CVE-2026-96253 in Windows
Summary
by MITRE • 10/15/2026
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 • 10/15/2026
The vulnerability described involves a use-after-free condition within the Universal Serial Bus (USB) print driver subsystem of Microsoft Windows operating systems. This specific flaw arises from improper memory management practices where the software continues to reference a block of memory after it has been freed or deallocated by the system. In the context of kernel-mode drivers, such as those handling USB printing devices, this error can lead to significant security implications because these components operate with high privileges and direct access to critical system resources. The root cause typically stems from race conditions or logic errors where a pointer is not properly nullified after memory release, allowing subsequent operations to interact with stale data that may have been reallocated for other purposes.
From an operational perspective, this vulnerability allows an authorized attacker who has already gained local execution capabilities on the target system to escalate privileges to those of the SYSTEM account or kernel level. The attack vector requires physical proximity to the victim machine if it involves plugging in a malicious USB device that triggers the vulnerable code path during initialization or data transfer processes. Alternatively, if the driver is accessible via networked printing services, remote exploitation might be possible depending on specific configurations and patch levels. Once triggered, the attacker can manipulate the dangling pointer to execute arbitrary code within the kernel space, effectively bypassing standard security boundaries such as User Account Control (UAC) and mandatory access controls that rely on user-level isolation.
This type of flaw is commonly categorized under CWE-416: Use After Free in the Common Weakness Enumeration framework. It aligns with MITRE ATT&CK techniques related to privilege escalation, specifically those involving exploitation of driver vulnerabilities or kernel memory corruption. The impact extends beyond simple access control bypass; it can lead to complete system compromise, including data exfiltration, installation of persistent backdoors, and lateral movement within a networked environment. Attackers often leverage such vulnerabilities in zero-day campaigns targeting enterprise environments where USB printing is enabled but security patches are delayed or misconfigured.
Mitigation strategies primarily involve applying the latest cumulative updates provided by Microsoft that address memory management issues within the USB print driver stack. Administrators should ensure that all systems connected to potentially untrusted networks or physical ports have up-to-date firmware and OS patches. Additionally, implementing strict device control policies through Group Policy can restrict which USB devices are allowed to connect to corporate endpoints, thereby reducing the attack surface for physical access attacks. Enabling kernel DMA protection where supported by hardware can also mitigate risks associated with direct memory access from peripheral devices. Regular auditing of driver installations and disabling unnecessary print services on workstations further reduces exposure to this class of vulnerabilities.