# CVE-2025-68313

## Summary

- **CVE ID:** CVE-2025-68313
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** N/A
- **Published:** Dec 16, 2025
- **Last Modified:** Sep 2, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

x86/CPU/AMD: Add RDSEED fix for Zen5

There's an issue with RDSEED's 16-bit and 32-bit register output
variants on Zen5 which return a random value of 0 "at a rate inconsistent
with randomness while incorrectly signaling success (CF=1)". Search the
web for AMD-SB-7055 for more detail.

Add a fix glue which checks microcode revisions.

  [ bp: Add microcode revisions checking, rewrite. ]

## Affected Products

- Linux — Linux (3e4147f33f8b647775357bae0248b9a2aeebfcd2)
- Linux — Linux (6.8)
- Linux — Linux (0)
- Linux — Linux (6.12.58)
- Linux — Linux (6.17.8)
- Linux — Linux (6.18)
- Linux — Linux (5953e7a89966fc5a42124a08ba33a9c57ba5173c)
- Linux — Linux (6.6.156)

## References

- [CNA](https://git.kernel.org/stable/c/e980de2ff109dacb6d9d3a77f01b27c467115ecb)
- [CNA](https://git.kernel.org/stable/c/36ff93e66d0efc46e39fab536a9feec968daa766)
- [CNA](https://git.kernel.org/stable/c/607b9fb2ce248cc5b633c5949e0153838992c152)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._