CVE-2026-18670

Received Received - Intake

Integer Underflow in IBM AIX and PowerVM VIOS

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: IBM Corporation

Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to cause a denial of service and potentially disclose sensitive information due to an integer underflow.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-20

Last Modified

2026-08-20

Generated

2026-08-21

AI Q&A

2026-08-21

EPSS Evaluated

N/A

NVD

CVE-2026-18670

EUVD

EUVD-2026-63738

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	aix	7.2
ibm	aix	7.3
ibm	powervm_vios	4.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer underflow issue in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It allows a remote attacker to cause a denial of service and potentially disclose sensitive information by exploiting the flaw.

Detection Guidance

Detection of this vulnerability requires checking for IBM AIX 7.2, 7.3, or IBM PowerVM VIOS 4.1 systems and verifying if they are exposed to network traffic that could trigger the integer underflow issue. No specific commands are provided in the CVE details. General steps include inspecting system versions, monitoring network traffic for unusual patterns, and applying IBM's security advisories for patches.

Impact Analysis

The impact includes system crashes due to denial of service and possible exposure of sensitive data. Attackers could exploit this to disrupt services or access confidential information.

Compliance Impact

This vulnerability could lead to unauthorized data disclosure, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Apply IBM AIX and PowerVM VIOS security patches or updates as soon as they become available to address the integer underflow issue.

Hi! I’m here to help you understand CVE-2026-18670. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70