wikiSafety instructions for AMD-SB-7055
On October 23rd, 2025, AMD published the Security Bulletin AMD-SB-7055 [1]. AMD was informed via bug in „Zen 5”-processors, which can cause the RDSEED instruction to output 0 at a non-random rate while falsely signaling success (CF=1). This problem has originally been published via Linux-Kernel mailing list and not via Coordinated Vulnerability Disclosure (CVD) process from AMD. AMD has found out that the 16-bit and 32-bit forms of RDSEED are affected on “Zen 5” processors. The 64-bit form of RDSEED is not affected.
Affected systems
AMD EPYC systems:
- systems with "Zen 5" AMD EPYC 9005 Turin processors
AMD Threadripper systems:
- systems with AMD Ryzen Threadripper 9000 / PRO 9000WX processors
Solution for the problem
Here is a tabular chart of the corresponding CVEs and AGESA / firmware-updates for the correction for the respective EPYC-generation, if available.
AMD EPYC 9005 Turin:
| security vulnerability | risk potential | AGESA version | µcode |
|---|---|---|---|
| CVE-2025-62626 | 7.2 (Hoch) | AGESA TurinPI 1.0.0.8 | Turin C1 : 0x0B00215A
Turin Dense B0: 0x0B101054 |
AMD Ryzen Threadripper 9000 / PRO 9000WX:
| security vulnerability | risk potential | correction | publication target |
|---|---|---|---|
| CVE-2025-62626 | 7.2 (Hoch) | outstanding | late November 2025 |
Updates for products of Thomas-Krenn
Updates for the corresponding system can be found in the download area of Thomas-Krenn. The updates in the download area have been tested by us to guarantee the stability and compatibility of our systems.
If you require the latest version for your system and it is not yet available in our download area, you can get it at Asus or Supermicro.
References
- ↑ RDSEED Failure on AMD “Zen 5” Processors (www.amd.com/en/resources/product-security)
 |
Author: Thomas-Krenn.AG At Thomas-Krenn.AG we pay attention to the best possible service. To do justice to this, we have created our Thomas-Krenn Wiki. Here we share our knowledge with you and inform you about basics and news from the IT world. You like our knowledge culture and want to become part of the team? Visit our job offers.
|
 |
Translator: Alina Ranzinger Alina has been working at Thomas-Krenn.AG since 2024. After her training as multilingual business assistant, she got her job as assistant of the Product Management and is responsible for the translation of texts and for the organisation of the department.
|
