CVE intelligence and bounded remediation

CVE-2021-36305 — Dell PowerScale OneFS contains an Unsynchronized Access to Shared Data in a Multithreaded Context in SMB CA handling

Medium CVSS 6.5

Dell PowerScale OneFS contains an Unsynchronized Access to Shared Data in a Multithreaded Context in SMB CA handling. An authenticated user of SMB on a cluster with CA could potentially exploit this vulnerability, leading to a denial of service over SMB.

Severity
Medium
CVSS
6.5 (3.1)
Published
2021-11-12
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-662

Affected products

  • dell / emc_powerscale_onefs / 8.2.0
  • dell / emc_powerscale_onefs / 8.2.1
  • dell / emc_powerscale_onefs / 8.2.2
  • dell / emc_powerscale_onefs / 9.0.0.0
  • dell / emc_powerscale_onefs / 9.1.0.0
  • dell / emc_powerscale_onefs / 9.1.1.0

Showing 6 representative product identities from 8 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Race condition, TOCTOU, and lifecycle synchronization

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Check exposure

  • Map concurrent actors, shared state, lock boundaries, signals, callbacks, retries, and check-then-use sequences in the affected path.
  • Determine whether untrusted users can influence timing, object names, filesystem state, or repeated state transitions.
  • Identify clustered and multi-process behavior that repository-local tests may not represent.

Remediate safely

  • Make the sensitive state transition atomic or protect it with a consistently ordered synchronization primitive.
  • Perform authorization and invariant checks on the same authoritative object and transaction used for the operation.
  • Use unique private resources, safe ownership transfer, and idempotent operations; add deterministic concurrency regression tests.

Authoritative sources

Complete CVE record and remediation plan

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