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.

Score

CVSS 3.1 6.2 Medium

Status

Analyzed - psirt@us.ibm.com

Published

2026-08-19

Last modified

2026-08-20

Weaknesses

CWE-331

Affected products

• Power System E1050 (9043-mrx) Firmware (Ibm)
• Power System E1080 (9080-hex) Firmware (Ibm)
• Power System E1150 (9043-mru) Firmware (Ibm)
• Power System E1180 (9080-heu) Firmware (Ibm)
• Power System E950 (9040-mr9) Firmware (Ibm)
• Power System E980 (9080-m9s) Firmware (Ibm)
• Power System H922 (9223-22s) Firmware (Ibm)
• Power System H924 (9223-42s) Firmware (Ibm)
• Power System L1022 (9786-22h) Firmware (Ibm)
• Power System L1024 (9786-42h) Firmware (Ibm)
• Power System L1122 (9856-22h) Firmware (Ibm)
• Power System L1124 (9856-42h) Firmware (Ibm)
• Power System S1012 (9028-21b) Firmware (Ibm)
• Power System S1014 (9105-41b) Firmware (Ibm)
• Power System S1022 (9105-22a) Firmware (Ibm)
• Power System S1022s (9105-22b) Firmware (Ibm)
• Power System S1024 (9105-42a) Firmware (Ibm)
• Power System S1112 (9242-21b) Firmware (Ibm)
• Power System S1112 (9242-21t) Firmware (Ibm)
• Power System S1114 (9824-41b) Firmware (Ibm)
• Power System S1122 (9824-22a) Firmware (Ibm)
• Power System S1122s (9824-22b) Firmware (Ibm)
• Power System S1124 (9824-42a) Firmware (Ibm)
• Power System S914 (9009-41g) Firmware (Ibm)
• Power System S922 (9009-22g) Firmware (Ibm)
• Power System S924 (9009-42g) Firmware (Ibm)
• Power Systems Firmware (Ibm)

References

• https://www.ibm.com/support/pages/node/7283890