Use AMD. Wait for BIOS updates. 🚨

AMD has warned users of the Zen 5 family of CPUs to be aware of new vulnerabilities in the RDSEED command used to generate random numbers from hardware. This bug causes 16-bit and 32-bit RDSEED commands to restore zero (0) when the system understands that they have succeeded. In fact, random numbers have not been generated, resulting in random values that should be fixed.

.

This can cause the creation of encryption keys or random-dependent processes to be less secure, because the resulting numbers can be guessed and open up a channel for hackers to use to break through the system or trap data more easily.

.

This vulnerability is documented in AMD-SB-7055 code and CVE-2025-62626 number, has a high severity level (CVSS 7.2/10 points). AMD states that this problem only hits 16-bit and 32-bit RDSEEDs, while the 64-bit version remains safe, not affected.

.

The root of the problem was discovered by an engineer from Meta who observed abnormal behavior and reported it in the Linux Kernel Mailing List before AMD came out to officially confirm it. The Linux community has now issued a temporary patch to disable RDSEED on Zen 5 first, to avoid the risk pending an update from AMD.

.

Affected CPUs include both the Ryzen 9000, Ryzen AI 300, Threadripper 9000, and Ryzen Z2, as well as server sides like the EPYC 9005 that have already been updated, fixed. For the general user model, AMD prepares to release the fix update through AGESA firmware in late November 2025 and will gradually cover it through early 2026.

.

In the meantime, AMD recommends avoiding 16-bit and 32-bit RDSEED by switching to 64-bit instead or using software-side random systems temporarily. For Linux users, it is possible to install patches that disable RDSEED for safety.

.

While this problem does not directly affect the general user, for systems that rely on hardware randomness, such as encryption, identity verification, or enterprise security, it is important not to overlook. It is recommended to check the BIOS or UEFI update from the motherboard manufacturer and update immediately when a new version comes out.

.

Source: tomshardware, AMD

# IT News # Includes IT matters # Cough to know # IT