---
id: CVE-2026-16661
title: >-
  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
summary: >-
  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-l…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-190
published: '2026-08-19'
updated: '2026-08-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16661'
references:
  - url: 'https://www.ibm.com/support/pages/node/7283237'
    label: psirt@us.ibm.com
tags:
  - nvd
epss: 0.00169
epssPercentile: 0.05482
ingestedAt: '2026-08-22T22:38:27.433Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.