AMD CPU Microcode Signature Verification Vulnerability

AMD ID:  AMD-SB-7033
Potential Impact: Loss of integrity of x86 instruction execution, loss of confidentiality and integrity of data in x86 CPU privileged context and compromise of SMM execution environment
Severity: Medium

Summary

Researchers from Google® have provided AMD with a report titled “AMD Microcode Signature Verification Vulnerability.” This vulnerability may allow an attacker with system administrative privilege to load malicious CPU microcode patches. In the report, the researchers describe how they were able to load patches that were not signed by AMD. The researchers also demonstrate how they falsified signatures for arbitrary microcode patches.

AMD has not received any reports of this attack occurring in any system.

AMD believes this issue is caused by a weakness in signature verification algorithm that could allow an administrator privileged attacker to load arbitrary microcode patches. AMD plans to issue mitigations to fix this issue. Please see below for additional details.

CVE Details

Refer to Glossary for explanation of terms

CVE CVSS Score CVE Description
CVE-2024-36347 6.4 (Medium)
AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Improper signature verification in AMD CPU ROM microcode patch loader may allow an attacker with local administrator privilege to load malicious microcode, potentially resulting in loss of integrity of x86 instruction execution, loss of confidentiality and integrity of data in x86 CPU privileged context and compromise of SMM execution environment.

Affected Products and Mitigation 

AMD plans to release to the Original Equipment Manufacturers (OEM) the Platform Initialization (PI) firmware versions on the target dates listed below. Please contact your OEM for the BIOS update specific to your product(s).

Data Center

To confirm the recommended mitigation is installed, you can verify by referring to the microcode version(s) listed below each PI version.

Code Name Family CPUID
Naples AMD EPYC™ 7000 Series 0x00800F12
Rome AMD EPYC™ 7002 Series 0x00830F10
Milan AMD EPYC™ 7003 Series 0x00A00F11
Milan-X AMD EPYC™ 7003 Series 0x00A00F12
Genoa AMD EPYC™ 9004 Series 0x00A10F11
Genoa-X AMD EPYC™ 9004 Series 0x00A10F12
Bergamo/Siena AMD EPYC™ 9004 Series 0x00AA0F02
Raphael AMD EPYC™ 4004 Series 0x00A60F12
Turin AMD EPYC™ 9005 Series 0x00B00F21

Mitigation (Minimum Versions)

CVE AMD EPYC™ 7001 Series “Naples” AMD EPYC™ 7002 Series “Rome” AMD EPYC™ 7003 Series “Milan” AMD EPYC™ 9004 Series “Genoa”
CVE-2024-36347 6.4 (Medium) Naples B2 ucode:
0x08001278

Delivered in NaplesPI
1.0.0.P1
(Release: 2024-12-13)
Rome B0 ucode:
0x0830107D

Delivered in RomePI
1.0.0.L1
(Release: 2024-12-13)
uCode; Milan :
0x0A0011DB
Milan-X : 0x0A001244

Delivered in : MilanPI
1.0.0.F2
(Release: 2024-12-13)
uCode Genoa: 0x0A101154
Genoa-X: 0x0A10124F
Bergamo/Siena: 0x0AA00219

Delivered in: Genoa
1.0.0.E3
(Release: 2024-12-16)
  1. Microcode cannot be hot-loaded after updating to this PI version.
  2. Minimum MilanPI_1.0.0.F is required to allow for hot-loading future microcode versions higher than those listed in the PI. #GP fault will occur if attempting to hot load microcode on older BIOS.
  3. Minimum GenoaPI_1.0.0.E is required to allow for hot-loading future microcode versions higher than those listed in the PI. #GP fault will occur if attempting to hot load microcode on older BIOS.

 

CVE Mitigation (Minimum Versions)
AMD EPYC™ 4004 Series “Raphael” AMD EPYC™ 9005 Series “Turin”
CVE-2024-36347 6.4 (Medium) ComboAM5PI
1.0.0.a
(Release: 2025-01-07)

ComboAM5PI
1.0.0.4
(Release: Jan’25)

ComboAM5PI
1.2.0.3
(Release: 2025-01-08)
Ucode Turin: 0x0B002147
TurinPI
1.0.0.44
(Release: 2025-03-04)
  1. Minimum TurinPI_1.0.0.4 is required to allow for hot-loading future microcode versions higher than those listed in the PI. #GP fault will occur if attempting to hot load microcode on older BIOS.
DATA CENTER GRAPHICS

AMD recommends updating to the Platform Initialization (PI) firmware versions indicated below.

CVE AMD Instinct™ MI300A
CVE-2024-36347 6.4 (Medium) MI300PI_SR5
1.0.0.8
(2025-01-14)
CLIENT

AMD recommends updating to the Platform Initialization (PI) firmware versions indicated below

DESKTOP
CVE AMD Ryzen™ 5000 Series Desktop Processors
(Formerly codenamed)
“Vermeer” AM4
AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics
(Formerly codenamed)
“Cezanne” AM4
AMD Ryzen™ 3000 Series Desktop Processors
(Formerly codenamed)
“Matisse” AM4
AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics
(Formerly codenamed)
“Picasso” AM4
CVE-2024-36347 6.4 (Medium) ComboAM4v2PI
1.2.0.E
(2025-01-22)
ComboAM4v2PI
1.2.0.EX
(2025-01-22)
ComboAM4PI
1.0.0.D
(2025-01-14)

ComboAM4v2PI
1.2.0.E
(2025-01-22)
ComboAM4PI
1.0.0.D
(2025-01-14)

ComboAM4v2PI
1.2.0.E
(2025-01-22)

 

CVE AMD Ryzen™ 7000 Series Desktop Processors
(Formerly codenamed)
“Raphael” X3D
AMD Ryzen™ 4000 Series Desktop Processor with Radeon™ Graphics
(Formerly codenamed)
“Renoir” AM4
AMD Ryzen™ 8000 Series Processor with Radeon™ Graphics
(Formerly codenamed)
“Phoenix” AM5
AMD Ryzen™ 9000 Series Desktop Processors
(Formerly codenamed
“Granite Ridge”
CVE-2024-36347 6.4 (Medium) ComboAM5PI
1.0.0.a
(2025-01-07)

ComboAM5PI
1.1.0.3c
(2025-01-27)

ComboAM5PI
1.2.0.3
(2025-01-08)
ComboAM4v2PI
1.2.0.E
(2025-01-22)
ComboAM5PI
1.1.0.3c
(2025-01-27)

ComboAM5PI
1.2.0.3
(2025-01-08)
ComboAM5PI
1.2.0.3c
(2025-03-27)
HIGH END DESKTOP (HEDT)
CVE AMD Ryzen™ Threadripper™ 3000 Series Processors
(Formerly codenamed)
“Castle Peak” HEDT
AMD Ryzen™ Threadripper™ PRO 7000 WX-Series Processors
(Formerly codenamed)
“Storm Peak”
CVE-2024-36347 6.4 (Medium) CastlePeakPI-SP3r3
1.0.0.E
(2024-12-30)
StormPeakPI-SP6
1.0.0.1k
(2024-12-19)

StormPeakPI-SP6
1.1.0.0i
(2024-12-16)
WORKSTATION
CVE AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors
(Formerly codenamed)
“Castle Peak” WS SP3
AMD Ryzen™ Threadripper™ PRO 5000WX- Series Desktop Processors
(Formerly codenamed)
“Chagall” WS
CVE-2024-36347 6.4 (Medium) ChagallWSPI-sWRX8
1.0.0.B
(2024-12-23)

CastlePeakWSPI-sWRX8
1.0.0.g
(2024-12-30)
ChagallWSPI-sWRX8
1.0.0.B
(2024-12-23)
MOBILE - AMD Athlon™ Series Processors
CVE AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics
(Formerly codenamed)
“Dali”/”Dali” FP5
CVE-2024-36347 6.4 (Medium) PicassoPI-FP5
1.0.1.2b
(2025-02-17)
MOBILE – AMD Ryzen™ Series
CVE AMD Ryzen™ 3000 Series Mobile Processor with Radeon™ Graphics
(Formerly codenamed)
“Picasso” FP5
AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics
(Formerly codenamed)
“Renoir” FP6
AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics
(Formerly codenamed)
“Lucienne” FP6
CVE-2024-36347 6.4 (Medium) PicassoPI-FP5
1.0.1.2b
(2025-02-17)
RenoirPI-FP6
1.0.0.Eb
(2025-01-14)
CezannePI-FP6
1.0.1.1b
(2024-12-27)

 

CVE AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics
(Formerly codenamed)
“Cezanne” FP6
 
AMD Ryzen™ 7020 Series Processors with Radeon™ Graphics
(Formerly codenamed)
“Mendocino” FT6
CVE-2024-36347 6.4 (Medium) CezannePI-FP6
1.0.1.1b
(2024-12-27)
MendocinoPI-FT6
1.0.0.7b
(2025-01-07)

 

CVE AMD Ryzen™ 6000 Series Processor with Radeon™ Graphics
(Formerly codenamed)
"Rembrandt" FP7
AMD Ryzen™ 7035 Series Processor with Radeon™ Graphics
(Formerly codenamed)
“Rembrandt R”
AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics
(Formerly codenamed)
“Barcelo” FP6
AMD Ryzen™ 7000 Series Processors with Radeon™ Graphics
(Formerly codenamed)
“Barcelo R” FP6
CVE-2024-36347 6.4 (Medium) RembrandtPI-FP7
1.0.0.Bb
(2024-12-26)
RembrandtPI-FP7
1.0.0.Bb
(2024-12-26)
CezannePI-FP6
1.0.1.1b
(2024-12-27)
CezannePI-FP6
1.0.1.1b
(2024-12-27)

 

CVE

AMD Ryzen™ 7040 Series Processors with Radeon™ Graphics
(Formerly codenamed)
“Phoenix”
FP7/FP7r2/FP8
AMD Ryzen™ 8040 Series Mobile Processors with Radeon™ Graphics
(Formerly codenamed)
“Hawk Point”
FP7/FP7r2/FP8
AMD Ryzen™ 7045 Series Mobile Processors
(Formerly codenamed)
“Dragon Range” FL1
CVE-2024-36347 6.4 (Medium) PhoenixPI-FP8-FP7
1.2.0.0
(2024-12-16)
PhoenixPI-FP8-FP7
1.2.0.0
(2024-12-16)
DragonRangeFL1
1.0.0.3g
(2024-12-18)

 

CVE AMD Ryzen™ AI 300 Series
(Formerly codenamed)
“StrixKracken”
AMD Ryzen™ AI Max+
(Formerly codenamed)
“StrixHalo”
FP7/FP7r2/FP8
AMD Ryzen™ 9000HX Series Mobile Processors
(formerly codenamed)
"Fire Range"
CVE-2024-36347 6.4 (Medium) StrixKrackenPI-FP8
1.1.0.0b
(2025-03-26)
StrixHaloPI-FP11
1.0.0.1
(2025-03-20)
FireRangeFL1PI
1.0.0.0a
(2025-04-23)
EMBEDDED

AMD recommends updating to the Platform Initialization (PI) firmware versions indicated below

CVE AMD EPYC™ Embedded 3000 AMD EPYC™ Embedded 7002 AMD EPYC™ Embedded 7003
CVE-2024-36347 6.4 (Medium) SnowyOwl PI
1.1.0.E
(2024-12-18)
EmbRomePI-SP3
1.0.0.D
(2024-12-19)
EmbMilan PI-SP3
1.0.0.A
(2024-12-19)

 

CVE AMD EPYC™Embedded 8004 AMD EPYC™ Embedded 9004 AMD EPYC™ Embedded 97X4
CVE-2024-36347 6.4 (Medium) EmbGenoaPI-SP5
1.0.0.9
(2024-12-24)
EmbGenoaPI-SP5
1.0.0.9
(2024-12-24)
EmbGenoaPI-SP5
1.0.0.9
(2024-12-24)

 

CVE AMD Ryzen™ Embedded R1000 AMD Ryzen™ Embedded R2000 AMD Ryzen™ Embedded 5000 AMD Ryzen™ Embedded 7000
CVE-2024-36347 6.4 (Medium) EmbeddedPI-FP5
1.2.0.F
(2025-02-28)
EmbeddedR2KPI
1.0.0.5
(2025-02-28)
EmbAM4PI
1.0.0.7
(2025-02-05)
EmbeddedAM5PI
1.0.0.3
(2025-02-05)

 

CVE   AMD Ryzen™ Embedded V1000 AMD Ryzen™ Embedded V2000 AMD Ryzen™ Embedded V3000
All V1000 OPNs excluding YE1500C4T4MFH YE1500C4T4MFH
CVE-2024-36347 6.4 (Medium) EmbeddedPI-FP5
1.2.0.F
(2025-02-28)
EmbeddedPI-FP5
1.2.0.F;
(2025-02-28)
EmbeddedPI-FP6
1.0.0.B
(2025-01-31)
EmbeddedPI-FP7R2
1.0.0.C
(2024-12-27)

Acknowledgement

AMD thanks Josh Eads, Kristoffer Janke, Eduardo’ Vela” Nava, Tavis Ormandy and Matteo Rizzo from Google® for submitting the report and engaging in coordinated vulnerability disclosure. 

Revisions 

Revision Date Description
2025-06-03 Corrected program names for “StrixKracken” and “StrixHalo”
Corrected mitigated version for “StrixKracken”
2025-04-07 Added mitigations for Embedded processors.
Added “Zen5” processors as affected products.
Corrected CVE ID in the Server product table.
2025-03-05 Initial publication

DISCLAIMER

The information contained herein is for informational purposes only and is subject to change without notice. While every precaution has been taken in the preparation of this document, it may contain technical inaccuracies, omissions and typographical errors, and AMD is under no obligation to update or otherwise correct this information. Advanced Micro Devices, Inc. makes no representations or warranties with respect to the accuracy or completeness of the contents of this document, and assumes no liability of any kind, including the implied warranties of noninfringement, merchantability or fitness for particular purposes, with respect to the operation or use of AMD hardware, software or other products described herein. Any computer system has risks of security vulnerabilities that cannot be completely prevented or mitigated. No license, including implied or arising by estoppel, to any intellectual property rights is granted by this document. Terms and limitations applicable to the purchase or use of AMD’s products are as set forth in a signed agreement between the parties or in AMD's Standard Terms and Conditions of Sale.

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