CVE-2026-16840: CWE-787 Out-of-bounds Write in IBM AIX
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.
AI Analysis
Technical Summary
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.
CVE-2026-16840: CWE-787 Out-of-bounds Write in IBM 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
Affected software
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:*:*:*:*:*:*:*Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
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.
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
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.