CVE-2026-56797 in Command Update
Summary
by MITRE • 08/19/2026
Dell Command Update (DCU), versions prior to 5.7.1, a Time-of-check Time-of-use (TOCTOU) Race Condition 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 • 08/19/2026
The Dell Command Update utility serves as a critical component in enterprise IT infrastructure, responsible for managing and deploying firmware and driver updates across Dell systems. In versions prior to 5.7.1, the application contains a significant security flaw classified as a Time-of-check Time-of-use race condition vulnerability. This type of vulnerability arises when there is an inconsistency between the time at which a system checks a resource or permission and the actual time it uses that resource. Specifically, in this context, Dell Command Update fails to properly secure its update installation process against concurrent access attempts by multiple processes or users operating with different privilege levels.
From a technical perspective, the core of this vulnerability lies in how the application handles file system operations during the update deployment phase. The software likely performs a security check on an executable or configuration file before proceeding with modification or execution but does not maintain exclusive control over that resource until it is actually used. This gap creates a window of opportunity where a low-privileged attacker, who already has local access to the operating system, can manipulate the target files between the initial verification and the subsequent usage. By exploiting this race condition, an attacker can substitute legitimate update components with malicious payloads or alter permissions in ways that bypass standard security controls.
The operational impact of this vulnerability is severe due to its potential for privilege escalation. Although exploitation requires local access and low privileges initially, successful exploitation allows the attacker to execute code with elevated system-level rights. This effectively transforms a minor breach into a critical compromise, granting the adversary full control over the affected Dell device. Such elevation enables further lateral movement within a network, persistence through rootkit installation, or exfiltration of sensitive data that would otherwise be protected by standard user-level restrictions. The presence of this flaw undermines the integrity of the update mechanism itself, as attackers can potentially inject malicious firmware or drivers under the guise of legitimate system updates.
This vulnerability aligns with CWE-367, which defines Time-of-check Time-of-use (TOCTOU) race conditions in software security contexts. It also maps to MITRE ATT&CK techniques related to privilege escalation and defense evasion, specifically those involving manipulation of file permissions or execution flow during installation processes. The attack vector is classified as local with low complexity but requires physical or remote desktop access initially, highlighting the importance of strict endpoint protection policies even for trusted applications like system utilities.
To mitigate this risk, organizations must prioritize patching Dell Command Update to version 5.7.1 or later immediately upon availability. This updated release addresses the race condition by implementing proper synchronization mechanisms and ensuring atomic operations during file modifications. Additionally, administrators should enforce least-privilege principles for local user accounts on managed devices to reduce the attack surface available to potential exploiters. Implementing application whitelisting policies can further restrict unauthorized execution of modified binaries within system directories. Regular auditing of update logs and monitoring for anomalous permission changes in critical system folders will also aid in detecting any attempted exploitation activities before they result in full compromise.