CVE-2026-50393 in Windows
Summary
by MITRE • 07/14/2026
Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical use-after-free condition within Windows kernel-mode drivers that enables local privilege escalation for authenticated attackers. The flaw occurs when kernel-mode components fail to properly validate memory references after objects have been freed, creating opportunities for malicious code execution with elevated privileges. Such vulnerabilities typically arise from improper object lifecycle management where driver code continues to reference memory locations that have already been deallocated and potentially reallocated for different purposes.
The technical exploitation involves an attacker with standard user privileges who can trigger the vulnerable driver path through legitimate system calls or device interactions. When the kernel driver processes the malicious input, it executes code that references freed memory structures, allowing the attacker to manipulate the memory layout and potentially redirect execution flow to arbitrary code. This type of vulnerability falls under CWE-416 which specifically addresses use-after-free conditions in software systems. The attack vector typically leverages the Windows kernel's privilege escalation mechanisms where a user-mode process can influence kernel-mode operations through device ioctls or system calls.
From an operational perspective, this vulnerability poses significant risk as it requires minimal privileges for exploitation while offering maximum impact. Attackers can leverage this weakness to gain SYSTEM level access on vulnerable systems, potentially enabling further network reconnaissance, data exfiltration, or deployment of additional malware. The attack surface includes various kernel-mode drivers that process user input, making the exploit potential widespread across different Windows versions and hardware configurations. This type of vulnerability is particularly concerning because it operates at kernel level where standard operating system protections are bypassed.
Mitigation strategies for this vulnerability include immediate patch application from Microsoft security updates which typically address the underlying memory management issues in affected drivers. System administrators should implement the principle of least privilege by limiting user accounts to minimum required permissions and regularly auditing driver installations. Additionally, deployment of Windows Defender Application Control or similar kernel-mode protection mechanisms can help prevent exploitation attempts by blocking unauthorized code execution. Organizations should also consider implementing monitoring solutions that detect anomalous kernel-mode behavior patterns associated with use-after-free exploits. The vulnerability aligns with attack techniques documented in the MITRE ATT&CK framework under privilege escalation tactics, specifically targeting kernel exploitation methods that leverage memory corruption vulnerabilities to gain elevated system access.