CVE-2026-17425 in AIX
Summary
by MITRE • 08/21/2026
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to cause a denial of service due to a stack buffer overflow.
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Analysis
by VulDB Data Team • 08/21/2026
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 as a stack buffer overflow, which occurs when a program writes more data to a fixed-length block of memory on the call stack than it can hold. In the context of these IBM systems, this defect allows an unauthenticated remote attacker who has network access to exploit the flaw by sending specially crafted requests or packets that exceed the allocated buffer size. The technical mechanism involves the application failing to perform adequate bounds checking before copying input data into a statically allocated memory region on the stack, leading to adjacent memory being overwritten with malicious content.
From an operational perspective, the primary impact of this vulnerability is a denial of service condition. When the overflow occurs, it corrupts critical control data such as return addresses or function pointers stored on the stack. This corruption typically causes the affected application or system component to crash immediately upon processing the malformed input. For IBM AIX and PowerVM VIOS environments, which often serve as foundational infrastructure for enterprise computing and virtualization workloads, a denial of service can result in significant downtime, disruption of critical business operations, and potential loss of availability for connected systems that rely on these services. While stack buffer overflows are historically associated with arbitrary code execution, the specific manifestation described here emphasizes system instability and unavailability rather than direct remote code execution, although the underlying memory corruption could theoretically be leveraged further if other conditions align.
This vulnerability maps directly to Common Weakness Enumeration (CWE) identifier CWE-121, which describes a stack-based buffer overflow. The exploitation technique falls under MITRE ATT&CK tactic Tactic TA0004: Privilege Escalation or Impact category TA0040: Impact, specifically aligning with techniques that cause service disruption such as resource exhaustion or system crash. Security professionals should note that while the immediate effect is a denial of service, stack-based overflows are often precursors to more severe compromises if the attacker can control the overwritten data to redirect execution flow. Therefore, treating this issue solely as an availability risk may underestimate its potential severity in complex attack chains where additional vulnerabilities or misconfigurations exist within the same environment.
To mitigate this vulnerability, organizations running IBM AIX 7.2 and 7.3 or PowerVM VIOS 4.1 must apply the latest security patches provided by IBM. These updates typically include code changes that enforce strict input validation and buffer size verification before data processing occurs. Administrators should verify their current software versions against IBM's official advisory documentation to determine applicability. In addition to patching, implementing network-level controls such as intrusion prevention systems can help detect and block malformed packets attempting to exploit this flaw before they reach the vulnerable service. Regular vulnerability scanning and configuration management practices are also recommended to ensure that all components within the AIX and PowerVM ecosystem remain up-to-date with security fixes, thereby reducing the attack surface available to potential remote adversaries seeking to disrupt system availability or escalate privileges through memory corruption techniques.