CVE-2026-4936 MEDIUM

CVE-2026-4936: Power System Insufficient Entropy

Vendor Ibm
Product PowerVM Hypervisor
Weakness CWE-331
Published August 19, 2026
Last update August 20, 2026

CVSS base score

5.1/10
Attack vector Adjacent
Attack complexity High
Privileges required High
User interaction Required
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 19, 2026 CVE published
August 20, 2026 Record updated