Home/CVE/Execution unit scheduler contention may lead to a side channel vulnerability found on AMD CPU microarchitectures codenam
CVE

CVE-2021-46778

Execution unit scheduler contention may lead to a side channel vulnerability found on AMD CPU microarchitectures codenam

Execution unit scheduler contention may lead to a side channel vulnerability found on AMD CPU microarchitectures codenamed “Zen 1”, “Zen 2” and “Zen 3” that use simultaneous multithreading (SMT). By measuring the contention level on scheduler queues an attacker may potentially leak sensitive information.

MEDIUM · CVSS 5.6 EPSS 0.0012
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
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Weakness Classification

CWE-203Observable Discrepancy
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Affected Products & Versions

60
amd athlon 3050ge firmwareall versions
amd athlon 3150g firmwareall versions
amd athlon 3150ge firmwareall versions
amd epyc 7001 firmwareall versions
amd epyc 7002 firmwareall versions
amd epyc 7003 firmwareall versions
amd epyc 7232p firmwareall versions
amd epyc 7251 firmwareall versions
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Scoring & Timeline

5.6
MEDIUM · CVSS v3.1 · psirt@amd.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Aug 2022 · 08:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1039Vendor Advisory
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