CVE-2026-4936
MediumCVSS 5.1Summary
IBM PowerVM Hypervisor Platform KeyStore (PKS) and virtual TPM in certain firmware versions use persistent storage key seeds that result in an AES key with reduced strength. An attacker with access to the service processor or HMC can exploit this to derive the encryption key and access data.
Risk Assessment
Someone with access to the service processor or HMC can decrypt data, potentially leading to confidentiality and integrity breaches.
Recommendation
Update IBM PowerVM firmware to a version that does not contain this vulnerability.
Original NVD description (English source)
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.