CVE-2026-16841

Analyzed Analyzed - Analysis Complete

Stack Buffer Overflow in IBM AIX and PowerVM VIOS

Publication date: 2026-08-19

Last updated on: 2026-08-24

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 a stack buffer overflow.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-19

Last Modified

2026-08-24

Generated

2026-09-09

AI Q&A

2026-08-19

EPSS Evaluated

2026-09-07

NVD

CVE-2026-16841

EUVD

EUVD-2026-62731

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	aix	From 7.2.5 (inc) to 7.2.5.212 (inc)
ibm	aix	From 7.3.2 (inc) to 7.3.2.5 (inc)
ibm	aix	From 7.3.3 (inc) to 7.3.3.2 (inc)
ibm	aix	From 7.3.4 (inc) to 7.3.4.1 (inc)
ibm	vios	From 4.1.0 (inc) to 4.1.0.50 (exc)
ibm	vios	From 4.1.1.0 (inc) to 4.1.1.30 (exc)
ibm	vios	From 4.1.2.0 (inc) to 4.1.2.20 (exc)

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 a stack buffer overflow in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It allows a remote attacker to execute arbitrary code by sending specially crafted input that overflows a buffer on the stack.

Detection Guidance

Detection requires checking for IBM AIX 7.2, 7.3, or PowerVM VIOS 4.1 versions. Use system commands like oslevel -s for AIX or ioslevel for VIOS to verify versions. Monitor for unusual network traffic or crashes that may indicate exploitation.

Impact Analysis

An attacker could exploit this to run malicious code on affected systems, potentially leading to unauthorized access, data theft, or system compromise. This could disrupt operations or allow further attacks within the network.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations may face penalties or compliance failures if systems are not patched.

Mitigation Strategies

Apply IBM-provided patches or updates for AIX 7.2, 7.3, and PowerVM VIOS 4.1 to address the stack buffer overflow issue. Monitor IBM security advisories for fixes and restrict remote access to affected systems until patched.

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