CVE-2022-23818Public exploit

Guest-memory corruption via misclassified VM_HSAVE_PA page

Published May 9, 2023 · Updated Jan 28, 2025

Improper input validation in 3rd Gen AMD EPYC processors allows attackers controlling the hypervisor to corrupt SEV-SNP guest memory. Firmware classifies the immutable, unassigned VM_HSAVE_PA destination as a default page, so swap_out skips its page-size check and copies 2 MiB across assigned pages. Exploitation requires control of the hypervisor and can overwrite protected firmware or guest pages, violating guest-memory integrity.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in 3rd Gen AMD EPYC processors allows attackers controlling the hypervisor to corrupt SEV-SNP guest memory. Firmware classifies the immutable, unassigned VM_HSAVE_PA destination as a default page, so swap_out skips its page-size check and copies 2 MiB across assigned pages. Exploitation requires control of the hypervisor and can overwrite protected firmware or guest pages, violating guest-memory integrity.

The record

CVE
CVE-2022-23818
Published
May 9, 2023
Updated
Jan 28, 2025
Vendor
Advanced Micro Devices, Inc.
Product
3rd Gen AMD EPYC Processors
Classifications
CWE-20
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 2025Record 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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Advanced Micro Devices, Inc. · 3rd Gen AMD EPYC Processorsversion=various

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation

Public exploit references

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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