CVE-2026-21422 in PowerScale OneFS
Summary
by MITRE • 03/04/2026
Dell PowerScale OneFS, versions 9.10.0.0 through 9.13.1.0, contains an external control of system or configuration setting vulnerability. A high privileged attacker with local access could potentially exploit this vulnerability, leading to protection mechanism bypass.
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Analysis
by VulDB Data Team • 05/05/2026
The vulnerability identified as CVE-2026-21422 affects Dell PowerScale OneFS storage systems across specific version ranges, creating a critical exposure in system configuration management. This issue manifests as an external control of system or configuration setting vulnerability that allows unauthorized modification of critical system parameters. The flaw exists within the storage operating system's architecture where external entities can manipulate system settings that should remain protected from unauthorized access. The vulnerability is particularly concerning because it requires only local access from a high privileged attacker, meaning that an adversary who has already gained some level of system access can leverage this weakness to bypass existing protection mechanisms.
The technical nature of this vulnerability aligns with CWE-502, which describes external control of system or configuration setting flaws where an attacker can influence system behavior through external inputs or controls. In the context of Dell PowerScale OneFS, this weakness allows an attacker to manipulate configuration parameters that govern system security policies, access controls, and operational behaviors. The vulnerability operates at the system configuration level, potentially enabling attackers to disable security features, modify access controls, or alter system behavior in ways that could compromise the integrity and availability of the storage environment. This type of flaw represents a significant bypass opportunity within the security architecture, as it allows attackers to circumvent established protection mechanisms that should otherwise prevent unauthorized system modifications.
The operational impact of this vulnerability extends beyond simple configuration changes, as it can lead to complete compromise of the storage system's security posture. A successful exploitation could allow an attacker to gain persistent access to sensitive data, modify storage policies, or disable critical security features that protect against unauthorized access. The affected version ranges indicate that multiple releases within the 9.10 and 9.11 series are vulnerable, suggesting this represents a widespread issue affecting Dell PowerScale deployments. Organizations utilizing these storage systems face potential exposure to data breaches, unauthorized data access, and system compromise that could affect thousands of storage volumes and petabytes of data. The vulnerability's impact is amplified by the fact that it requires only local access, meaning that attackers who have already established a foothold on the system can escalate their privileges and bypass protection mechanisms.
Mitigation strategies for this vulnerability should focus on immediate patching of affected systems, implementation of network segmentation, and enhanced monitoring of system configuration changes. Organizations should prioritize updating to the latest available versions of Dell PowerScale OneFS that contain fixes for this vulnerability, as these releases typically include enhanced controls over system configuration modifications. Network segmentation can help limit the attack surface by restricting local access to critical system components, while comprehensive monitoring of configuration changes can help detect unauthorized modifications. Additionally, implementing principle of least privilege access controls and regular security assessments can help identify and remediate similar vulnerabilities before they can be exploited. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques, where attackers leverage system configuration weaknesses to bypass security controls and gain elevated privileges within the system environment.