arbitrary code with elevated system privileges. The underlying issue stems from an untrusted pointer dereference condition that occurs when processing USB device enumeration and management operations. When a malicious user with standard account privileges interacts with USB devices through the kernel-level driver, the system fails to properly validate pointer references before dereferencing them, creating an exploitable memory access pattern.
The technical implementation of this vulnerability follows the common pattern described by CWE-468, which categorizes improper pointer type handling as a significant security risk. The Windows USB Hub Driver operates at kernel level with high privileges, making any flaw in its memory management particularly dangerous. During normal USB device operations, the driver receives input from user-mode applications through various system calls and dispatch interfaces. When processing malformed or unexpected USB device descriptors, the driver fails to perform adequate validation of pointer values, allowing an attacker to craft malicious device data that triggers the vulnerable code path.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete control over the target system. Once elevated to kernel-level privileges, an attacker can bypass all standard security controls including user access tokens, file system permissions, and application isolation mechanisms. This allows for persistent system compromise through rootkit installation, credential harvesting, and data exfiltration operations that would otherwise be blocked by normal security boundaries. The attack surface is particularly concerning given that USB devices are commonly connected to systems in various environments where users may not be security-aware.
The exploitation pattern aligns with ATT&CK technique T1068, which describes privilege escalation through kernel exploits, and specifically references the use of local system resources for unauthorized access. Attackers typically leverage this vulnerability by connecting specially crafted USB devices or by manipulating existing USB device drivers to trigger the pointer dereference condition. The exploit requires physical access to the target system or the ability to install malicious USB devices in trusted environments where USB ports are accessible. Mitigation strategies should include immediate deployment of Microsoft security patches, implementation of USB device whitelisting policies, and monitoring for unusual USB device enumeration patterns that might indicate exploitation attempts.
Security professionals should recognize this vulnerability as a classic example of kernel-mode memory corruption that can be exploited through user-mode input validation failures. The recommended defensive measures include maintaining current Windows updates, implementing Device Guard policies to restrict USB device access, and deploying endpoint detection and response solutions that can monitor for suspicious kernel-level activities. Organizations must also consider the broader implications of USB-based attacks and implement comprehensive security awareness training to prevent unauthorized device connections in sensitive environments where this vulnerability could be exploited for lateral movement or persistent access.