CVE-2026-50674 in Windows
Summary
by MITRE • 07/14/2026
Use after free in Windows USB Print Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical use-after-free flaw in the Windows USB print driver component that enables local privilege escalation for authenticated attackers. The issue stems from improper memory management within the print spooler service where freed memory blocks are still referenced after deallocation, creating opportunities for malicious code execution. The vulnerability exists in the handling of USB printer device communications and driver initialization processes, specifically affecting the Windows print subsystem's interaction with USB devices through the printer driver framework.
The technical implementation of this flaw involves the print driver's failure to properly validate or invalidate memory pointers during device enumeration and connection procedures. When a USB printer is connected or when print jobs are processed through USB interfaces, the driver allocates memory structures for device state management and communication buffers. During normal operation, these structures may be freed when a device disconnects or when processing completes, but subsequent operations attempt to access these already-freed memory regions. This creates a race condition scenario where an attacker can manipulate the timing to execute arbitrary code within the context of the print spooler service, which typically runs with elevated privileges.
From an operational perspective, this vulnerability provides attackers with a straightforward path to privilege escalation from standard user accounts to SYSTEM level access. The attack requires only local authentication and access to USB ports or printer sharing capabilities, making it particularly dangerous in enterprise environments where users may have legitimate access to shared printers. The print spooler service runs continuously and maintains persistent connections to print devices, providing consistent opportunities for exploitation. Additionally, the vulnerability affects multiple Windows versions including windows 10, windows server 2016, and windows server 2019, with varying degrees of impact across different system configurations.
The exploitability of this vulnerability aligns with several ATT&CK framework techniques including privilege escalation through service manipulation and process injection. The use-after-free condition can be leveraged to inject malicious code into the print spooler process, potentially enabling persistent access or lateral movement within a network. This vulnerability also maps to CWE-416 which specifically addresses use-after-free errors in memory management, and CWE-787 which covers out-of-bounds write conditions that may occur during exploitation of similar memory corruption flaws. Organizations should consider implementing mitigations such as disabling unnecessary printer services, restricting USB device access through group policy controls, and applying security patches immediately upon release.
Security controls for this vulnerability include enabling Windows Defender Application Control to restrict unauthorized driver loading and configuring the print spooler service with restricted permissions. Network segmentation can help limit exposure by preventing local users from accessing shared printers or USB ports. Regular monitoring of print spooler activity and unexpected process creation patterns should be implemented as part of intrusion detection systems. The vulnerability demonstrates how legacy components in operating systems can harbor critical security flaws, particularly in services that handle device communication with minimal input validation or memory safety checks. Organizations must maintain comprehensive patch management processes to address such vulnerabilities promptly, as the window for exploitation extends from initial disclosure through patch release and deployment across enterprise environments.
The broader implications extend beyond simple privilege escalation, as this vulnerability can serve as a foundation for more sophisticated attacks involving credential theft, persistence mechanisms, or data exfiltration. The print spooler service's interaction with various device drivers creates multiple potential attack vectors that attackers may leverage for additional compromise. This particular flaw highlights the importance of maintaining security in device driver code and the need for thorough memory safety validation in system-critical components. The vulnerability also underscores the challenges organizations face when managing legacy services that continue to operate with elevated privileges despite modern security requirements and the increasing sophistication of attack vectors targeting these persistent system components.