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CVE Record

CVE-2021-47322: NFSv4: Fix an Oops in pnfs_mark_request_commit() when doing O_DIRECT

In the Linux kernel, the following vulnerability has been resolved: NFSv4: Fix an Oops in pnfs_mark_request_commit() when doing O_DIRECT Fix an Oopsable condition in pnfs_mark_request_commit() when we're putting a set of writes on the commit list to reschedule them after a failed pNFS attempt.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-47322 is a Linux kernel NFSv4 defect that can trigger a kernel Oops during direct I/O after a failed pNFS write attempt. The business concern is service instability on affected Linux systems using this storage path, not confirmed data theft or remote compromise.

Executive priority

Schedule remediation through normal kernel maintenance, with higher priority for production systems dependent on NFSv4/pNFS storage. There is no source evidence of active exploitation, but kernel Oops conditions can disrupt critical services.

Technical view

The issue is in pnfs_mark_request_commit(), where NFSv4/pNFS write requests are moved to a commit list for rescheduling after failed pNFS handling. The CVE record says this path was Oopsable when doing O_DIRECT. Linux stable commit references are provided as fixes.

Likely exposure

Exposure appears limited to affected Linux kernel versions using NFSv4/pNFS and O_DIRECT write behavior. The source lists affected Linux versions including 5.7, 5.10.52, 5.12.19, 5.13.4, and 5.14, but packaging and backports require vendor confirmation.

Exploitation context

The source bundle does not identify active exploitation, public exploit activity, CVSS scoring, or a CWE. CISA KEV status is false. Treat this as a kernel availability and reliability issue unless additional vendor evidence expands the impact.

Researcher notes

Evidence is narrow: the CVE describes an Oopsable NFSv4/pNFS direct I/O path and provides kernel stable fix links. No CVSS, CWE, exploit status, or detailed impact narrative is included, so exposure analysis should be confirmed against distribution-specific advisories and deployed workload behavior.

Mitigation direction

  • Apply a vendor-supported Linux kernel update containing the referenced stable fixes.
  • Check distribution advisories for backported fixes before relying on upstream version numbers.
  • Prioritize systems using NFSv4, pNFS, and direct I/O workloads.
  • If no update is available, ask the vendor for supported mitigation guidance.

Validation and detection

  • Inventory Linux kernel versions across NFS clients and servers.
  • Identify workloads using NFSv4 or pNFS with direct I/O.
  • Confirm whether installed vendor kernels include the referenced stable commits.
  • Review kernel logs for Oops events referencing pnfs_mark_request_commit or O_DIRECT.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2021-47322 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux9c455a8c1e146dac3a6d1405fe6a7096177b9546, 9c455a8c1e146dac3a6d1405fe6a7096177b9546, 9c455a8c1e146dac3a6d1405fe6a7096177b9546, 9c455a8c1e146dac3a6d1405fe6a7096177b9546unaffected
LinuxLinux5.7, 0, 5.10.52, 5.12.19, 5.13.4, 5.14affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.