CVE-2026-16661

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can exploit this vulnerability, allowing arbitrary code to be executed in the host firmware runtime, giving full control over the managed system, resulting in a confidentiality, integrity, and availability impact to the managed system. It has a CVSS v3.1 base score of 8.2 (HIGH).

CVE-2026-16661 has a CVSS v3.1 score of 8.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

CVE-2026-16661 affects products from ibm, specifically: power_system_e1050_\(9043-mrx\), power_system_e1050_\(9043-mrx\)_firmware, power_system_e1080_\(9080-hex\), power_system_e1080_\(9080-hex\)_firmware, power_system_e1150_\(9043-mru\), power_system_e1150_\(9043-mru\)_firmware, power_system_e1180_\(9080-heu\), power_system_e1180_\(9080-heu\)_firmware, power_system_e950_\(9040-mr9\), power_system_e950_\(9040-mr9\)_firmware, power_system_e980_\(9080-m9s\), power_system_e980_\(9080-m9s\)_firmware, power_system_h922_\(9223-22s\), power_system_h922_\(9223-22s\)_firmware, power_system_h924_\(9223-42s\), power_system_h924_\(9223-42s\)_firmware, power_system_l1022_\(9786-22h\), power_system_l1022_\(9786-22h\)_firmware, power_system_l1024_\(9786-42h\), power_system_l1024_\(9786-42h\)_firmware, power_system_l1122_\(9856-22h\), power_system_l1122_\(9856-22h\)_firmware, power_system_l1124_\(9856-42h\), power_system_l1124_\(9856-42h\)_firmware, power_system_s1012_\(9028-21b\), power_system_s1012_\(9028-21b\)_firmware, power_system_s1014_\(9105-41b\), power_system_s1014_\(9105-41b\)_firmware, power_system_s1022_\(9105-22a\), power_system_s1022_\(9105-22a\)_firmware, power_system_s1022s_\(9105-22b\), power_system_s1022s_\(9105-22b\)_firmware, power_system_s1024_\(9105-42a\), power_system_s1024_\(9105-42a\)_firmware, power_system_s1112_\(9242-21b\), power_system_s1112_\(9242-21b\)_firmware, power_system_s1112_\(9242-21t\), power_system_s1112_\(9242-21t\)_firmware, power_system_s1114_\(9824-41b\), power_system_s1114_\(9824-41b\)_firmware, power_system_s1122_\(9824-22a\), power_system_s1122_\(9824-22a\)_firmware, power_system_s1122s_\(9824-22b\), power_system_s1122s_\(9824-22b\)_firmware, power_system_s1124_\(9824-42a\), power_system_s1124_\(9824-42a\)_firmware, power_system_s914_\(9009-41g\), power_system_s914_\(9009-41g\)_firmware, power_system_s922_\(9009-22g\), power_system_s922_\(9009-22g\)_firmware, power_system_s924_\(9009-42g\), power_system_s924_\(9009-42g\)_firmware. Check the affected products table above for specific version ranges.

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.