SB2025122706 - Lenovo update for RDSEED Failure on AMD Zen 5 processors
Published: December 27, 2025
Security Bulletin ID
SB2025122706
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Insufficient Entropy (CVE-ID: CVE-2025-62626)
CWE-ID: CWE-331 - Insufficient Entropy
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to insufficient entropy in Zen 5 processors, which causes the RDSEED instruction to return 0 at a rate inconsistent with randomness while incorrectly signaling success (CF=1), indicating a potential misclassification of failure as success. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.