CVE-2023-31364Network attack vector

Host crash via malformed SMI flooding

Published Feb 26, 2026 · Updated Feb 26, 2026

Improper IOMMU memory-write handling in affected AMD processors allows guest OS users to crash a virtualization host. Malformed System Management Interrupt flooding from a guest VM drives repeated direct writes through the IOMMU until the host raises a fatal machine check error. Execution requires control of a guest VM; a successful attack crashes the host and interrupts every co-located guest.

CVSS severity8.3
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper IOMMU memory-write handling in affected AMD processors allows guest OS users to crash a virtualization host. Malformed System Management Interrupt flooding from a guest VM drives repeated direct writes through the IOMMU until the host raises a fatal machine check error. Execution requires control of a guest VM; a successful attack crashes the host and interrupts every co-located guest.

The record

CVE
CVE-2023-31364
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
Advanced Micro Devices, Inc.
Product
AMD Ryzen™ 7000 Series Desktop Processors
Classifications
CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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=No Fix Planned

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Advanced Micro Devices, Inc. · AMD Ryzen™ 7000 Series Desktop Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ Embedded V1000 Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ Threadripper™ PRO 3000 WX-Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen 7040 Series Mobile Processors with Radeon Graphicsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphicsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC Embedded 8004 Series Processorsversion=EmbGenoaPI-SP5 1.0.0.B
Advanced Micro Devices, Inc. · AMD Ryzen™ Embedded R2000 Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ Threadripper™ PRO 5000 WX-Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC Embedded 7003 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD Ryzen™ 7045 Series Mobile Processors with Radeon™ Graphicsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC Embedded 7002 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphicsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ Embedded V3000 Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC Embedded 9004 Series Processorsversion=EmbGenoaPI-SP5 1.0.0.B
Advanced Micro Devices, Inc. · AMD Ryzen Embedded V2000 Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC Embedded 3000 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD Ryzen™ Embedded 5000 Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphicsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen Embedded 8000 Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ 6000 Series Processors with Radeon™ Graphicsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC 9005 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD Ryzen Embedded 7000 Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC™ 8004 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD Ryzen™ 8000 Series Desktop Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC™ 9004 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD EPYC™ 7001 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD EPYC 7002 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD Ryzen™ 7020 Series Processors with Radeon™ Graphicsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ Embedded R1000 Series Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD Ryzen™ 3000 Series Desktop Processorsversion=No Fix Planned
Advanced Micro Devices, Inc. · AMD EPYC Embedded 9005 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD EPYC™ 7003 Series ProcessorsAffected versions are unavailable in this record.
Advanced Micro Devices, Inc. · AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphicsversion=No Fix Planned

Published CVSS scores

8.3Advanced Micro DevicesCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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