CVE-2021-47498

Kernel panic via suspended device-mapper request queue

Published May 22, 2024 · Updated May 11, 2026

Race condition in the Linux kernel device-mapper request queue allows local users to trigger a kernel panic during suspend. The dm_mq_queue_rq function accepted a blk-mq request while DMF_BLOCK_IO_FOR_SUSPEND was set instead of returning BLK_STS_RESOURCE for requeueing. Reaching the observed panic requires concurrent nr_requests updates and dm-multipath suspend and resume activity; the bounded impact is a host crash.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel device-mapper request queue allows local users to trigger a kernel panic during suspend. The dm_mq_queue_rq function accepted a blk-mq request while DMF_BLOCK_IO_FOR_SUSPEND was set instead of returning BLK_STS_RESOURCE for requeueing. Reaching the observed panic requires concurrent nr_requests updates and dm-multipath suspend and resume activity; the bounded impact is a host crash.

The record

CVE
CVE-2021-47498
Published
May 22, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
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=4.10
  2. Affected versionversion=7b17c2f7292ba1f3f98dae3f7077f9e569653276 <8050652810bf38241edec8717393d2446e8036f1
  3. Affected versionversion=7b17c2f7292ba1f3f98dae3f7077f9e569653276 <8ca9745efe3528feb06ca4e117188038eea2d351
  4. Affected versionversion=7b17c2f7292ba1f3f98dae3f7077f9e569653276 <b4459b11e84092658fa195a2587aff3b9637f0e7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=7b17c2f7292ba1f3f98dae3f7077f9e569653276 <8050652810bf38241edec8717393d2446e8036f1; version=7b17c2f7292ba1f3f98dae3f7077f9e569653276 <8ca9745efe3528feb06ca4e117188038eea2d351; version=7b17c2f7292ba1f3f98dae3f7077f9e569653276 <b4459b11e84092658fa195a2587aff3b9637f0e7

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

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

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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