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CVE Record

CVE-2021-47051: spi: fsl-lpspi: Fix PM reference leak in lpspi_prepare_xfer_hardware()

In the Linux kernel, the following vulnerability has been resolved: spi: fsl-lpspi: Fix PM reference leak in lpspi_prepare_xfer_hardware() pm_runtime_get_sync will increment pm usage counter even it failed. Forgetting to putting operation will result in reference leak here. Fix it by replacing it with pm_runtime_resume_and_get to keep usage counter balanced.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a driver-specific resource accounting bug, not a documented remote compromise. In the Freescale/NXP LPSPI SPI driver, a failed power-management resume could leave an internal usage counter elevated. The likely business impact is reliability or power-management degradation on affected systems, especially embedded Linux platforms using this driver.

Executive priority

Treat this as a targeted kernel maintenance item, not an emergency, unless critical devices use the affected SPI driver and depend on runtime power management stability. Patch through normal kernel update channels after confirming exposure.

Technical view

CVE-2021-47051 fixes a runtime PM reference leak in lpspi_prepare_xfer_hardware() in the Linux fsl-lpspi SPI driver. The source states pm_runtime_get_sync() increments the PM usage counter even on failure; the fix replaces it with pm_runtime_resume_and_get() to keep the counter balanced.

Likely exposure

Exposure appears limited to Linux kernels using the fsl-lpspi SPI controller driver in affected kernel versions or commits. The source lists Linux as affected but provides no CPEs, CVSS, or deployment-specific product inventory guidance.

Exploitation context

The supplied sources do not report active exploitation, and KEV status is false. No public source in the bundle describes exploitability, prerequisites, or security impact beyond the PM reference leak fixed in kernel stable commits.

Researcher notes

The record lacks CVSS, CWE, CPEs, exploit details, and concrete impact claims. The strongest evidence is the upstream stable fix description. Analysis should stay constrained to PM reference leakage in the fsl-lpspi driver.

Mitigation direction

  • Upgrade to a Linux kernel containing the referenced stable fixes.
  • Prioritize embedded or SoC systems using the fsl-lpspi SPI driver.
  • Check vendor kernel advisories for backported fixes in downstream kernels.
  • Avoid assuming mainline version numbers cover vendor-maintained kernels.

Validation and detection

  • Inventory systems for Linux kernels in the affected version set.
  • Confirm whether the fsl-lpspi driver is built, loaded, or required.
  • Compare kernel source or package changelog against the referenced stable commits.
  • Review vendor advisories for equivalent backport identifiers.
Prepared
Confidence
medium
Sources
7

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-2021-47051 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
6Source 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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux944c01a889d97dc08e1b71f4ed868f4023fd6034, 944c01a889d97dc08e1b71f4ed868f4023fd6034, 944c01a889d97dc08e1b71f4ed868f4023fd6034, 944c01a889d97dc08e1b71f4ed868f4023fd6034, 944c01a889d97dc08e1b71f4ed868f4023fd6034unaffected
LinuxLinux5.2, 0, 5.4.119, 5.10.37, 5.11.21, 5.12.4, 5.13affected
Weakness

CWE details

No CWE listed

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