Guest integrity loss via unchecked IOMMU write
Published Apr 16, 2026 · Updated Apr 16, 2026
Out-of-bounds write in the IOMMU on affected AMD EPYC processors allows attackers with hypervisor privileges to corrupt SNP guest data. During host buffer access, insufficient RMP checks let the IOMMU write beyond the supplied buffer length without enforcing protected guest memory boundaries. Exploitation requires local high privileges and a compromised hypervisor; confidentiality and availability impacts are not reported.
Summary
What happened
Out-of-bounds write in the IOMMU on affected AMD EPYC processors allows attackers with hypervisor privileges to corrupt SNP guest data. During host buffer access, insufficient RMP checks let the IOMMU write beyond the supplied buffer length without enforcing protected guest memory boundaries. Exploitation requires local high privileges and a compromised hypervisor; confidentiality and availability impacts are not reported.
The record
- CVE
- CVE-2023-20585
- Published
- Apr 16, 2026
- Updated
- Apr 16, 2026
- Vendor
- Advanced Micro Devices, Inc.
- Product
- AMD EPYC Embedded 7003 Series Processors
- Classifications
- CWE-788, T1565
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Apr 16, 2026CVE publishedPublication date reported by the CVE source.
- Apr 16, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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