x86/CPU/AMD: Add RDSEED fix for Zen5

Answer in brief

CVE-2025-68313 records a Unknown severity vulnerability in x86/CPU/AMD: Add RDSEED fix for Zen5. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Dec 16, 2025Updated Sep 2, 2026Source checked Sep 2, 2026First seen by HOL Sep 2, 2026Material review Sep 2, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=3e4147f33f8b647775357bae0248b9a2aeebfcd2 <e980de2ff109dacb6d9d3a77f01b27c467115ecb \|\| >=3e4147f33f8b647775357bae0248b9a2aeebfcd2 <36ff93e66d0efc46e39fab536a9feec968daa766 \|\| >=3e4147f33f8b647775357bae0248b9a2aeebfcd2 <607b9fb2ce248cc5b633c5949e0153838992c152 \|\| 5953e7a89966fc5a42124a08ba33a9c57ba5173c \|\| >=6.6.156 <6.7	e980de2ff109dacb6d9d3a77f01b27c467115ecb, 36ff93e66d0efc46e39fab536a9feec968daa766, 607b9fb2ce248cc5b633c5949e0153838992c152, 6.7
Linux/Linuxgeneric	6.8	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to e980de2ff109dacb6d9d3a77f01b27c467115ecb if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Dec 16, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 2, 2026

Sources and claim methodology

Upstream source 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. ]

Quoted source text, attributed separately from HOL analysis.