CVE-2021-47172

Service interruption via unchecked ADC channel index

Published Mar 25, 2024 · Updated May 23, 2026

Buffer overflow in the Linux kernel AD7124 ADC driver allows local users to interrupt service through malformed channel numbering. The ad7124_of_parse_channel_config function uses each device-tree child's reg value to index channel arrays without first checking it against num_channels. Reachability requires an AD7124 configuration with nonsequential or oversized channel indices, and the published impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the Linux kernel AD7124 ADC driver allows local users to interrupt service through malformed channel numbering. The ad7124_of_parse_channel_config function uses each device-tree child's reg value to index channel arrays without first checking it against num_channels. Reachability requires an AD7124 configuration with nonsequential or oversized channel indices, and the published impact is limited to availability.

The record

CVE
CVE-2021-47172
Published
Mar 25, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-120
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5408cbc6337300d6f1a87c797273c535ed96305a <f49149964d2423fb618fb6b755bb1eaa431cca2c
  2. Affected versionversion=5.4.14 <5.4.124
  3. Affected versionversion=5.5
  4. Affected versionversion=d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 <26da8040eccc6c6b0e415e9a3baf72fd39eb2fdc
  5. Affected versionversion=d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 <f2a772c51206b0c3f262e4f6a3812c89a650191b
  6. Affected versionversion=d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 <f70122825076117787b91e7f219e21c09f11a5b9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5408cbc6337300d6f1a87c797273c535ed96305a <f49149964d2423fb618fb6b755bb1eaa431cca2c; version=5.4.14 <5.4.124; version=5.5; version=d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 <26da8040eccc6c6b0e415e9a3baf72fd39eb2fdc; version=d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 <f2a772c51206b0c3f262e4f6a3812c89a650191b; version=d7857e4ee1ba69732b16c73b2f2dde83ecd78ee4 <f70122825076117787b91e7f219e21c09f11a5b9

Published CVSS scores

5.5CISA-ADPCVSS: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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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