CVE-2026-22281
📋 TL;DR
A Time-of-check Time-of-use (TOCTOU) race condition vulnerability in Dell PowerScale OneFS allows low-privileged attackers with adjacent network access to potentially cause denial of service. This affects multiple versions of Dell PowerScale OneFS storage systems. Attackers need to be on the same network segment as the vulnerable system.
💻 Affected Systems
- Dell PowerScale OneFS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system unavailability or crash of the PowerScale OneFS storage system, disrupting all storage services and data access.
Likely Case
Partial service disruption or performance degradation affecting specific storage operations or nodes.
If Mitigated
Minimal impact if network segmentation prevents adjacent access and proper monitoring detects anomalous activity.
🎯 Exploit Status
Requires low privileged credentials and adjacent network access. TOCTOU race conditions typically require precise timing and multiple attempts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to OneFS 9.5.1.6+, 9.7.1.11+, 9.10.1.4+, or 9.13.0.0+ as appropriate for your version stream
Vendor Advisory: https://www.dell.com/support/kbdoc/en-us/000415586/dsa-2026-049-security-update-for-dell-powerscale-onefs-multiple-vulnerabilities
Restart Required: Yes
Instructions:
1. Review Dell advisory DSA-2026-049. 2. Download appropriate OneFS update from Dell Support. 3. Apply update following Dell's OneFS upgrade procedures. 4. Reboot system as required by update.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to PowerScale management interfaces to trusted administrative networks only
Configure network ACLs/firewalls to limit access to PowerScale nodes to authorized IP ranges only
Privilege Reduction
allMinimize low-privileged user accounts with access to PowerScale systems
Review and remove unnecessary user accounts with access to PowerScale management interfaces
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PowerScale systems from non-administrative networks
- Increase monitoring for anomalous access patterns or denial of service attempts against PowerScale systems
🔍 How to Verify
Check if Vulnerable:
Check OneFS version via CLI: 'isi version' or web UI under Cluster Management > General SetupCheck Version:
isi versionVerify Fix Applied:
Verify version is updated to patched release: 9.5.1.6+, 9.7.1.11+, 9.10.1.4+, or 9.13.0.0+📡 Detection & Monitoring
Log Indicators:
- Multiple rapid authentication attempts from same source
- Unexpected process crashes or restarts in OneFS logs
- Access pattern anomalies in audit logs
Network Indicators:
- Unusual traffic spikes to PowerScale management interfaces
- Multiple connection attempts from non-administrative networks
SIEM Query:
source="powerscale*" AND (event_type="authentication_failure" OR event_type="service_crash") | stats count by src_ip