CVE-2026-16707
Received Received - Intake

IBM PowerVM Hypervisor Memory Access Vulnerability

Publication date: 2026-08-19

Last updated on: 2026-08-19

Assigner: IBM Corporation

Description
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 send a specially crafted mailbox message to read or modify arbitrary regions of Hostboot memory, compromising the host firmware boot stack and the hypervisor subsequently loaded by it. Successful exploitation results in a confidentiality, integrity, and availability impact to the managed system.

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Meta Information

Published
2026-08-19
Last Modified
2026-08-19
Generated
2026-08-20
AI Q&A
2026-08-19
EPSS Evaluated
N/A
NVD
CVE-2026-16707
EUVD
EUVD-2026-62840

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
ibm powervm_hypervisor From FW1110.00 (inc) to FW950.H2 (inc)
ibm powervm_hypervisor fw1120.00
ibm powervm_hypervisor to fw1110.30 (inc)
ibm powervm_hypervisor to fw1060.80 (inc)
ibm powervm_hypervisor to fw950.h2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This vulnerability affects IBM PowerVM Hypervisor firmware versions FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2. An attacker with authenticated service-level access to the Flexible Service Processor (FSP) can send a specially crafted mailbox message to read or modify arbitrary regions of Hostboot memory. This compromises the host firmware boot stack and the hypervisor loaded afterward.

The vulnerability is classified under CWE-125 (Out-of-bounds Read) with a CVSS base score of 8.2, indicating high severity.

Detection Guidance

Detection requires checking the firmware version of IBM Power Systems. Use the FSP command line interface to run 'version' or check the system firmware via IBM Hardware Management Console (HMC). Compare versions against affected ranges: FW1120.00, FW1110.00-FW1110.30, FW1060.00-FW1060.80, FW950.00-FW950.H2.

Impact Analysis

Successful exploitation results in a confidentiality, integrity, and availability impact to the managed system. Attackers can read or modify critical firmware memory regions, potentially leading to system compromise, data breaches, or service disruption.

Mitigation Strategies

Install the latest firmware updates provided by IBM: FW1110.31, FW1120.01, FW1060.81, or FW950.H3. Access updates via IBM Fix Central and apply them through the HMC or FSP. No workarounds exist; updating firmware is the only mitigation.

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