CVE-2026-50472 in Windows
Summary
by MITRE • 08/11/2026
Heap-based buffer overflow in Windows LUAFV allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/16/2026
A heap-based buffer overflow vulnerability exists within the Windows LUAFV component that enables authenticated attackers to achieve local privilege escalation. This flaw resides in the Lua File Virtualization subsystem which handles file virtualization operations for applications running under restricted contexts. The vulnerability stems from insufficient bounds checking when processing user-supplied data structures within heap memory allocations, creating opportunities for malicious code injection and memory corruption. The issue manifests when the system processes specially crafted input that exceeds allocated buffer boundaries, potentially allowing attackers to overwrite adjacent memory locations with controlled data.
The technical implementation of this vulnerability involves improper memory management practices where heap allocations do not adequately validate input lengths before copying data into fixed-size buffers. This condition creates a classic heap overflow scenario that can be exploited to manipulate critical system structures including function pointers, return addresses, or security-related metadata. The attacker must first establish a valid user session to leverage this vulnerability, as the flaw requires authenticated access to trigger the vulnerable code path within LUAFV. The attack vector typically involves crafting malicious input files or registry entries that when processed by the virtualization subsystem, cause the buffer overflow condition to occur.
The operational impact of this privilege escalation vulnerability extends beyond simple local code execution, as successful exploitation can grant attackers SYSTEM-level privileges on affected Windows systems. This elevated access enables comprehensive system compromise including modification of critical security policies, installation of persistent backdoors, data exfiltration, and further lateral movement within network environments. The vulnerability affects multiple Windows versions including server and desktop operating systems, making it particularly concerning for enterprise environments where administrative accounts may be present. Security researchers have identified this flaw as aligning with CWE-121 heap-based buffer overflow conditions and potentially mapping to ATT&CK technique T1068 for local privilege escalation.
Mitigation strategies should prioritize immediate patch deployment from Microsoft security updates which address the underlying memory handling flaws in LUAFV components. Organizations should also implement additional defensive measures including enabling Windows Defender Application Control policies, restricting user privileges through least-privilege principles, and monitoring for suspicious file virtualization activities. System administrators should consider disabling unnecessary file virtualization features when they are not required for specific applications, as this reduces the attack surface available to potential exploiters. Network segmentation and endpoint detection systems can help identify exploitation attempts by monitoring for anomalous memory access patterns or privilege escalation behaviors that may indicate successful exploitation of this vulnerability.