Firmware code execution via unchecked SMM input
Published Feb 11, 2025 · Updated Feb 26, 2026
Improper input validation in AMD processor SMM handlers allows local privileged users to overwrite SMRAM and execute arbitrary code. AMD has not disclosed which SMM handler entry point accepts the malformed input or which validation check is missing before the SMRAM write. Exploitation requires high local privileges and complex conditions, but successful execution gains control in the privileged firmware context.
Summary
What happened
Improper input validation in AMD processor SMM handlers allows local privileged users to overwrite SMRAM and execute arbitrary code. AMD has not disclosed which SMM handler entry point accepts the malformed input or which validation check is missing before the SMRAM write. Exploitation requires high local privileges and complex conditions, but successful execution gains control in the privileged firmware context.
The record
- CVE
- CVE-2023-31345
- Published
- Feb 11, 2025
- Updated
- Feb 26, 2026
- Vendor
- Advanced Micro Devices, Inc.
- Product
- AMD Ryzen™ 7000 Series Desktop Processors
- Classifications
- CWE-1274, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Feb 11, 2025CVE publishedPublication date reported by the CVE source.
- 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?
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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