Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to gain elevated privileges due to a heap buffer overflow.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-20T22:17:08.810Z",
  "pubdate": "2026-08-20T22:17:08.810Z",
  "executiveSummary": "A heap buffer overflow vulnerability exists within IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. This security flaw enables a local attacker to execute arbitrary code and achieve elevated privileges on the target system.\nThe vulnerability represents a significant risk to host integrity and confidentiality. Because it allows privilege escalation from a standard user context, successful exploitation compromises the foundational security boundary of the affected operating system instances.\nThe attack vector requires local access to the system. While specific remote networking capabilities are not mentioned as direct vectors, local interactive or programmatic access is necessary for an attacker to supply the malicious input that triggers the heap corruption.\nThe root cause stems from improper bounds checking or memory management within the affected component when processing specific local inputs. When exploited, the heap buffer overflow leads to memory corruption, potentially allowing the redirection of execution flow.\nOrganizations utilizing the specified versions of IBM AIX and IBM PowerVM VIOS must prioritize remediation to prevent unauthorized privilege escalation and maintain enterprise security posture.",
  "technicalDetails": "The vulnerability is classified as a heap buffer overflow affecting IBM AIX versions 7.2 and 7.3, alongside IBM PowerVM VIOS version 4.1.\nThe root cause of the vulnerability lies in unsafe memory handling operations within the affected component, where input data exceeding the allocated buffer size is written to a dynamically allocated heap region without adequate length validation.\nExploitation of this vulnerability requires local access to the host system. The attacker must possess sufficient local execution capabilities to interact with the vulnerable component, supply crafted input, and trigger the heap overflow condition.\nThe step-by-step attack flow involves an authenticated local user supplying oversized or specially malformed data to the vulnerable application, system utility, or kernel interface. As the input is processed, it overflows the boundaries of the target heap buffer, overwriting adjacent heap metadata or critical data structures in memory.\nBy meticulously engineering the payload injected into the heap, an advanced attacker can manipulate adjacent memory contents. This memory corruption can be leveraged to hijack the control flow of the executing process or kernel routine.\nUpon successful control flow hijacking, the payload executes with the elevated privileges associated with the vulnerable process or context, frequently resulting in root or superuser privilege escalation.\nPost-exploitation impact includes complete system compromise, unauthorized access to sensitive data, modification of system configurations, and potential persistence mechanisms established by the threat actor."
}