Guest-to-host memory writes via improper bounds check
Published Feb 10, 2026 · Updated Feb 10, 2026
Improper bounds checking in AMD EPYC 9005 Series processor microcode allows guest OS users to write host memory and compromise integrity. The microcode accepts a guest-controlled quantity without enforcing its valid bounds, allowing the resulting operation to target memory owned by the host. Exploitation requires low-privileged access inside a guest, and the reported consequence is unauthorized host-memory modification rather than disclosure or interruption.
Summary
What happened
Improper bounds checking in AMD EPYC 9005 Series processor microcode allows guest OS users to write host memory and compromise integrity. The microcode accepts a guest-controlled quantity without enforcing its valid bounds, allowing the resulting operation to target memory owned by the host. Exploitation requires low-privileged access inside a guest, and the reported consequence is unauthorized host-memory modification rather than disclosure or interruption.
The record
- CVE
- CVE-2025-52534
- Published
- Feb 10, 2026
- Updated
- Feb 10, 2026
- Vendor
- Advanced Micro Devices, Inc.
- Product
- AMD EPYC 9005 Series Processors
- Classifications
- CWE-1284, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 10, 2026CVE publishedPublication date reported by the CVE source.
- Feb 10, 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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