CVE-2024-21977

Published Sep 5, 2025 CVSS 3.1 · 3.2 Low EPSS < 1% KEV · Not listed
Description
Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-19583 Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.
History
Type Values Removed Values Added
First Time appeared Amd
Amd epyc
Amd epyc 7003
Amd epyc 8004
Amd epyc 9004
Amd epyc Embedded 7003
Amd epyc Embedded 9004
Amd ryzen 5000 Series Desktop Processors
Amd ryzen 5000 Series Mobile Processors With Radeon Graphics
Amd ryzen 6000 Series Processors With Radeon Graphics
Amd ryzen 7000 Series Desktop Processors
Amd ryzen 7030 Series Mobile Processors With Radeon Graphics
Vendors & Products Amd
Amd epyc
Amd epyc 7003
Amd epyc 8004
Amd epyc 9004
Amd epyc Embedded 7003
Amd epyc Embedded 9004
Amd ryzen 5000 Series Desktop Processors
Amd ryzen 5000 Series Mobile Processors With Radeon Graphics
Amd ryzen 6000 Series Processors With Radeon Graphics
Amd ryzen 7000 Series Desktop Processors
Amd ryzen 7030 Series Mobile Processors With Radeon Graphics
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.
Weaknesses CWE-459
References
Metrics cvssV3_1

{'score': 3.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N'}