CVE-2026-16913 in AIX
Summary
by MITRE • 08/19/2026
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code due to a stack buffer overflow.
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Analysis
by VulDB Data Team • 08/19/2026
The vulnerability identified in IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM Virtual I/O Server (VIOS) version 4.1, represents a critical security flaw rooted in improper memory management within the affected software components. This specific issue is classified technically as a stack-based buffer overflow, which occurs when a program writes more data to a fixed-length block of memory on the call stack than it was allocated to hold. In this context, the vulnerability allows an unauthenticated remote attacker to exploit this flaw by sending specially crafted network requests or packets that exceed the expected input limits of the vulnerable service. The lack of adequate bounds checking during the processing of these inputs leads to data overwriting adjacent memory locations on the stack, which can corrupt critical control structures such as return addresses and saved frame pointers.
From a technical perspective, this flaw aligns with Common Weakness Enumeration (CWE) identifier CWE-121, specifically describing a stack-based buffer overflow where user-controlled input is not properly validated before being copied into a fixed-size buffer on the stack. The operational impact of such a vulnerability is severe because it can lead to arbitrary code execution under the context of the affected application or service. If an attacker successfully exploits this condition, they may gain full control over the underlying operating system, allowing them to install malware, steal sensitive data, modify configurations, or use the compromised system as a pivot point for further attacks within the network infrastructure. Given that IBM AIX and PowerVM VIOS are often deployed in enterprise environments handling critical business processes, the compromise of these systems can result in significant operational downtime and data integrity issues.
The attack vector associated with this vulnerability is classified under MITRE ATT&CK technique T1190, which covers Exploit Public-Facing Applications. This indicates that the flaw resides in a component accessible from external networks or untrusted zones, making it particularly dangerous as it does not require prior authentication on the target system. The exploitation typically involves crafting malicious payloads designed to overwrite the instruction pointer with shellcode or return-oriented programming (ROP) gadgets, thereby hijacking the execution flow of the vulnerable process. This type of remote code execution vulnerability is historically one of the most prevalent and impactful classes of security flaws in network services, underscoring the urgency for immediate remediation.
To mitigate this risk, organizations running IBM AIX 7.2 or 7.3, as well as PowerVM VIOS 4.1, must apply the latest available service packs and patches provided by IBM that address this specific buffer overflow condition. It is imperative to verify that all systems are updated to versions where the input validation mechanisms have been strengthened to prevent stack overflows. Additionally, implementing network-level security controls such as intrusion detection or prevention systems can help identify and block exploit attempts before they reach the vulnerable application layer. Regular vulnerability scanning and penetration testing should be conducted to ensure no other similar weaknesses exist in related services, maintaining a robust defense-in-depth posture against remote exploitation attempts.