CVE-2026-16661 PUBLISHED

Power System Integer Overflow

Assigner: ibm
Reserved: 22.07.2026 Published: 19.08.2026 Updated: 19.08.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 8.2

Product Status

Vendor IBM
Product PowerVM Hypervisor
Versions
  • Version FW1120.00 is affected
  • affected from FW1110.00 to FW1110.30 (incl.)
  • affected from FW1060.00 to FW1060.80 (incl.)
  • affected from FW950.00 to FW950.H2 (incl.)

Solutions

Customers with the products below should install FW1110.31(1110_134), FW1120.01(1120_167), or newer to remediate this vulnerability. Power 11

  • IBM Power System E1180 (9080-HEU)

Customers with the products below should install FW1110.31(1110_155), FW1120.01(1120_190), or newer to remediate this vulnerability. Power 11

  • IBM Power System S1122 (9824-22A)
  • IBM Power System S1124 (9824-42A)
  • IBM Power System S1122s (9824-22B)
  • IBM Power System S1114 (9824-41B)
  • IBM Power System L1122 (9856-22H)
  • IBM Power System L1124 (9856-42H)
  • IBM Power System E1150 (9043-MRU)

Customers with the products below should install FW1120.01(1120_190), or newer to remediate this vulnerability.

Power 11

  • IBM Power System S1112 (9242-21B, 9242-21T)

Customers with the products below should install FW1060.81(1060_184), or newer to remediate this vulnerability. Power 10

  • IBM Power System E1080 (9080-HEX)

Customers with the products below should install  FW1060.81(1060_191), or newer to remediate this vulnerability. Power 10

  • IBM Power System S1022 (9105-22A)
  • IBM Power System S1024 (9105-42A)
  • IBM Power System S1022s (9105-22B)
  • IBM Power System S1014 (9105-41B)
  • IBM Power System L1022 (9786-22H)
  • IBM Power System L1024 (9786-42H)
  • IBM Power System E1050 (9043-MRX)
  • IBM Power System S1012 (9028-21B)

Customers with the products below should install FW950.H3(950_230) or newer to remediate this vulnerability. Power 9

  • IBM Power System S922 (9009-22G)
  • IBM Power System H922 (9223-22S)
  • IBM Power System S914 (9009-41G)
  • IBM Power System S924 (9009-42G)
  • IBM Power System H924 (9223-42S)
  • IBM Power System E950 (9040-MR9)
  • IBM Power System E980 (9080-M9S)

The images mentioned above can be located at IBM Fix Central : https://www.ibm.com/support/fixcentral/ https://www.ibm.com/support/fixcentral/

References

Problem Types

  • CWE-190 Integer Overflow or Wraparound CWE