CVE-2023-31342 — Improper input validation in the SMM handler may allow a privileged attacker to

Improper input validation in the SMM handler may allow a privileged attacker to overwrite SMRAM, potentially leading to arbitrary code execution.

01What is this vulnerability?

Improper input validation in the SMM handler may allow a privileged attacker to overwrite SMRAM, potentially leading to arbitrary code execution.

02Affected products

Vendor	Product	Versions
AMD	AMD EPYC™ 7003 Processors	MilanPI 1.0.0.C
AMD	AMD EPYC™ 9004 Processors	GenoaPI 1.0.0.B
AMD	AMD Instinct™ MI300A	MI300API 1.0.0.5
AMD	AMD Ryzen™ 3000 Series Desktop Processors	ComboAM4v2PI 1.2.0.C
AMD	AMD Ryzen™ 5000 Series Desktop Processors	ComboAM4v2PI 1.2.0.C
AMD	AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics	ComboAM4v2PI 1.2.0.C
AMD	AMD Ryzen™ 7000 Series Desktop Processors	ComboAM5 1.1.0.2
AMD	AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics	ComboAM4v2PI 1.2.0.C
AMD	AMD Ryzen™ 4000 Series Desktop Processor with Radeon™ Graphics	ComboAM4v2PI 1.2.0.C
AMD	AMD Ryzen™ 8000 Series Processor with Radeon™ Graphics	ComboAM5 1.1.0.2
AMD	AMD Ryzen™ Threadripper™ PRO 5000WX	Series Desktop Processors — ChagallWSPI-sWRX8 1.0.0.7
AMD	AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics	Pollock-FT5 1.0.0.7
AMD	AMD Ryzen™ 3000 Series Mobile Processor with Radeon™ Graphics	Picasso-FP5 1.0.1.1
AMD	AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics	RenoirPI-FP6 1.0.0.D
AMD	AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics	Cezanne-FP6 1.0.1.0
AMD	AMD Ryzen™ 7020 Series Processors with Radeon™ Graphics	MendocinoPI-FT6 1.0.0.6
AMD	AMD Ryzen™ 6000 Series Processor with Radeon™ Graphics	Rembrandt-FP7 1.0.0.A
AMD	AMD Ryzen™ 7035 Series Processor with Radeon™ Graphics	Rembrandt-FP7 1.0.0.A
AMD	AMD Ryzen™ 7040 Series Processors with Radeon™ Graphics	PhoenixPI-FP8-FP7 1.1.0.2
AMD	AMD Ryzen™ 7000 Series Mobile Processors	DragonRangeFL1PI 1.0.0.3C
AMD	AMD EPYC™ Embedded 7003	EmbMilanPI-SP3 1.0.0.8
AMD	AMD EPYC™ Embedded 9004	EmbGenoaPI-SP5 1.0.0.6
AMD	AMD Ryzen™ Embedded R1000	EmbeddedPI-FP5 1.2.0.C
AMD	AMD Ryzen™ Embedded R2000	EmbeddedR2KPI-FP5 1.0.0.3
AMD	AMD Ryzen™ Embedded 5000	EmbAM4PI 1.0.0.5
AMD	AMD Ryzen™ Embedded 7000	EmbeddedAM5PI 1.0.0.1
AMD	AMD Ryzen™ Embedded V2000	EmbeddedPI-FP6 1.0.0.9
AMD	AMD Ryzen™ Embedded V3000	Embedded-PI FP7r2 1.0.0.9

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-02-11T22:24:02.153Z
• Last modified: 2026-02-26T19:08:51.034Z

09References

• www.amd.com — https://www.amd.com/en/resources/product-security/bulletin/amd-sb-5004.html
• www.amd.com — https://www.amd.com/en/resources/product-security/bulletin/amd-sb-4008.html
• www.amd.com — https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3009.html