CVE-2026-96247 in Windows
Summary
by MITRE • 10/15/2026
Use of uninitialized resource in Windows Kernel-Mode Drivers allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability described involves the improper initialization of resources within Microsoft Windows kernel-mode drivers, a critical component of the operating system that operates with high privileges and direct access to hardware and memory structures. This specific flaw falls under the category of CWE-457, which defines the use of an uninitialized variable or resource as a distinct weakness in software design and implementation. In this context, the driver fails to properly set initial values for certain data structures or pointers before they are utilized during normal system operations. Because kernel-mode code executes with Ring 0 privileges, any error in memory management can have severe consequences that extend far beyond the immediate process where the flaw resides.
When an authorized attacker interacts with a vulnerable component, such as through a specific API call or by triggering a particular driver routine, they can exploit this uninitialized state to read arbitrary portions of kernel memory. The lack of initialization means that the memory location may contain residual data from previous operations, which could include sensitive information such as cryptographic keys, session tokens, internal system pointers, or other confidential user data. This scenario aligns with ATT&CK technique T1008, known as Takedown: Current Operating System Maintenance, although in this specific instance, the primary impact is information disclosure rather than disruption of service. The attacker leverages the uninitialized resource to bypass standard security controls that rely on proper state management within the kernel.
The operational impact of this vulnerability is significant because it allows for local privilege escalation or sensitive data exfiltration without requiring remote access. Since the attack vector requires authorization, it typically targets users who already have some level of system access, such as service accounts or compromised user sessions with elevated permissions. The disclosure of kernel memory contents can facilitate further attacks by revealing addresses needed to bypass Address Space Layout Randomization (ASLR) or exposing credentials that allow persistence within the environment. This undermines the confidentiality and integrity guarantees provided by the operating system's security model.
Mitigation strategies for this vulnerability primarily involve applying the latest security updates released by Microsoft, which address the root cause by ensuring all resources are correctly initialized before use. System administrators should prioritize patching affected systems to close these information disclosure channels. Additionally, implementing strict access controls and monitoring for unusual memory read patterns can help detect exploitation attempts in real-time. Developers of third-party kernel drivers must also adhere to secure coding practices that mandate explicit initialization of all variables and resources to prevent similar weaknesses from being introduced into the system ecosystem.