CVE-2026-18842: CWE-787 Out-of-bounds Write in IBM AIX
CVE-2026-18842 is a high-severity vulnerability in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1 involving an out-of-bounds write that could allow a local attacker to gain elevated privileges.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-18842) affects IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. It is caused by an out-of-bounds write condition (CWE-787) that could be exploited by a local attacker to escalate privileges on the affected systems. The CVSS v3.1 base score is 8.4, indicating high severity with impacts on confidentiality, integrity, and availability. No official remediation or patch information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation of this vulnerability could allow a local attacker to gain elevated privileges, potentially leading to full system compromise including unauthorized access to sensitive data, modification of system files, and disruption of system availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict local access to trusted users only and monitor for suspicious local activity.
CVE-2026-18842: CWE-787 Out-of-bounds Write in IBM AIX
Description
CVE-2026-18842 is a high-severity vulnerability in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1 involving an out-of-bounds write that could allow a local attacker to gain elevated privileges.
CVSS v3.1
Score 8.4high
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:*:*:*:*:*:*:*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 (CVE-2026-18842) affects IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. It is caused by an out-of-bounds write condition (CWE-787) that could be exploited by a local attacker to escalate privileges on the affected systems. The CVSS v3.1 base score is 8.4, indicating high severity with impacts on confidentiality, integrity, and availability. No official remediation or patch information is currently available, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation of this vulnerability could allow a local attacker to gain elevated privileges, potentially leading to full system compromise including unauthorized access to sensitive data, modification of system files, and disruption of system availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict local access to trusted users only and monitor for suspicious local activity.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-08-04T14:46:50.774Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a877e39acd9273b493410a2
Added to database: 08/20/2026, 22:22:49 UTC
Last enriched: 08/20/2026, 22:37:43 UTC
Last updated: 08/21/2026, 01:01:56 UTC
Views: 3
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