CVE-2023-31356

Guest-memory corruption via incomplete firmware cleanup

Published Aug 13, 2024 · Updated Feb 11, 2025

Incomplete cleanup in SEV firmware on affected AMD EPYC 7003 and 9004 processors allows local users to corrupt guest private memory. The SEV firmware's system-memory cleanup leaves memory incompletely cleared, enabling writes that corrupt private guest-memory contents. Administrative platform privileges are required; the documented consequence is loss of guest data integrity, not disclosure or service interruption.

CVSS severity4.4
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

Incomplete cleanup in SEV firmware on affected AMD EPYC 7003 and 9004 processors allows local users to corrupt guest private memory. The SEV firmware's system-memory cleanup leaves memory incompletely cleared, enabling writes that corrupt private guest-memory contents. Administrative platform privileges are required; the documented consequence is loss of guest data integrity, not disclosure or service interruption.

The record

CVE
CVE-2023-31356
Published
Aug 13, 2024
Updated
Feb 11, 2025
Vendor
Advanced Micro Devices, Inc.
Product
AMD EPYC Embedded 7003 Series Processors
Classifications
CWE-459, T1565
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Advanced Micro Devices, Inc. · AMD EPYC Embedded 7003 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD EPYC 7003 ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD EPYC Embedded 9004 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD EPYC 9004 ProcessorsAffected versions are unavailable in this record.

Published CVSS scores

4.4Advanced Micro Devices, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
T1565Data Manipulation

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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