CVE-2026-40717 in Monitor driver
Summary
by MITRE • 08/03/2026
Dell Monitor driver, version 1.0.0.0, contains an Improper Link Resolution Before File Access ('Link Following') vulnerability. A low privileged attacker with local access could potentially exploit this vulnerability, leading to Elevation of Privileges.
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Analysis
by VulDB Data Team • 08/03/2026
This vulnerability resides within the Dell Monitor driver version 1.0.0.0 and represents a critical improper link resolution before file access issue that falls under CWE-384, which specifically addresses the dangerous practice of following symbolic links without proper validation. The flaw occurs when the driver processes symbolic links or file references during its normal operation, failing to properly resolve these links before attempting file access operations. This creates an opportunity for malicious actors to manipulate the link resolution process and potentially gain unauthorized access to system resources.
The technical implementation of this vulnerability stems from inadequate input validation within the driver's file handling routines where it accepts symbolic links or path references without sufficient verification of their legitimacy. When a low privileged local user executes malicious actions that trigger the driver's processing of these improper links, the system may follow unintended paths that lead to elevated privilege execution. This represents a classic attack vector that aligns with ATT&CK technique T1068 which covers 'Local Privilege Escalation' through improper link resolution mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation as it creates a persistent threat vector that requires careful system monitoring and access control implementation. An attacker who successfully exploits this vulnerability could potentially execute arbitrary code with elevated privileges, access restricted system files, modify critical driver components, or establish persistence mechanisms within the target environment. The low privilege requirement makes this particularly dangerous as it can be exploited by users who normally have minimal system access rights.
Mitigation strategies should include immediate driver updates from Dell to address the specific link resolution implementation flaws and ensure proper symbolic link validation is enforced. System administrators should implement strict file access controls and monitor for unusual symbolic link creation or modification patterns within the driver installation directories. Additionally, regular security assessments should verify that no unauthorized symbolic links exist in critical system paths and that proper access control lists are maintained to prevent unauthorized privilege escalation attempts. The vulnerability also highlights the importance of implementing principle of least privilege enforcement and maintaining up-to-date driver versions across all monitored systems.
This issue demonstrates the critical importance of proper path resolution validation in device drivers, particularly those with elevated system privileges. The vulnerability serves as a reminder that even seemingly minor implementation flaws in driver code can create significant security risks when exploited by determined attackers. Organizations should consider implementing additional monitoring solutions specifically designed to detect improper link resolution activities and maintain regular patch management processes to address such vulnerabilities promptly.