CVE-2021-47437

Local driver hang via frequency-set deadlock

Published May 22, 2024 · Updated May 11, 2026

Improper locking in the ADIS16475 IIO driver in Linux 5.13 through 5.14.13 allows local users to hang frequency-setting operations. The adis16475_set_freq path holds the device lock, calls the locking adis_write_reg_16 helper, and also returns successfully without releasing the lock. Triggering either deadlock requires local access to the sampling-frequency control on a system with a supported ADIS16475-family IMU, and the documented consequence is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the ADIS16475 IIO driver in Linux 5.13 through 5.14.13 allows local users to hang frequency-setting operations. The adis16475_set_freq path holds the device lock, calls the locking adis_write_reg_16 helper, and also returns successfully without releasing the lock. Triggering either deadlock requires local access to the sampling-frequency control on a system with a supported ADIS16475-family IMU, and the documented consequence is limited to availability.

The record

CVE
CVE-2021-47437
Published
May 22, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 22, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=39c024b51b5607e9d2fc6c04c2573e4a778c728d <04e03b907022ebd876f422f17efcc2c6cc934dc6
  2. Affected versionversion=39c024b51b5607e9d2fc6c04c2573e4a778c728d <9da1b86865ab4376408c58cd9fec332c8bdb5c73
  3. Affected versionversion=5.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=39c024b51b5607e9d2fc6c04c2573e4a778c728d <04e03b907022ebd876f422f17efcc2c6cc934dc6; version=39c024b51b5607e9d2fc6c04c2573e4a778c728d <9da1b86865ab4376408c58cd9fec332c8bdb5c73; version=5.13

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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