CVE-2026-4936

IBM PowerVM Hypervisor PKS and virtual TPM firmware (FW1110.00–.20, FW1060.00–.71, FW950.00–.H2) use weak persistent storage key seeds (CWE-331), allowing an attacker with service processor or HMC access to derive AES keys. Patch to FW1110.30, FW1060.72/80, or FW950.H3, then run sbmgr -regenerate...

CVE-2026-4936: Insufficient Entropy

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...

Security Bulletin: This Power System update is being released to address CVE-2026-4936

Summary PowerVM Platform KeyStore PKS and virtual TPM 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. Vulnerability Details...