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CVE-2025-68313: x86/CPU/AMD: Add RDSEED fix for Zen5

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-16 · updated 2026-10-15

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 kernel: from 6.6.156 before 6.7; 6.8 — fixed in 6.18, 6.7

How to fix

Upgrade to a fixed version: Linux kernel 6.18, 6.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/36ff93e66d0efc46e39fab536a9feec968daa766
• https://git.kernel.org/stable/c/607b9fb2ce248cc5b633c5949e0153838992c152
• https://git.kernel.org/stable/c/e980de2ff109dacb6d9d3a77f01b27c467115ecb

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