Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to compromise the confidentiality and integrity of the system due to an out-of-bounds write.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.7",
  "pubDate": "2026-08-20T22:17:10.983Z",
  "pubdate": "2026-08-20T22:17:10.983Z",
  "executiveSummary": "An out-of-bounds write vulnerability has been identified in IBM AIX 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. This vulnerability arises from improper handling of memory boundaries within the affected operating systems and virtualization components. A remote attacker can leverage this security flaw to compromise the confidentiality and integrity of the underlying system.\nThe primary risk implication is the potential for unauthorized memory modification and data exposure, which can lead to system compromise or unauthorized access to sensitive information. Successful exploitation allows a remote threat actor to execute arbitrary operations within the memory space of the affected component, depending on the specific attack vector.\nThe vulnerability affects specific releases of core enterprise infrastructure products, making timely remediation critical for maintaining system integrity in virtualized and bare-metal Power Systems environments. While specific authentication and complexity requirements are inherent to the remote attack surface, the potential impact on confidentiality and integrity necessitates rigorous administrative oversight and implementation of official vendor patches.",
  "technicalDetails": "The vulnerability is characterized as an out-of-bounds write, a memory safety defect occurring when software performs a write operation past the allocated buffer boundary of a memory region. In the context of IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1, this flaw typically stems from insufficient bounds checking or integer arithmetic errors during the processing of incoming data structures or network protocols handled by vulnerable system daemons or kernel subsystems.\nFrom an exploitation perspective, a remote attacker can interact with vulnerable network services or interfaces exposed by the affected operating system or hypervisor component. By crafting and transmitting a maliciously structured payload, the attacker forces the target system to execute a write operation outside the intended buffer boundaries. This manipulation can overwrite adjacent memory variables, control structures, or function pointers depending on the memory layout.\nThe attack flow begins with network reconnaissance to identify exposed services running on IBM AIX or IBM PowerVM VIOS 4.1. The attacker then transmits the specially crafted input over the network interface. Upon ingestion, the vulnerable component fails to properly validate the size or offset of the incoming data, resulting in the out-of-bounds memory write. The post-exploitation impact includes the corruption of critical system data structures, leading to a direct breach of system confidentiality and integrity.\nThe vulnerable components reside within the core networking or processing stacks of IBM AIX versions 7.2 and 7.3, alongside IBM PowerVM VIOS version 4.1. Network exposure is a prerequisite for remote exploitation, requiring connectivity to vulnerable daemons or interfaces. Privilege and authentication requirements depend on the specific attack surface entry point, though the flaw fundamentally enables unauthorized state modification through memory corruption."
}