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CVE-2026-16840: CWE-787 Out-of-bounds Write in IBM AIX

0
Critical
VulnerabilityCVE-2026-16840cvecve-2026-16840cwe-787
Published: 08/19/2026 (08/19/2026, 19:31:14 UTC)
Source: CVE Database V5
Vendor/Project: IBM
Product: AIX

Description

CVE-2026-16840 is a critical vulnerability in IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1, involving an out-of-bounds write that could allow a remote attacker to execute arbitrary code without authentication or user interaction.

CVSS v3.1

Score 9.8critical

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected software

Affected versions
=7.2=7.3
CPE configurations (6)
cpe:2.3:a:ibm:aix:7.2:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.2.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:aix:7.3.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:powervm_vios:4.1:*:*:*:*:*:*:*
cpe:2.3:a:ibm:powervm_vios:4.1.0:*:*:*:*:*:*:*

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/19/2026, 20:23:27 UTC

Technical Analysis

This vulnerability (CWE-787) affects IBM AIX 7.2 and 7.3 and IBM PowerVM VIOS 4.1. It is caused by an out-of-bounds write condition that could be exploited remotely to execute arbitrary code. The CVSS 3.1 base score is 9.8, indicating a critical severity with network attack vector, low attack complexity, no privileges required, no user interaction, and impacts to confidentiality, integrity, and availability. No official remediation or patch information is currently provided in the vendor advisory or CVE data.

Potential Impact

Successful exploitation could allow a remote attacker to execute arbitrary code on affected systems, leading to full compromise including confidentiality, integrity, and availability impacts. This could result in unauthorized control over the system and disruption of services.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict network access to affected systems and monitor for unusual activity related to IBM AIX 7.2 and 7.3 or PowerVM VIOS 4.1 environments.

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Technical Details

Data Version
5.2
Assigner Short Name
ibm
Date Reserved
2026-07-24T03:01:10.819Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a86098facd9273b498b4bf9

Added to database: 08/19/2026, 19:52:47 UTC

Last enriched: 08/19/2026, 20:23:27 UTC

Last updated: 08/19/2026, 20:23:27 UTC

Views: 2

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