CVE-2026-58536
Summary
by MITRE • 07/14/2026
Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical use-after-free condition within the Windows Cloud Files Mini Filter Driver, which operates at the kernel level to manage file system operations for cloud storage integration. The flaw occurs when the driver fails to properly validate memory references after objects have been freed, creating opportunities for memory corruption that can be exploited by unauthorized users with local access privileges.
The technical implementation involves the mini filter driver's improper handling of resource cleanup operations during file system transactions. When certain file operations are performed through the cloud storage integration layer, the driver may release memory blocks while still maintaining references to them in subsequent processing paths. This creates a window where malicious code can manipulate the freed memory before it is overwritten, potentially allowing for arbitrary code execution within kernel space.
From an operational perspective this vulnerability presents significant risk as it requires only local authenticated access to exploit, making it particularly dangerous in environments where users may have legitimate administrative privileges. The attack vector typically involves crafting specific file operations that trigger the vulnerable code path, followed by memory manipulation techniques to achieve privilege escalation from standard user to SYSTEM level access. The exploitation process aligns with attack patterns documented in the ATT&CK framework under privilege escalation techniques, specifically targeting kernel-level vulnerabilities.
The impact of this vulnerability extends beyond simple local privilege escalation as it can enable attackers to bypass security controls, establish persistent access, and potentially move laterally within networks where cloud storage integration is deployed. Organizations running Windows systems with cloud file integration features are particularly vulnerable, especially in environments where user accounts have administrative privileges or where cloud storage services are configured with broad access permissions.
Mitigation strategies should focus on implementing immediate patch management protocols to address the underlying driver vulnerability while also employing additional security controls such as kernel mode code integrity checks and monitoring for suspicious memory manipulation patterns. System administrators should consider restricting local administrative privileges where possible and implement comprehensive endpoint protection solutions that can detect anomalous behavior in kernel space operations. The vulnerability demonstrates the importance of proper memory management practices in kernel-level components and aligns with CWE categories related to improper handling of memory resources, specifically CWE-416 which addresses use-after-free conditions. Organizations should also consider implementing network segmentation controls to limit the potential impact of successful exploitation attempts.
This particular vulnerability highlights the ongoing challenges in securing complex file system integration layers where multiple security contexts must be properly managed. The mini filter driver architecture creates additional attack surfaces that require careful validation of all input parameters and proper resource management throughout the entire operational lifecycle of file system operations. Security teams should monitor for indicators of compromise related to kernel memory manipulation and implement robust logging mechanisms to detect potential exploitation attempts against similar vulnerabilities in other driver components.