CVE-2021-47287

Service interrupt via auxiliary-driver registration leak

Published May 21, 2024 · Updated May 11, 2026

Resource leak in Linux kernel 5.11 through 5.13.5 and 5.14-rc1 through 5.14-rc2 allows local users to cause a service interrupt. __auxiliary_driver_register() allocates auxdrv->driver.name but returns after driver_register() fails without freeing that buffer. The path requires local access and an auxiliary-driver registration failure; each failed attempt leaves the allocated name unreleased, degrading availability.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in Linux kernel 5.11 through 5.13.5 and 5.14-rc1 through 5.14-rc2 allows local users to cause a service interrupt. __auxiliary_driver_register() allocates auxdrv->driver.name but returns after driver_register() fails without freeing that buffer. The path requires local access and an auxiliary-driver registration failure; each failed attempt leaves the allocated name unreleased, degrading availability.

The record

CVE
CVE-2021-47287
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=5.11
  2. Affected versionversion=7de3697e9cbd4bd3d62bafa249d57990e1b8f294 <4afa0c22eed33cfe0c590742387f0d16f32412f3
  3. Affected versionversion=7de3697e9cbd4bd3d62bafa249d57990e1b8f294 <ce5b3de58fc21303722df46551f7eb9a91afb409

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=7de3697e9cbd4bd3d62bafa249d57990e1b8f294 <4afa0c22eed33cfe0c590742387f0d16f32412f3; version=7de3697e9cbd4bd3d62bafa249d57990e1b8f294 <ce5b3de58fc21303722df46551f7eb9a91afb409

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.

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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-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

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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