CVE-2021-47500

Kernel memory corruption via premature trigger release

Published May 24, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux mma8452 accelerometer driver allows local users to crash the kernel or corrupt kernel memory. The driver assigns its trigger to an IIO device without acquiring a matching reference, so the core can free the trigger while it remains in use. Access to a system using the mma8452 driver and trigger is required; premature release can corrupt kernel memory or interrupt the system.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux mma8452 accelerometer driver allows local users to crash the kernel or corrupt kernel memory. The driver assigns its trigger to an IIO device without acquiring a matching reference, so the core can free the trigger while it remains in use. Access to a system using the mma8452 driver and trigger is required; premature release can corrupt kernel memory or interrupt the system.

The record

CVE
CVE-2021-47500
Published
May 24, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.2
  2. Affected versionversion=ae6d9ce05691bf79694074db7c7da980080548af <094d513b78b1714113bc016684b8142382e071ba
  3. Affected versionversion=ae6d9ce05691bf79694074db7c7da980080548af <794c0898f6bf39a458655d5fb4af70ec43a5cfcb
  4. Affected versionversion=ae6d9ce05691bf79694074db7c7da980080548af <acf0088ac073ca6e7f4cad6acac112177e08df5e
  5. Affected versionversion=ae6d9ce05691bf79694074db7c7da980080548af <c43517071dfc9fce34f8f69dbb98a86017f6b739
  6. Affected versionversion=ae6d9ce05691bf79694074db7c7da980080548af <cd0082235783f814241a1c9483fb89e405f4f892
  7. Affected versionversion=ae6d9ce05691bf79694074db7c7da980080548af <db12d95085367de8b0223929d1332731024441f1
  8. Affected versionversion=ae6d9ce05691bf79694074db7c7da980080548af <f5deab10ced368c807866283f8b79144c4823be8
  9. Affected versionversion=ae6d9ce05691bf79694074db7c7da980080548af <fb75cc4740d81264cd5bcb0e17d961d018a8be96

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.2; version=ae6d9ce05691bf79694074db7c7da980080548af <094d513b78b1714113bc016684b8142382e071ba; version=ae6d9ce05691bf79694074db7c7da980080548af <794c0898f6bf39a458655d5fb4af70ec43a5cfcb; version=ae6d9ce05691bf79694074db7c7da980080548af <acf0088ac073ca6e7f4cad6acac112177e08df5e; version=ae6d9ce05691bf79694074db7c7da980080548af <c43517071dfc9fce34f8f69dbb98a86017f6b739; version=ae6d9ce05691bf79694074db7c7da980080548af <cd0082235783f814241a1c9483fb89e405f4f892; version=ae6d9ce05691bf79694074db7c7da980080548af <db12d95085367de8b0223929d1332731024441f1; version=ae6d9ce05691bf79694074db7c7da980080548af <f5deab10ced368c807866283f8b79144c4823be8; version=ae6d9ce05691bf79694074db7c7da980080548af <fb75cc4740d81264cd5bcb0e17d961d018a8be96

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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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-416Use After Free
T1499.004Endpoint Denial of Service: Application 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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