CVE-2021-47188

Service interruption via stale UFS command pointer

Published Apr 10, 2024 · Updated Aug 5, 2026

Incorrect SCSI abort handling in Linux 3.4 through 5.15.4 allows local users to interrupt service through UFS errors. The UFS SCSI abort handler leaves lrbp->cmd uncleared, so ufshcd_queuecommand later encounters a stale command pointer and triggers WARN_ON. Exploitation requires local low-privilege access and a UFS device entering SCSI error recovery; the documented consequence is limited to availability.

CVSS severity5.5
Medium
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

Incorrect SCSI abort handling in Linux 3.4 through 5.15.4 allows local users to interrupt service through UFS errors. The UFS SCSI abort handler leaves lrbp->cmd uncleared, so ufshcd_queuecommand later encounters a stale command pointer and triggers WARN_ON. Exploitation requires local low-privilege access and a UFS device entering SCSI error recovery; the documented consequence is limited to availability.

The record

CVE
CVE-2021-47188
Published
Apr 10, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 10, 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

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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=3.4
  2. Affected versionversion=7a3e97b0dc4bbac2ba7803564ab0057722689921 <3ff1f6b6ba6f97f50862aa50e79959cc8ddc2566
  3. Affected versionversion=7a3e97b0dc4bbac2ba7803564ab0057722689921 <9491bc16082d9a402c9099acbfffc89af6f9316f
  4. Affected versionversion=7a3e97b0dc4bbac2ba7803564ab0057722689921 <c36baca06efa833adaefba61f45fefdc49b6d070

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.4; version=7a3e97b0dc4bbac2ba7803564ab0057722689921 <3ff1f6b6ba6f97f50862aa50e79959cc8ddc2566; version=7a3e97b0dc4bbac2ba7803564ab0057722689921 <9491bc16082d9a402c9099acbfffc89af6f9316f; version=7a3e97b0dc4bbac2ba7803564ab0057722689921 <c36baca06efa833adaefba61f45fefdc49b6d070

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

No sourced classifications are available.

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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