CVE-2025-30101 is a time-of-check to time-of-use (TOCTOU) race condition vulnerability identified in Dell PowerScale OneFS versions 9.8.0.0 through 9.10.1.0. This vulnerability arises when the system performs a security check on a resource or condition and then uses that resource or condition later, without ensuring that it has not changed in the interim. Specifically, an attacker with local access but without authentication privileges can exploit this race condition to manipulate the timing between the check and the use of a resource, potentially causing denial of service (DoS) or tampering with information. The vulnerability is classified under CWE-367, indicating a TOCTOU race condition. The CVSS 3.1 base score is 4.4 (medium severity), with vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L, meaning the attack requires local access and low privileges, no user interaction, and impacts integrity and availability but not confidentiality. No known exploits are currently in the wild, and no patches have been linked yet. The vulnerability affects Dell PowerScale OneFS, a clustered file system used primarily in enterprise storage solutions, which is critical for managing large-scale data storage environments. Exploitation could disrupt storage availability or corrupt data integrity, impacting business operations relying on these systems.

For European organizations, the impact of this vulnerability could be significant, especially for enterprises and service providers relying on Dell PowerScale OneFS for critical data storage and management. A successful exploitation could lead to denial of service, causing downtime in storage availability, which may disrupt business continuity, data processing, and access to critical information. Information tampering could undermine data integrity, leading to corrupted files or inaccurate data, potentially affecting compliance with data protection regulations such as GDPR. Organizations in sectors like finance, healthcare, telecommunications, and government, which often use high-performance storage solutions, could face operational disruptions and reputational damage. Although exploitation requires local access with low privileges, insider threats or attackers who gain initial footholds in the network could leverage this vulnerability to escalate impact. The medium severity rating suggests a moderate risk but should not be underestimated given the critical nature of storage infrastructure.

To mitigate this vulnerability, European organizations should prioritize the following actions: 1) Restrict local access to Dell PowerScale OneFS systems strictly to trusted and authorized personnel, employing strong access controls and monitoring to detect unauthorized presence. 2) Implement network segmentation and isolation for storage clusters to limit exposure and reduce the risk of lateral movement by attackers. 3) Monitor system logs and behavior for signs of race condition exploitation attempts or unusual activity indicative of timing attacks. 4) Apply principle of least privilege rigorously to minimize the privileges of local users, reducing the potential impact of exploitation. 5) Engage with Dell support channels to obtain and deploy patches or updates as soon as they become available, and subscribe to vendor advisories for timely information. 6) Conduct regular security audits and penetration testing focused on local access controls and race condition vulnerabilities. 7) Consider deploying runtime application self-protection (RASP) or host-based intrusion detection systems (HIDS) that can detect and prevent race condition exploitation patterns. These measures go beyond generic advice by focusing on access control hardening, monitoring, and proactive vendor engagement specific to this vulnerability's characteristics.