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Powerscale OnefsOperating system · Dell

CVE-2026-21421

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 elevation of privileges.

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 local privilege escalation vulnerability where a high-privileged authenticated attacker can exploit execution with unnecessary privileges to elevate their privileges further. The vulnerability affects versions prior to 9.10.1.6 and versions 9.11.0.0 through 9.12.0.1.

MitigationApply the vendor-supplied patch by upgrading to Dell PowerScale OneFS version 9.10.1.6 or later, or a version beyond 9.12.0.1 that includes the fix.

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. Identify installed OneFS version
    Run the command 'isi version' or 'isi_get_version' on the PowerScale node to retrieve the current firmware version
    Affected if The version returned is below 9.10.1.6, or is 9.11.0.0 through 9.12.0.1 inclusive
  2. Confirm OneFS product
    Verify the system is indeed Dell PowerScale OneFS by checking the product name via 'isi hardware' or the system GUI login banner
    Affected if The product is Dell PowerScale OneFS and the version meets the condition in step 1
  3. Check for existing high-privilege accounts
    Review local user accounts with administrative or root-level privileges using 'isi auth users' or the OneFS web UI under Access > Users
    Affected if There are multiple high-privilege accounts present, indicating the condition for exploitation (high-privileged authenticated attacker) could be met
  4. Audit privilege assignment
    Examine role-based access control (RBAC) configurations via 'isi auth roles' to identify accounts with elevated permissions beyond their operational need
    Affected if Accounts exist with more privileges than required for their function, which aligns with the 'execution with unnecessary privileges' attack vector described

A system is affected if it runs Dell PowerScale OneFS version below 9.10.1.6, or any version between 9.11.0.0 and 9.12.0.1 inclusive.

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

Apply the vendor-supplied patch by upgrading to Dell PowerScale OneFS version 9.10.1.6 or later, or a version beyond 9.12.0.1 that includes the fix.

Recommended fix Moderate confidence

OneFS 9.13.0.0 (or 9.10.1.6 for 9.10.x branch)

  1. Review Dell PowerScale OneFS upgrade documentation and release notes for version 9.13.0.0 or 9.10.1.6
  2. Create a complete backup of the OneFS cluster configuration and data
  3. Schedule a maintenance window as upgrades require cluster downtime
  4. Download the appropriate OneFS iso/image from Dell support portal for version 9.13.0.0 (or 9.10.1.6 for 9.10.x branch)
  5. Follow Dell's standard OneFS upgrade procedure: upload the upgrade image via the WebUI or CLI, then execute the 'isi upgrade' command
  6. Verify the upgrade completed successfully by checking the OneFS version with 'isi version'
  7. Confirm all cluster services are operational post-upgrade
Caveat OneFS upgrades typically require cluster downtime and may have significant changes; review release notes for compatibility requirements and potential impact on existing configurations

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
  • Implementation4.0 h
  • Testing8.0 h
  • Review / QA4.0 h
20.0 hours of engineering $3,440
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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-2026-21421 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