CVE-2026-16840

Received Received - Intake

Out-of-Bounds Write in IBM AIX and PowerVM VIOS

Publication date: 2026-08-19

Last updated on: 2026-08-19

Assigner: IBM Corporation

Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to an out-of-bounds write.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-19

Last Modified

2026-08-19

Generated

2026-08-20

AI Q&A

2026-08-20

EPSS Evaluated

N/A

NVD

CVE-2026-16840

EUVD

EUVD-2026-62729

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-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds write issue in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It allows a remote attacker to execute arbitrary code by exploiting memory corruption due to improper bounds checking.

Impact Analysis

If exploited, this vulnerability could let attackers run malicious code on affected systems, potentially leading to unauthorized access, data theft, or system compromise. It poses a high risk due to its remote execution capability without authentication.

Compliance Impact

This vulnerability allows remote attackers to execute arbitrary code, which could lead to unauthorized access, data breaches, or data manipulation. Such risks may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data security) by exposing sensitive information or failing to ensure confidentiality and integrity of data.

Mitigation Strategies

Apply IBM-provided patches or updates for AIX 7.2, 7.3, and PowerVM VIOS 4.1 to address the out-of-bounds write vulnerability.

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