CVE-2026-61934 in Windows
Summary
by MITRE • 08/11/2026
Use after free in Windows Bind Filter Driver allows an authorized attacker to elevate privileges locally.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical use-after-free condition within the Windows Bind Filter Driver component that enables local privilege escalation for authenticated attackers. The flaw occurs when the driver fails to properly validate memory references after objects have been freed, creating opportunities for malicious code execution with elevated privileges. The vulnerability stems from improper handling of kernel-mode memory management operations within the filter driver's object lifecycle management, specifically during cleanup routines where freed memory structures remain accessible to subsequent operations.
The technical implementation involves the bind filter driver maintaining references to kernel objects that are prematurely deallocated while still being referenced by active processes or threads. When an attacker successfully triggers this condition through legitimate system calls or driver interactions, the use-after-free allows arbitrary code execution within kernel space with SYSTEM privileges. This occurs because the freed memory can be reallocated and manipulated by the attacker to redirect execution flow or inject malicious code into the kernel address space.
From an operational perspective, this vulnerability provides attackers with a straightforward path to privilege escalation without requiring external network access or complex exploitation techniques. The local nature of the attack means that any authenticated user account on the system can potentially leverage this flaw, making it particularly dangerous in multi-user environments or when users have legitimate administrative access. The attack vector typically involves crafting specific driver IOCTL calls or file system operations that trigger the memory management race condition, followed by careful exploitation of the freed memory layout.
The impact extends beyond simple privilege escalation as this vulnerability can be leveraged to establish persistent backdoors, disable security mechanisms, or extract sensitive system information. Attackers may use the elevated privileges to modify system files, install rootkits, or access encrypted data that would otherwise require administrative credentials. This type of vulnerability aligns with CWE-416 which specifically addresses use-after-free conditions in memory management, and maps to ATT&CK technique T1068 which covers local privilege escalation through kernel exploits.
Mitigation strategies should focus on immediate patch deployment from Microsoft security updates, which address the underlying memory management flaw in the bind filter driver implementation. System administrators should implement least privilege principles and disable unnecessary driver functionality where possible. Additional protective measures include enabling kernel-mode code integrity checks, implementing driver signature enforcement, and monitoring for suspicious kernel-level activity patterns that may indicate exploitation attempts. Regular system hardening practices including disabling unused services and maintaining updated security baselines will further reduce the attack surface and potential impact of this vulnerability.