CVE-2026-83852 in Windows
Summary
by MITRE • 10/14/2026
Use after free in Windows Bind Filter Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability described involves a use-after-free condition within the Windows Bind Filter Driver, a component responsible for managing network binding and filtering operations on Microsoft Windows operating systems. This specific flaw arises when the driver fails to properly manage memory allocation and deallocation cycles during its processing of network packet data or filter attachment requests. Specifically, after a block of memory is freed by the system due to an operation completion or cancellation, the driver retains a dangling pointer that references this now-invalid memory location. If subsequent operations attempt to access or modify data through this stale pointer before it has been nullified or reallocated for another purpose, the application logic proceeds with corrupted state information. This scenario creates a classic use-after-free vulnerability where the integrity of system memory is compromised because the driver interacts with resources that are no longer validly owned by the process context.
From an operational perspective, this flaw allows an authorized attacker to achieve local privilege escalation on the affected Windows host. Because the Bind Filter Driver operates at a high level within the kernel mode execution environment, any exploitation of this memory corruption can lead to arbitrary code execution with SYSTEM-level privileges. An attacker who has already gained authenticated access to the system, even through standard user credentials, can craft specific network requests or trigger specific driver states that induce the use-after-free condition. By carefully controlling the contents of the freed memory region before it is accessed again, typically by allocating new objects with predictable layouts, the attacker can redirect execution flow to inject and execute malicious shellcode. This effectively bypasses standard user-level security boundaries, granting full control over the operating system kernel.
The technical classification of this vulnerability aligns closely with CWE-416, which defines use-after-free errors as a category of memory safety issues where software continues to use a pointer after it has been freed. In the context of modern exploit mitigation techniques such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR), exploiting this vulnerability requires precise heap grooming or information leakage primitives to bypass these protections. The attack vector is primarily local, meaning physical access or remote code execution capabilities are not required for initial exploitation; however, the attacker must possess valid credentials on the target machine. This places the threat level high in terms of impact but moderate in terms of accessibility compared to remotely exploitable flaws.
In relation to industry frameworks, this vulnerability can be mapped to MITRE ATT&CK technique T1068, which covers Exploitation for Privilege Escalation. The specific method employed falls under sub-techniques involving kernel exploitation or driver vulnerabilities. Security analysts should note that such vulnerabilities often require sophisticated payload construction and may depend on the specific version of Windows and the current state of system memory to succeed reliably. Defense in depth strategies are critical here, as single-layer defenses like antivirus software may not detect low-level kernel exploits until they manifest as suspicious process behavior.
To mitigate this risk, organizations must ensure that all affected systems have applied the latest security patches released by Microsoft for their respective Windows versions. The Bind Filter Driver is a core component of the operating system, and updates addressing memory management flaws are typically distributed through standard Windows Update channels or out-of-band security bulletins depending on severity. Administrators should prioritize patching servers and workstations that handle sensitive data or serve as jump hosts within internal networks. Additionally, implementing strict application whitelisting policies can help prevent unauthorized execution of malicious payloads even if the privilege escalation is successfully achieved. Regular auditing of driver installations and monitoring for unusual kernel-mode activity using advanced endpoint detection and response tools further reduces the attack surface associated with such low-level vulnerabilities.