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Powerscale OnefsOperating system · Dell

CVE-2026-21426

MEDIUM · 6.7 CVSS v3.1 Published 2026-03-04
Fix available
A fix is available. Upgrade to 9.10.1.6 / 9.13.0.0 or later.
See remediation →
69/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Dell PowerScale OneFS, versions prior to 9.10.1.6 and versions 9.11.0.0 through 9.12.0.1, contains an execution with unnecessary privileges vulnerability. A high privileged attacker with local access could potentially exploit this vulnerability, leading to denial of service, elevation of privileges, and information disclosure.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Dell PowerScale OneFS contains a privilege escalation vulnerability where high-privileged local attackers can execute with unnecessary privileges, potentially achieving elevation of privileges beyond their assigned role, causing denial of service, and accessing sensitive information. The vulnerability affects versions prior to 9.10.1.6 and versions 9.11.0.0 through 9.12.0.1.

MitigationUpdate Dell PowerScale OneFS to version 9.10.1.6 or later (or a version beyond 9.12.0.1) to remediate the vulnerability. Apply during a planned maintenance window following vendor upgrade procedures.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Powerscale OnefsOperating system
Affected:< 9.10.1.6>= 9.11.0.0, < 9.13.0.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Determine OneFS version via CLI
    Run the command `isi version` or `isi system version` on the PowerScale node to retrieve the installed OneFS version number
    Affected if The displayed version falls in the ranges < 9.10.1.6 OR >= 9.11.0.0 and < 9.13.0.0
  2. Verify version via sysadmin
    If CLI access is unavailable, access the OneFS web admin interface and navigate to System > Settings > About to view the firmware version
    Affected if The version shown is within the affected ranges listed above
  3. Confirm version format
    Ensure the version number follows the correct format (for example, 9.10.0.0, 9.11.0.0, 9.12.0.1) and compare numerically against the affected ranges
    Affected if A version like 9.10.1.5, 9.11.0.0 through 9.12.0.1, or any 9.12.x version is installed
  4. Check for local administrative accounts
    Review local user accounts on the system using `isi auth users list` or through the Access > Users section in the web UI to identify any high-privileged local accounts
    Affected if High-privileged local accounts exist AND the OneFS version is in the affected ranges

You are affected if your PowerScale OneFS version is 9.10.1.5 or earlier, or between 9.11.0.0 and 9.12.0.1 (inclusive), or any 9.12.x version below 9.13.0.0.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 9.10.1.6 / 9.13.0.0 or later
Fixed in 9.10.1.69.13.0.0
Interim mitigation

Update Dell PowerScale OneFS to version 9.10.1.6 or later (or a version beyond 9.12.0.1) to remediate the vulnerability. Apply during a planned maintenance window following vendor upgrade procedures.

Recommended fix High confidence

OneFS 9.13.0.0 or later (or 9.10.1.6 or later for the 9.10.x branch)

  1. 1. Verify current PowerScale OneFS version by running 'isi version' or checking the web administration console
  2. 2. Schedule a maintenance window for the upgrade (recommended to be during low-usage period)
  3. 3. Create a complete backup of the cluster configuration and verify backup integrity
  4. 4. Download the appropriate OneFS ISO image (version 9.13.0.0 or later) from Dell Support portal (support.dell.com)
  5. 5. Mount the ISO image and initiate upgrade using 'isi upgrade' command or through the web administration interface
  6. 6. Follow the on-screen prompts to complete the upgrade process
  7. 7. Verify the upgrade was successful by checking 'isi version' output shows 9.13.0.0 or later
  8. 8. Confirm all cluster services are operational and performing normally
Caveat Review Dell PowerScale OneFS 9.13.0.0 release notes for any configuration changes or deprecated features before upgrading; test in non-production environment first

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Powerscale Onefs Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-21426 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data