Vulnerability in Linux Kernel Affecting AMD Zen5 Processors
CVE-2025-68313

Currently unrated

Key Information:

Vendor

Linux

Status
Vendor
CVE Published:
16 December 2025

What is CVE-2025-68313?

A vulnerability has been identified in the Linux kernel, particularly affecting AMD Zen5 processors. This issue pertains to the RDSEED instruction, which is designed to provide random values. Unfortunately, in specific scenarios, the instruction returns a constant value of 0 too frequently, misleadingly indicating a successful operation. This inconsistency raises significant concerns regarding the reliability of randomness output from the processor, potentially undermining cryptographic operations and overall system security. A recent update has introduced checks for microcode revisions to address this problem effectively. For further technical details, refer to AMD-SB-7055 and related documentation.

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Affected Version(s)

Linux 3e4147f33f8b647775357bae0248b9a2aeebfcd2

Linux 3e4147f33f8b647775357bae0248b9a2aeebfcd2 < 36ff93e66d0efc46e39fab536a9feec968daa766

Linux 3e4147f33f8b647775357bae0248b9a2aeebfcd2 < 607b9fb2ce248cc5b633c5949e0153838992c152

References

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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