CVE-2026-96250 in Windows
Summary
by MITRE • 10/14/2026
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 • 10/14/2026
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 class of memory corruption error occurs when the software continues to use pointers that point to deallocated or freed memory regions, leading to unpredictable behavior and potential exploitation by malicious actors. In this context, the flaw resides in how the USB print driver manages object lifecycles during device enumeration or data transfer operations. When a USB printing device is connected or disconnected, or when specific print jobs are processed, the driver may release certain kernel-mode objects but fail to nullify the corresponding pointers held by other parts of the system. If an attacker can trigger these conditions through crafted input or specific hardware interactions, they can cause the system to reference memory that has already been returned to the pool for reuse.
From a technical perspective, use-after-free vulnerabilities are particularly dangerous because they allow attackers to control what data is written into the freed memory region before it is reallocated and accessed again. By carefully crafting malicious USB descriptors or print job payloads, an attacker can manipulate the contents of this freed memory block. When the vulnerable code subsequently accesses these pointers, it may execute arbitrary code within the context of the operating system kernel. This capability effectively bypasses standard user-mode security boundaries, as the driver operates with high privileges in Ring 0. The exploitation typically involves overwriting function pointers or object headers to redirect execution flow to shellcode placed by the attacker, thereby achieving remote code execution capabilities that are subsequently leveraged for local privilege escalation.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation. An authorized attacker who has already gained access to a vulnerable Windows system can exploit this flaw to gain SYSTEM-level privileges or equivalent administrative rights. This transformation from standard user context to kernel-level execution allows the attacker to install programs, view, change, or delete arbitrary data, and create new accounts with full control permissions. Once such elevated privileges are obtained, the security of the entire host is compromised, as the attacker can disable security software, exfiltrate sensitive information, and use the machine as a pivot point for further attacks within the network infrastructure. The presence of this flaw in core system components like USB drivers means that physical access to the device or the ability to connect malicious peripherals could serve as an initial attack vector, significantly expanding the threat surface beyond traditional network-based exploits.
Mitigation strategies primarily involve applying official security updates provided by Microsoft that patch the underlying memory management logic within the affected driver versions. Organizations should ensure that all Windows systems are kept up-to-date with the latest cumulative patches to close this specific gap in kernel-mode validation and resource handling. In environments where immediate patching is not feasible, administrators can implement mitigations such as disabling unused USB ports or restricting physical access to workstations to prevent unauthorized device connections. Additionally, deploying endpoint detection and response solutions that monitor for anomalous driver behavior or memory corruption events can help detect exploitation attempts in real-time. Adhering to the principle of least privilege by limiting user accounts' ability to install drivers or connect arbitrary hardware also reduces the risk surface associated with this vulnerability.
This flaw aligns with Common Weakness Enumeration (CWE) identifier CWE-416, which defines use-after-free errors as a distinct category of memory safety violations. From an offensive security perspective, such exploitation techniques are often categorized under MITRE ATT&CK framework tactics related to privilege escalation and defense evasion, specifically involving kernel-mode exploits or driver manipulation. Understanding these mappings helps security teams prioritize remediation efforts based on standardized risk classifications and known adversary behaviors. The persistence of this vulnerability highlights the critical importance of rigorous code review processes for low-level system drivers, where memory management errors can have catastrophic consequences for overall system integrity and confidentiality.