CVE-2026-18870
Received Received - Intake

IBM PowerVM Hypervisor Out-of-Bounds Read Vulnerability

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: IBM Corporation

Description
IBM PowerVM Hypervisor FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81, and FW950.00 through FW950.H3 could allow a remote attacker to obtain sensitive information due to an out-of-bounds read.

CVSS Scores

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-18870
EUVD
EUVD-2026-86006

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
ibm powervm_hypervisor From FW1120.00 (inc) to FW1120.01 (inc)
ibm powervm_hypervisor From FW1110.00 (inc) to FW1110.31 (inc)
ibm powervm_hypervisor From FW1060.00 (inc) to FW1060.81 (inc)
ibm powervm_hypervisor From FW950.00 (inc) to FW950.H3 (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

CVE-2026-18870 is a vulnerability in IBM PowerVM Hypervisor versions FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81, and FW950.00 through FW950.H3. It allows a remote attacker to obtain sensitive information due to an out-of-bounds read issue.

Detection Guidance

Detecting this vulnerability requires checking the firmware version of the IBM PowerVM Hypervisor. Compare installed versions against affected ranges: FW1120.00-FW1120.01, FW1110.00-FW1110.31, FW1060.00-FW1060.81, FW950.00-FW950.H3. Use IBM's firmware management tools or commands like 'lsmcode -r' on AIX systems to list current firmware versions.

Impact Analysis

This vulnerability could allow an attacker to access sensitive data on systems running affected PowerVM Hypervisor versions. The impact includes potential exposure of confidential information, though the CVSS score of 4.3 suggests a medium severity level.

Mitigation Strategies

Install the appropriate firmware updates provided by IBM for your Power System model. Check IBM Support page for specific update instructions. No workarounds exist, so applying official patches is critical to remediate the out-of-bounds read vulnerability.

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