High · published August 20, 2026
IBM Power Systems Firmware FW950.00 through FW950.H2, OP940.00 through OP940.a1 (Power9), and OP940.00 - OP940.81 (Power HMC) is affected by a vulnerability in host firmware NVRAM parsing. An attacker with root access to a guest partition on an OpenPOWER system can write a specially crafted NVRAM image, causing the host firmware boot stage to crash with possible memory corruption. This condition persists until operator intervention — clearing NVRAM via the service processor — to restore normal operation. This vulnerability only affects OpenPOWER systems; systems running PowerVM are not affected. Successful exploitation results in an integrity and availability impact to the managed system.
| Product | Versions | Fixed in |
|---|---|---|
| ibm/power_system_s922_\(9009-22g\)_firmware | ≥ fw950.00, < fw950.h3 | fw950.h3 |
| ibm/power_system_h922_\(9223-22s\)_firmware | ≥ fw950.00, < fw950.h3 | fw950.h3 |
| ibm/power_system_s914_\(9009-41g\)_firmware | ≥ fw950.00, < fw950.h3 | fw950.h3 |
| ibm/power_system_s924_\(9009-42g\)_firmware | ≥ fw950.00, < fw950.h3 | fw950.h3 |
| ibm/power_system_h924_\(9223-42s\)_firmware | ≥ fw950.00, < fw950.h3 | fw950.h3 |
| ibm/power_system_e950_\(9040-mr9\)_firmware | ≥ fw950.00, < fw950.h3 | fw950.h3 |
| ibm/power_system_e980_\(9080-m9s\)_firmware | ≥ fw950.00, < fw950.h3 | fw950.h3 |
| ibm/power_system_ac922_\(8335-gth\)_firmware | ≥ op940, < op940.a2 | op940.a2 |
| ibm/power_system_ac922_\(8335-gtx\)_firmware | ≥ op940, < op940.a2 | op940.a2 |
| ibm/power_hardware_management_console_\(7063-cr2\)_firmware | ≥ op940, < op940.82 | op940.82 |