Bug 2422831 (CVE-2025-68313) - CVE-2025-68313 kernel: x86/CPU/AMD: Add RDSEED fix for Zen5
Summary: CVE-2025-68313 kernel: x86/CPU/AMD: Add RDSEED fix for Zen5
Keywords:
Status: NEW
Alias: CVE-2025-68313
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-16 16:04 UTC by OSIDB Bzimport
Modified: 2025-12-16 17:52 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2025-12-16 16:04:53 UTC 
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. ]
Comment 1 Alexander B 2025-12-16 17:49:47 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121654-CVE-2025-68313-c65d@gregkh/T
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