IBM AIX 7.2/7.3 PowerVM VIOS 4.1: Local Code Exec via Pointer Validation
CVE-2026-18840 Published on August 20, 2026

Vulnerabilities in IBM AIX and PowerVM VIOS
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to execute arbitrary code due to improper validation of an attacker-controlled pointer.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-18840 is exploitable with local system access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
HIGH
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

Untrusted Pointer Dereference

The program obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.


Products Associated with CVE-2026-18840

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IBM Aix
 
IBM Powervm Vios
 

Affected Versions

IBM AIX: IBM PowerVM VIOS: