Vulnerability in IBM Powervm Hypervisor
CVE-2026-4936
IBM PowerVM Hypervisor Platform KeyStore (PKS) and virtual TPM FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 use persistent storage key seeds that result in an AES key with reduced strength. An attacker with access to the service processor or HMC could exploit this weakness to derive the encryption key and access the data.
CVSS v3 metric
CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N.
Affected products
Weakness classification (CWE)
References
- psirt@us.ibm.com (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-4936?
- CVE-2026-4936 is a medium-severity vulnerability in IBM Powervm Hypervisor, classified under Insufficient Entropy. CVSS score: 5.1/10. Published 2026-08-19.
- How severe is CVE-2026-4936?
- Medium severity. CVSS v3 base score is 5.1 out of 10.