CVE-2025-21319 in Windows
Summary
by MITRE • 01/14/2025
Windows Kernel Memory Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 06/19/2026
This vulnerability represents a critical information disclosure flaw within the windows kernel that allows unauthorized access to sensitive memory regions and system information. The vulnerability stems from improper handling of memory management operations where the kernel fails to adequately validate memory access permissions during certain system calls. Attackers can exploit this weakness to extract kernel memory contents including sensitive data structures, cryptographic keys, and system configuration information that should remain protected from user-mode applications. The flaw exists in the kernel's memory management subsystem and affects multiple windows versions including windows 10, windows 11, and various server editions. This vulnerability directly maps to cwe-200 information exposure and aligns with attack techniques described in the attack pattern taxonomy under information gathering and privilege escalation methods. The security implications are severe as this information disclosure can serve as a foundation for more sophisticated attacks including kernel exploitation and privilege escalation to system administrator level access.
The technical implementation of this vulnerability involves a race condition or improper memory access control during kernel memory allocation and deallocation processes. When certain system calls are executed, the kernel does not properly enforce memory access boundaries, allowing user-mode processes to read memory locations that contain sensitive kernel data. This typically occurs during memory mapping operations or when handling specific device io requests where the kernel fails to validate the requesting process's privileges before exposing memory contents. The flaw can be triggered through various api calls including device io control operations, memory management functions, or system information retrieval interfaces. The vulnerability demonstrates characteristics of cwe-125 out-of-bounds read and cwe-264 permissions, privileges, and access control issues that enable unauthorized data access. Attackers can leverage this vulnerability to perform memory scraping attacks, extract kernel addresses, or gather information about system internals that would normally be protected from user-mode access.
The operational impact of this vulnerability extends beyond simple information disclosure and can significantly compromise system security posture. Once exploited, attackers can gain detailed knowledge of kernel memory layout, which serves as a critical stepping stone for advanced exploitation techniques. The leaked memory information includes kernel pointers, data structure layouts, and potentially sensitive cryptographic material that can be used to bypass security mitigations like address space layout randomization and control flow integrity. This vulnerability enables attackers to perform advanced exploitation techniques such as kernel address leak attacks, which are commonly used in exploit development to bypass modern security protections. The information obtained can be used to construct more sophisticated attacks that target specific kernel memory regions or exploit other vulnerabilities within the kernel memory management subsystem. From a defensive perspective, this vulnerability represents a significant risk to enterprise environments where attackers could use the leaked information to develop targeted attacks against specific systems or to conduct advanced persistent threat operations.
Mitigation strategies for this vulnerability require a multi-layered approach combining system updates, access control enforcement, and monitoring capabilities. The primary defense mechanism involves applying microsoft security patches and updates that address the specific kernel memory management flaw. Organizations should prioritize patch deployment and implement automated update mechanisms to ensure systems remain protected against this vulnerability. Additionally, implementing strict access controls and privilege separation can limit the potential impact of exploitation attempts. The use of kernel isolation technologies, memory protection features, and advanced endpoint detection and response solutions can help detect and prevent exploitation attempts. Security teams should monitor for unusual memory access patterns and implement logging of kernel memory operations to identify potential exploitation attempts. Network segmentation and principle of least privilege enforcement can reduce the attack surface and limit the potential damage from successful exploitation. The vulnerability also highlights the importance of maintaining up-to-date security monitoring capabilities and ensuring that defensive measures are in place to detect memory-based attack patterns. Organizations should also consider implementing exploit prevention technologies that can detect and block known exploitation techniques targeting kernel memory management subsystems.