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Powerscale OnefsOperating system · Dell

CVE-2026-21423

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 incorrect default permissions vulnerability. A high privileged attacker with local access could potentially exploit this vulnerability, leading to code execution, 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 incorrect default file/system permissions that allow a high-privileged local attacker to potentially escalate privileges, execute arbitrary code, cause denial of service, or access sensitive information. The vulnerability stems from overly permissive default settings on the storage system.

MitigationApply the vendor patch (version 9.10.1.6 or later for older branches, or the appropriate fix for 9.11.0.0-9.12.0.1) to remediate the incorrect default permissions configuration.

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 PowerScale OneFS version
    Run 'isi version' or 'isi --version' from the OneFS CLI to retrieve the current firmware version
    Affected if The version is less than 9.10.1.6 OR falls between 9.11.0.0 and 9.12.0.1 inclusive (or less than 9.13.0.0 for the 9.11+ branch) indicating the system is in the affected version range
  2. Verify default file permissions on system directories
    Inspect default permissions on critical directories such as /etc, /var, and /home using 'ls -ld /etc /var /home' to identify if world-readable or group-writable permissions exist unexpectedly
    Affected if Any system directories display permissions beyond the expected restrictive defaults (such as 755 or more open) indicating overly permissive settings
  3. Check for world-writable system files
    Search for files with world-writable permissions (permissions containing 'w' for 'other') in system directories using 'find / -perm -002 -type f 2>/dev/null' to locate incorrectly configured files
    Affected if Any system-critical files are found with world-writable permissions, which could allow unauthorized modification
  4. Review default ACL or umask settings
    Check the system's default umask value via 'umask' command and review any custom ACL configurations that may govern default file creation permissions
    Affected if The umask is set to a value that results in overly permissive file creation (such as 000 or 002) or non-standard ACLs that grant broader access than intended

A system is affected if it runs a OneFS version in the vulnerable range AND exhibits default permissions that are more open than the secure baseline (world-readable/writable files or overly permissive default ACLs).

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 patch (version 9.10.1.6 or later for older branches, or the appropriate fix for 9.11.0.0-9.12.0.1) to remediate the incorrect default permissions configuration.

Recommended fix High confidence

OneFS 9.13.0.0 or later

  1. 1. Identify the current PowerScale OneFS version by running `isi get` or checking the cluster management interface
  2. 2. Schedule a maintenance window for the upgrade (this is a firmware/software upgrade requiring downtime
  3. 3. Back up all critical data and cluster configuration
  4. 4. Download the fixed OneFS version (9.13.0.0 or later) from the Dell Support portal at support.dell.com
  5. 5. Follow Dell PowerScale OneFS upgrade documentation to apply the update
  6. 6. Verify the upgrade was successful by checking the OneFS version post-upgrade
  7. 7. Confirm the vulnerability is resolved
Caveat Upgrades between major versions may require careful planning; review Dell upgrade documentation for any prerequisites or configuration changes needed

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

Fix this in Powerscale Onefs Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
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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-2026-21423 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