CVE-2021-47192

SCSI recovery hang via state_mutex deadlock

Published Apr 10, 2024 · Updated May 23, 2026

Improper locking in affected Linux kernel releases allows local users to hang SCSI recovery by setting device state through sysfs. The SCSI state-change path calls scsi_rescan_device() while holding state_mutex, while the error handler needs the same mutex and queued I/O cannot complete during host recovery. Reaching the deadlock requires privileged local sysfs access, an iSCSI recovery, and a race with SCSI error handling; the resulting impact is a storage-recovery hang.

CVSS severity5.3
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in affected Linux kernel releases allows local users to hang SCSI recovery by setting device state through sysfs. The SCSI state-change path calls scsi_rescan_device() while holding state_mutex, while the error handler needs the same mutex and queued I/O cannot complete during host recovery. Reaching the deadlock requires privileged local sysfs access, an iSCSI recovery, and a race with SCSI error handling; the resulting impact is a storage-recovery hang.

The record

CVE
CVE-2021-47192
Published
Apr 10, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 10, 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=5.10.61 <5.10.82
  2. Affected versionversion=5.13.13 <5.14
  3. Affected versionversion=5.14
  4. Affected versionversion=5.4.143 <5.4.162
  5. Affected versionversion=69aa1a1a569f5c6d554b59352130ef363342ed4c <edd783162bf2385b43de6764f2d4c6e9f4f6be27
  6. Affected versionversion=711459514e297d748f15ba1f5292a3276c3d1dd0 <a792e0128d232251edb5fdf42fb0f9fbb0b44a73
  7. Affected versionversion=c6751ce1a2a415a78e4f5b621628da03196b804c
  8. Affected versionversion=f0f82e2476f6adb9c7a0135cfab8091456990c99 <4edd8cd4e86dd3047e5294bbefcc0a08f66a430f
  9. Affected versionversion=f0f82e2476f6adb9c7a0135cfab8091456990c99 <bcc0e3175a976b7fa9a353960808adb0bb49ead8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.10.61 <5.10.82; version=5.13.13 <5.14; version=5.14; version=5.4.143 <5.4.162; version=69aa1a1a569f5c6d554b59352130ef363342ed4c <edd783162bf2385b43de6764f2d4c6e9f4f6be27; version=711459514e297d748f15ba1f5292a3276c3d1dd0 <a792e0128d232251edb5fdf42fb0f9fbb0b44a73; version=c6751ce1a2a415a78e4f5b621628da03196b804c; version=f0f82e2476f6adb9c7a0135cfab8091456990c99 <4edd8cd4e86dd3047e5294bbefcc0a08f66a430f; version=f0f82e2476f6adb9c7a0135cfab8091456990c99 <bcc0e3175a976b7fa9a353960808adb0bb49ead8

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
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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