CVE-2021-47329

Local service interruption via failed probe cleanup

Published May 21, 2024 · Updated May 11, 2026

Resource exhaustion in Linux kernel megaraid_sas allows local users to interrupt service through a failed PCI device probe. The probe error paths after scsi_add_host() or megasas_start_aen() failure return without releasing all resources allocated during initialization. Reachability requires a MegaRAID SAS controller probe and one of those initialization failures; the resulting leak consumes kernel resources without reported data exposure or modification.

CVSS severity6.2
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Linux kernel megaraid_sas allows local users to interrupt service through a failed PCI device probe. The probe error paths after scsi_add_host() or megasas_start_aen() failure return without releasing all resources allocated during initialization. Reachability requires a MegaRAID SAS controller probe and one of those initialization failures; the resulting leak consumes kernel resources without reported data exposure or modification.

The record

CVE
CVE-2021-47329
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-400, T1499
Attack vector
local
Privileges
unauthenticated

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=3.0
  2. Affected versionversion=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <04b6b9ea80906e3b41ff120b45db31768947cf72
  3. Affected versionversion=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <0680db6f41920b2c91c7df3cc9cd5968701a6f74
  4. Affected versionversion=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <0c6226601c3e191a44a57d8f9f814b7e5c308959
  5. Affected versionversion=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <b5438f48fdd8e1c3f130d32637511efd32038152
  6. Affected versionversion=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <e623f79691c5104317669ab36ec316a90c05062f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.0; version=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <04b6b9ea80906e3b41ff120b45db31768947cf72; version=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <0680db6f41920b2c91c7df3cc9cd5968701a6f74; version=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <0c6226601c3e191a44a57d8f9f814b7e5c308959; version=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <b5438f48fdd8e1c3f130d32637511efd32038152; version=541f90b7c6dffe4cf4a3e8142ac8bd047da94733 <e623f79691c5104317669ab36ec316a90c05062f
The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f4 <04b6b9ea8090; version=1da177e4c3f4 <0680db6f4192; version=1da177e4c3f4 <0c6226601c3e; version=1da177e4c3f4 <b5438f48fdd8; version=1da177e4c3f4 <e623f79691c5

Published CVSS scores

6.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
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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