CVE-2026-96865 in Windows
Summary
by MITRE • 10/15/2026
Exposure of sensitive system information to an unauthorized control sphere in Windows Secure Kernel Mode allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability described involves a critical flaw within the Microsoft Windows Secure Kernel, specifically related to how it handles access controls for sensitive system information. This component operates at Ring 0, the highest privilege level on x86 architectures, where it manages core security functions such as credential validation and secure boot processes. The specific defect allows an attacker who has already gained authorized local execution privileges to bypass intended restrictions and read memory or data structures that are meant to be isolated from standard user-mode applications. This represents a failure in the principle of least privilege within the kernel's internal logic, where state information is exposed beyond its designated security boundary despite the presence of access control mechanisms designed to prevent such disclosure.
From a technical perspective, this issue falls under the category of Improper Access Control, specifically mapped to CWE-269: Improvement of Privileges or CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. The flaw likely stems from insufficient validation checks within the kernel-mode driver code that handles secure context switching or credential storage. When a process with valid authentication credentials attempts to interact with these protected subsystems, the system fails to correctly verify whether the specific operation is permitted for that user's privilege level. Consequently, sensitive data such as session tokens, cryptographic keys, or internal state variables can be retrieved by the attacker through carefully crafted API calls or memory read operations that exploit this oversight in the access control logic.
The operational impact of this vulnerability is significant because it facilitates local information disclosure which serves as a critical enabler for further exploitation. While an authorized attacker already possesses some level of system access, gaining visibility into kernel-level secrets can allow them to escalate privileges to SYSTEM or domain administrator levels by extracting credentials stored in memory. It also compromises the integrity of secure boot processes and other security features that rely on the confidentiality of internal state information. This exposure undermines trust in the operating system's ability to protect sensitive data even from authenticated users, potentially leading to full system compromise if combined with other local exploitation techniques such as kernel code execution or driver injection attacks.
In terms of threat modeling, this vulnerability aligns with MITRE ATT&CK technique T1003: OS Credential Dumping and T1528: Steal Application Access Tokens. Attackers can leverage the exposed information to harvest credentials for lateral movement within a network environment or to maintain persistent access by stealing session tokens that do not require re-authentication. The ability to read secure kernel memory effectively neutralizes many of the defensive measures implemented in modern Windows versions, as it allows adversaries to bypass user account control prompts and security assertions made by applications running under restricted privileges.
Mitigation strategies primarily involve applying the latest cumulative updates provided by Microsoft, which address these access control flaws within the Secure Kernel component. Organizations should ensure that all endpoints are patched promptly upon release of relevant security advisories. Additionally, implementing strict application whitelisting policies can limit the ability of unauthorized or malicious software to execute code with sufficient privileges to probe kernel memory structures. Network segmentation and monitoring for anomalous local privilege escalation attempts can also help detect exploitation activities in real-time, although prevention through patching remains the most effective defense against this class of vulnerability.