CVE-2025-21318 in Windows
Summary
by MITRE • 01/14/2025
Windows Kernel Memory Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 06/18/2026
This vulnerability represents a critical information disclosure flaw within the windows kernel that allows unauthorized access to sensitive memory contents. The issue stems from improper handling of memory management operations where the kernel fails to adequately protect privileged memory regions from user-mode processes. When exploited, this vulnerability enables attackers to extract kernel memory addresses, system structures, and potentially sensitive data that should remain protected within the operating system's privileged execution environment. The flaw typically manifests through improper validation of memory access requests or insufficient boundary checking during kernel operations, creating pathways for information leakage that can be leveraged in subsequent attack phases.
The technical implementation of this vulnerability involves the exploitation of memory management subsystems where kernel functions fail to properly enforce access controls. Attackers can craft specific memory access patterns or utilize existing kernel APIs in ways that bypass normal security boundaries. This often occurs through kernel-mode drivers or system calls that do not adequately validate input parameters or maintain proper memory isolation. The vulnerability may be triggered through various attack vectors including driver interactions, system service calls, or specific memory allocation patterns that cause the kernel to expose memory contents that should remain confidential. The flaw typically aligns with common weakness enumerations such as cwe-200 information exposure and cwe-264 privilege escalation through improper access control mechanisms.
The operational impact of this vulnerability extends beyond simple information disclosure to enable sophisticated attack chains that can lead to complete system compromise. Once an attacker gains access to kernel memory information, they can utilize this intelligence to bypass exploit mitigations such as address space layout randomization and kernel address space randomization. The leaked memory contents can reveal kernel base addresses, function pointers, and system structure layouts that significantly aid in developing more effective exploits. This information disclosure serves as a crucial stepping stone for advanced persistent threats, allowing attackers to craft more precise and reliable attacks against the target system. The vulnerability can also facilitate the discovery of additional system weaknesses and provide insights into kernel implementation details that can be exploited in combination with other vulnerabilities.
Mitigation strategies for this vulnerability require comprehensive system hardening measures that address both immediate protection and long-term security improvements. System administrators should implement the latest security patches and updates from microsoft to address the specific kernel memory handling flaws. Additional protective measures include enabling kernel address space layout randomization, implementing strict driver signing requirements, and configuring memory protection mechanisms such as data execution prevention. Organizations should also deploy intrusion detection systems that can monitor for suspicious memory access patterns and unusual kernel behavior. The implementation of principle of least privilege and regular security assessments can help reduce the attack surface and limit the potential impact of exploitation attempts. Security teams should also consider implementing advanced monitoring solutions that can detect anomalous memory access behaviors indicative of information disclosure attacks, aligning with defense-in-depth strategies outlined in nist cybersecurity framework and corresponding attack techniques documented in the mitre att&ck framework under information gathering and privilege escalation categories.