CVE-2023-31315

Once firmware sets the SMM lock, the registers that place and protect SMRAM should be read-only. Enrique Nissim and Krzysztof Okupski of IOActive found that a model-specific register was not validated, so code at ring 0 could still change the SMM configuration and run code of its own in System Management Mode. AMD’s bulletin covers EPYC from the first to the fourth generation, Instinct MI300A, the embedded lines and Ryzen and Threadripper client parts back to the Ryzen 2000 series. The fix is PI firmware from the board maker; for EPYC AMD also lists microcode that can be loaded at run time.

Affected processors

5 of the 5 microarchitectures listed are affected in all or some of their models.

Microarchitecture	Status	Detail	Source
Zen	Affected	EPYC 7001 (Naples), Ryzen 2000G (Raven Ridge), Athlon 3000 mobile, EPYC Embedded 3000, Ryzen Embedded R1000 and V1000	amd.com
Zen+	Affected	Ryzen 2000 desktop (Pinnacle Ridge), Ryzen Embedded R2000	amd.com
Zen 2	Affected	EPYC 7002 (Rome), Ryzen 3000 desktop (Matisse), Ryzen 4000 (Renoir), Ryzen 5000 mobile (Lucienne), Ryzen 7020 (Mendocino), Threadripper 3000 and PRO 3000 WX, EPYC Embedded 7002, Ryzen Embedded V2000	amd.com
Zen 3	Affected	EPYC 7003 (Milan), Ryzen 5000 (Vermeer, Cezanne, Barcelo), Ryzen 6000 and 7035 (Rembrandt), Threadripper PRO 5000 WX, EPYC Embedded 7003, Ryzen Embedded 5000 and V3000	amd.com
Zen 4	Affected	EPYC 9004 and 8004 (Genoa, Bergamo, Siena), Ryzen 7000 desktop (Raphael), Ryzen 7040 and 8040 (Phoenix, Hawk Point), Ryzen 7045 (Dragon Range), Threadripper 7000 (Storm Peak), EPYC Embedded 9004, Ryzen Embedded 7000	amd.com

Mitigations

• Firmware: PI firmware: NaplesPI 1.0.0.M, RomePI 1.0.0.J, MilanPI 1.0.0.D, GenoaPI 1.0.0.C, and the client and embedded PI versions the bulletin lists, from 2024. Source.
• Microcode: Hot-loadable microcode for EPYC dated 2024-05-03: 0x0800126F (Naples), 0x0830107C (Rome), 0x0A0011D5 (Milan), 0x0A101148 (Genoa). Source.

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