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) |
- Microcode cannot be hot-loaded after updating to this PI version.
- 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.
- 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) |
- 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.E (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 Max+ (Formerly codenamed) “StrixKrackan” |
AMD Ryzen™ AI 300 Series (Formerly codenamed) “StrixHalo” FP7/FP7r2/FP8 |
AMD Ryzen™ 9000HX Series Mobile Processors (formerly codenamed) "Fire Range" |
|
CVE-2024-36347 |
6.4 (Medium) |
StrixKrackanPI-FP8 1.1.0.1b (2025-03-26) |
StrixHaloPI-FP11 1.0.0.1 (2025-03-20) |
Target release April 2025 |
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 |
| 2025-04-07 | Added mitigations for Embedded processors. Added “Zen5” processors as affected products. Corrected CVE ID in the Server product table. |
2025-03-05 |
Initial publication |
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