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CVE Record

CVE-2021-47437: iio: adis16475: fix deadlock on frequency set

In the Linux kernel, the following vulnerability has been resolved: iio: adis16475: fix deadlock on frequency set With commit 39c024b51b560 ("iio: adis16475: improve sync scale mode handling"), two deadlocks were introduced: 1) The call to 'adis_write_reg_16()' was not changed to it's unlocked version. 2) The lock was not being released on the success path of the function. This change fixes both these issues.

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 can cause a deadlock when setting frequency for the adis16475 Industrial I/O driver. The business impact appears availability-focused and likely narrow, tied to systems using this driver and affected kernel versions. The source bundle provides no CVSS score or broad-impact evidence.

Executive priority

Treat this as a targeted Linux kernel availability risk, not a confirmed emergency. Prioritize patch validation where affected kernels and adis16475-related hardware or driver use exist. Broader enterprise urgency is limited by the lack of CVSS, KEV, or exploitation evidence in the bundle.

Technical view

CVE-2021-47437 fixes two locking bugs introduced by commit 39c024b51b560 in the Linux kernel adis16475 driver: a locked register write path was used incorrectly, and a successful path failed to release the lock. Stable kernel commits are referenced as fixes.

Likely exposure

Exposure is most likely limited to Linux kernels containing the affected adis16475 driver change, especially listed versions around 5.13, 5.14.14, and 5.15. Systems not using this driver or related hardware path are less likely to be affected.

Exploitation context

The bundle does not cite active exploitation, public exploit use, or CISA KEV listing. The described failure mode is a kernel driver deadlock during frequency setting, suggesting denial-of-service potential, but access requirements are not established in the provided sources.

Researcher notes

The record identifies a regression-style locking flaw in a specific kernel driver. The evidence is sparse: no CWE, CVSS, exploitability detail, or access vector is provided. Analysis should focus on commit presence, downstream backports, and whether userspace can trigger the affected frequency-setting path.

Mitigation direction

  • Review vendor kernel advisories for CVE-2021-47437 applicability.
  • Update to a kernel build containing the referenced stable fixes.
  • Prioritize systems using the adis16475 Industrial I/O driver.
  • If updates are delayed, assess whether the driver is needed.
  • Track downstream distribution patches rather than relying only on upstream versions.

Validation and detection

  • Inventory Linux kernel versions against the affected range in the source bundle.
  • Check whether the adis16475 driver is present and used.
  • Confirm whether the referenced stable fix commits are included.
  • Review distribution security notes for backported fixes.
  • Record systems with relevant IIO sensor hardware for remediation tracking.
Prepared
Confidence
medium
Sources
4

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-2021-47437 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
3Source 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
LinuxLinux39c024b51b5607e9d2fc6c04c2573e4a778c728d, 39c024b51b5607e9d2fc6c04c2573e4a778c728dunaffected
LinuxLinux5.13, 0, 5.14.14, 5.15affected
Weakness

CWE details

No CWE listed

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