CVE-2026-61407 in Watchdog Timer Driver
Summary
by MITRE • 08/18/2026
Dell Watchdog Timer Driver versions prior to 2.0.0.1 contain an Exposed IOCTL with Insufficient Access Control vulnerability. A low privileged attacker with local access could potentially exploit this vulnerability, leading to Privilege Escalation.
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Analysis
by VulDB Data Team • 08/18/2026
The Dell Watchdog Timer Driver represents a critical component in the system management infrastructure of many Dell workstations and servers, responsible for monitoring system health and triggering resets if software hangs are detected. Versions prior to 2.0.0.1 contain a significant security flaw classified as an Exposed IOCTL with Insufficient Access Control vulnerability. This type of weakness arises when a device driver exposes input/output control codes that allow user-mode applications to interact directly with kernel-level resources without adequate verification of the caller's privileges or intent. In this specific instance, the driver fails to properly restrict access to certain internal functions, allowing any process running under low-privileged accounts to invoke these controls and manipulate hardware state in ways intended only for system administrators or trusted services.
From a technical perspective, the vulnerability stems from improper validation of security descriptors associated with the device object within the Windows kernel environment. When an application issues an IOCTL request, the operating system checks whether the caller has permission to access that specific control code. In vulnerable versions of the Dell Watchdog Timer Driver, this check is either missing or incorrectly configured, effectively leaving a backdoor into the kernel space accessible from user mode. This architectural flaw enables attackers with local account privileges to execute arbitrary commands within the context of the operating system's most privileged process, typically SYSTEM. The lack of access control means that standard users can bypass security boundaries designed to isolate untrusted code from critical system functions.
The operational impact of this vulnerability is severe due to its potential for privilege escalation. An attacker who gains local access to a vulnerable machine does not need elevated privileges initially; they only require a basic user account, which is often the default state in many enterprise environments or shared systems. By exploiting this flaw, an attacker can escalate their rights from a standard user to SYSTEM level. This grants them unrestricted read and write access to all files on the system, the ability to install rootkits, disable security software such as antivirus programs, create new administrative accounts, and exfiltrate sensitive data without detection. The ease of exploitation makes this a high-risk vector for initial compromise leading to full system takeover in targeted attacks or insider threats where physical or remote desktop access is available but elevated credentials are not yet possessed.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-284, which describes Improper Access Control, and specifically relates to the failure to enforce proper authorization checks on API calls. In terms of the MITRE ATT&CK framework, this flaw facilitates techniques associated with Privilege Escalation via kernel exploits or driver abuse, allowing adversaries to move laterally within a network after gaining initial foothold through other means such as phishing or unpatched web applications. The exploitation path typically involves crafting a malicious application that communicates directly with the device driver using specific IOCTL codes designed for system maintenance but misused here for unauthorized control.
Mitigation strategies primarily involve updating the Dell Watchdog Timer Driver to version 2.0.0.1 or later, where these access controls have been properly implemented and validated by Dell security teams. Organizations should prioritize patching this component across all endpoints running affected versions, particularly those exposed to untrusted users or located in less secure network segments. Additionally, implementing strict application whitelisting policies can prevent unauthorized executables from interacting with kernel drivers even if the vulnerability exists. Regular auditing of installed device drivers and monitoring for unusual IOCTL activity through endpoint detection and response tools can also help identify attempts to exploit this weakness before full compromise occurs. Ensuring that systems are maintained up-to-date with vendor-recommended security patches remains the most effective defense against such driver-level vulnerabilities.