Supermicro is aware of the security issue that occurs due to inadequate access controls, which fail to prevent the hypervisor from setting an internal configuration bit. This attack could allow a malicious hypervisor to manipulate the configuration of the CPU pipeline, potentially resulting in corruption of the stack pointer inside an SEV-SNP guest running on the sibling simultaneous multithreading (SMT) thread. AMD has released mitigations for this vulnerability. This vulnerability affects BIOS in Supermicro H12, H13 and H14 products.
CVE:
- CVE-2025-29943
- Severity: Low
Findings:
Improper access control within AMD CPUs may allow an admin-privileged attacker to modify the configuration of the CPU pipeline, potentially resulting in the corruption of the stack pointer inside an SEV-SNP guest.
Affected products:
Supermicro BIOS on the server H12, H13 and H14 motherboards.
| AMD Motherboard Generation | BIOS Version with Fix |
|---|---|
| H12 – H12SSW-AN6 – EPYC™ 7002/7003 series | v 3.4 |
| H12 – H12SSW-iNR/NTR – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12SSW-iNL/NTL – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12DSG-O-CPU – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12DST-B – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12SST-PS – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12SSW-iN/NT – EPYC™ 7002/7003 series | v 3.5 |
| H12 – BH12SSi-M25 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12DSU-iN – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12SSFF-AN6 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12SSL-i/C/CT/NT – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12DSi-N6/NT6 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12SSFR-AN6 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12DSG-Q-CPU6 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12SSG-AN6 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12DGQ-NT6 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12SSG-ANP6 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12DGO-6 – EPYC™ 7002/7003 series | v 3.5 |
| H12 – H12DSU-iNR – EPYC™ 7002/7003 series | v 3.5 |
| H13 – H13SVW-N/NT – EPYC™ 8004 series | v 1.5 |
| H13 – H13SSW – EPYC™ 9004/9005 series | v 3.7 |
| H13 – H13DSH – EPYC™ 9004/9005 series | v 3.7a |
| H13 – H13DSG-O-CPU – EPYC™ 9004/9005 series | v 3.8 |
| H13 – H13SST-G/GC – EPYC™ 9004/9005 series | v 3.5 |
| H13 – H13SSL-N/NT – EPYC™ 9004/9005 series | v 3.7 |
| H13 – H13SSH – EPYC™ 9004/9005 series | v 3.7b |
| H13 – H13DSG-O-CPU-D – EPYC™ 9004 series | v 3.7a |
| H13 – H13SSF – EPYC™ 9004/9005 series | v 3.7a |
| H13 – H13DSG-OM – EPYC™ 9004/9005 series | v 3.7a |
| H14 – H14DSH – EPYC™ 9004/9005 series | v 1.7a |
| H14 – H14SST-G – EPYC™ 9004/9005 series | v 1.7a |
| H14 – H14SST-GE – EPYC™ 9005 series | v 1.0 |
| H14 – H14DSG-OD – EPYC™ 9004/9005 series | v 1.7a |
| H14 – H14SHM – EPYC™ 9004/9005 series | v 1.7 |
| H14 – H14DST-F/FL – EPYC™ 9005 series | v 1.7 |
| H14 – H14DSG-O-CPU – EPYC™ 9004/9005 series | v 1.7a |
| H14 – H14SSL-N/NT – EPYC™ 9004/9005 series | v 1.7 |
| H14 – H14DSG-OM – EPYC™ 9004/9005 series | v 1.1b |
Remediation:
- All affected Supermicro motherboard SKUs will require a BIOS update to mitigate this potential vulnerability.
- Updated BIOS firmware has been created to mitigate this potential vulnerability. Supermicro is currently testing and validating affected products. Please check Release Notes for the resolution.