CVE-2026-16903: CWE-787 Out-of-bounds Write in IBM AIX
Description
CVE-2026-16903 is a critical vulnerability in IBM AIX versions 7.2 and 7.3, and IBM PowerVM VIOS 4.1. It involves an out-of-bounds write (CWE-787) that could allow a remote attacker to execute arbitrary code or cause a denial of service. The vulnerability has a high CVSS score of 9.6, indicating severe impact on confidentiality, integrity, and availability. No information about available patches or vendor advisories is provided.
CVSS v3.1
Score 9.6critical
Affected software
IBM
AIX
IBM
PowerVM VIOS
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:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is an out-of-bounds write flaw in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. It could be exploited remotely without privileges or user interaction to execute arbitrary code or cause denial of service. The CVSS 3.1 vector indicates attack complexity is low, no privileges required, no user interaction, and scope is changed, with high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation could lead to remote code execution or denial of service, severely compromising system confidentiality, integrity, and availability on affected IBM AIX and PowerVM VIOS versions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No patch or official fix information is provided in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-07-24T05:59:44.077Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a860d18acd9273b498f9c2e
Added to database: 08/19/2026, 20:07:52 UTC
Last enriched: 09/11/2026, 05:31:58 UTC
Last updated: 10/04/2026, 10:02:25 UTC
Views: 43
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