CVE-2026-61927 in Windows
Summary
by MITRE • 08/11/2026
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 • 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 or manage memory references after objects have been freed, creating opportunities for malicious code execution in kernel space. Such vulnerabilities typically arise from inadequate memory management practices where pointers remain accessible even after their associated memory has been deallocated, allowing attackers to manipulate data structures and potentially execute arbitrary code with system-level privileges.
The technical implementation of this vulnerability stems from improper handling of kernel-mode memory allocations within the bind filter driver's object lifecycle management. When legitimate operations occur that trigger memory deallocation, the driver does not adequately nullify or invalidate references to freed objects, creating a window where attacker-controlled data can be written to previously freed memory locations. This condition aligns with common software security weaknesses documented in CWE-416, which specifically addresses use-after-free vulnerabilities in memory management. The attack vector requires local authentication since the vulnerability exists within kernel-mode drivers that are accessible only through legitimate system operations.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially compromise entire system integrity and confidentiality. An authenticated user with low privileges can exploit this condition to gain SYSTEM-level access, enabling them to bypass security controls, modify critical system files, install malicious software, or establish persistent backdoors. The attack typically involves crafting specific input that triggers the vulnerable code path in the bind filter driver, followed by exploitation of the use-after-free condition to overwrite kernel memory structures with malicious payloads. This scenario demonstrates how seemingly minor memory management flaws can result in catastrophic security consequences.
Mitigation strategies for this vulnerability should encompass multiple defensive layers including immediate patch deployment from Microsoft, which addresses the underlying memory management issues in the bind filter driver component. System administrators should implement least privilege principles by restricting user accounts to minimum required permissions and monitoring for unusual kernel-mode activity. Additionally, exploit protection mechanisms such as address space layout randomization, data execution prevention, and kernel address space layout randomization can help complicate exploitation attempts. Organizations should also consider implementing security monitoring solutions that detect anomalous behavior in kernel drivers and establish incident response procedures specifically addressing local privilege escalation attacks. The vulnerability's classification under ATT&CK technique T1068 suggests it may be leveraged as part of broader attack chains involving privilege escalation and lateral movement within compromised environments.