Description

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 heap-based buffer overflow.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-20T22:17:16.263Z",
  "pubdate": "2026-08-20T22:17:16.263Z",
  "executiveSummary": "A heap-based buffer overflow vulnerability has been identified in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. This critical security flaw allows a remote attacker to execute arbitrary code within the context of the vulnerable application or operating system component. The vulnerability arises from improper bounds checking during the processing of input data within the affected memory structures on the heap.\nSuccessful exploitation of this flaw can lead to severe consequences, including full remote code execution, system compromise, confidentiality breaches, and integrity degradation. The risk implications are high due to the potential for unauthenticated remote attackers to compromise core infrastructure components hosting the affected operating systems and virtualization management environments.\nThe attack capabilities include memory corruption and arbitrary code execution without requiring specialized user interaction, assuming network reachability to the vulnerable service. Remediation requires applying the official vendor-supplied patches or fixes provided by IBM for the respective AIX and PowerVM VIOS versions.",
  "technicalDetails": "The vulnerability is classified as a heap-based buffer overflow affecting memory management routines within IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. The root cause stems from the application or system daemon failing to adequately validate the size and length of incoming data before copying it into a dynamically allocated heap buffer. When an attacker sends a specially crafted payload exceeding the allocated memory bounds, a heap overflow occurs, overwriting adjacent heap metadata or critical program variables.\nThe attack flow begins with a remote attacker establishing network connectivity to a vulnerable service running on the target system. The attacker transmits a malicious network request or input stream containing an oversized payload engineered to target the vulnerable heap allocation. As the application processes the input, the unchecked data overflows the boundary of the target heap buffer.\nThrough precise heap manipulation and payload construction, the attacker can overwrite adjacent heap chunks, function pointers, or critical control data structures. When the application subsequently attempts to execute an overwritten function pointer or process corrupted control flow data, execution is redirected to attacker-supplied shellcode or native instructions contained within the payload.\nDepending on the specific vulnerable component, exploitation may occur over network protocols utilized by the underlying services. The privilege and authentication requirements depend on the exposure of the vulnerable network daemon, potentially allowing unauthenticated remote execution if the service is exposed externally or accessible within an internal network segment. The post-exploitation impact includes complete system compromise, enabling the adversary to execute arbitrary commands, escalate privileges if running in a restricted context, deploy persistent backdoors, and pivot to other systems within the enterprise environment."
}