CVE-2021-26384

Platform resource exhaustion via malformed SMI trigger data

Published Jul 14, 2022 · Updated Sep 16, 2024

Resource exhaustion in AMD Ryzen and Athlon Series firmware allows local users to interrupt platform operation through malformed SMI commands. The SMI handler accepts malformed command data and builds a corrupted SMI Trigger Info structure that drives out-of-bounds reads and writes. Exploitation requires high privileges and local execution; triggering the SMI can exhaust platform resources, while published evidence does not establish code execution.

CVSS severity3.0
Low
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 exhaustion in AMD Ryzen and Athlon Series firmware allows local users to interrupt platform operation through malformed SMI commands. The SMI handler accepts malformed command data and builds a corrupted SMI Trigger Info structure that drives out-of-bounds reads and writes. Exploitation requires high privileges and local execution; triggering the SMI can exhaust platform resources, while published evidence does not establish code execution.

The record

CVE
CVE-2021-26384
Published
Jul 14, 2022
Updated
Sep 16, 2024
Vendor
AMD
Product
AMD Ryzen Series
Classifications
CWE-125, CWE-787, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record 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=various

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

AMD · AMD Ryzen Seriesversion=various
AMD · AMD Athlon Seriesversion=various

Published CVSS scores

3.0AMDCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:L
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-787Out-of-bounds Write
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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