CVE-2026-69798 in Windows
Summary
by MITRE • 10/14/2026
Use after free in Windows Wired AutoConfig Service allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified within the Windows Wired AutoConfig service represents a critical memory management flaw classified as a use-after-free error. This specific type of defect occurs when software continues to reference a pointer after the memory it points to has been freed or deallocated by another part of the system. In this context, the wired network configuration component fails to properly manage the lifecycle of certain data structures during authentication and connection establishment processes. When an application or service releases memory associated with these structures but retains references to them for subsequent operations, those references become dangling pointers. If the operating system reallocates that freed memory block to a different object before the original reference is cleared, any operation performed through the stale pointer will interact with the new data rather than the intended target. This discrepancy creates an opportunity for an attacker to manipulate program flow or access sensitive information by controlling what gets allocated in the reclaimed memory space.
From a technical perspective, this flaw allows an authenticated local user to escalate privileges on the affected Windows system. The Wired AutoConfig service is responsible for managing wired network connections and typically runs with elevated permissions to configure network interfaces and apply security policies. By exploiting the use-after-free condition, an attacker can achieve arbitrary code execution within the context of this high-privilege process. This effectively bypasses standard user account control mechanisms because the malicious payload executes as a trusted system service rather than under the limited rights of the logged-in user. The exploitation chain generally involves triggering the memory deallocation through specific network configuration requests, followed by carefully crafted heap spraying or allocation techniques to place shellcode in the newly allocated memory block that overwrites the stale pointer's target data structure.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation. Once an attacker gains a foothold on the system as a standard user, they can leverage this flaw to obtain SYSTEM-level access. This level of control grants unrestricted read and write access to all files, registry keys, and running processes on the machine. It enables the installation of persistent backdoors, theft of sensitive credentials stored in memory or on disk, and further lateral movement within an enterprise network if the compromised host serves as a pivot point. The existence of such a vulnerability undermines the principle of least privilege that is fundamental to secure system architecture, allowing low-privileged accounts to compromise the integrity and confidentiality of the entire operating environment.
Mitigation strategies primarily involve applying vendor-provided security patches that address the memory management logic within the Wired AutoConfig service. These updates typically include checks to ensure pointers are nullified immediately after memory release or implement safeguards against double-free conditions. In environments where patching is not immediately feasible, administrators should restrict local login privileges for non-essential accounts and enforce strict application whitelisting policies using tools like Windows Defender Application Control or AppLocker. Additionally, monitoring for unusual process creation events originating from network configuration services can help detect exploitation attempts in real time. Regular vulnerability scanning and adherence to CIS benchmarks for hardening Windows systems further reduce the attack surface associated with such memory corruption vulnerabilities.