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 an out-of-bounds write.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-19T20:17:10.523Z",
  "pubdate": "2026-08-19T20:17:10.523Z",
  "executiveSummary": "This vulnerability involves an out-of-bounds write weakness affecting IBM AIX and IBM PowerVM VIOS. The flaw enables a remote attacker to execute arbitrary code on targeted systems, introducing severe risk implications regarding system integrity, confidentiality, and availability.\nSpecifically, the affected products include IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1. Successful exploitation permits unauthorized actors to leverage memory corruption mechanics to compromise the underlying operating system or virtualization platform.\nThe attack capabilities include arbitrary code execution, which can lead to complete system takeover, privilege escalation, or unauthorized access to sensitive data processed within the logical partitions or the Virtual I/O Server environment.\nExploitation requirements center on network accessibility to vulnerable services running on the targeted operating system or hypervisor layer. Mitigation demands the application of official vendor patches or interim fixes provided by IBM to resolve the underlying memory management defect.",
  "technicalDetails": "The vulnerability is rooted in an out-of-bounds write defect within memory management or input processing routines inherent to IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1. An out-of-bounds write occurs when software writes data past the end, or before the beginning, of the intended buffer, corrupting adjacent memory regions.\nThe affected components process incoming data or control messages without performing adequate bounds checking or length validation. When a remote attacker supplies a maliciously crafted payload containing manipulated size parameters or excessively large data structures, the target component miscalculates memory offsets during write operations.\nThe step-by-step attack flow begins with network exposure where the attacker establishes communication with a vulnerable service or daemon running on the IBM AIX or IBM PowerVM VIOS instance. The attacker transmits the meticulously engineered payload designed to trigger the out-of-bounds condition.\nUpon reception, the vulnerable routine processes the input and executes a memory write operation that overflows the allocated buffer. This overwrites critical adjacent data structures, control flow pointers, or execution context within the process memory space.\nBy systematically overwriting return addresses or function pointers, the attacker redirects execution flow to malicious shellcode or arbitrary binary instructions contained within the payload. Because the affected processes may execute with elevated privileges, successful exploitation yields immediate execution of arbitrary code with the privilege level of the compromised process or kernel context.\nPost-exploitation impact includes persistent unauthorized access, lateral movement across connected logical partitions in a PowerVM architecture, data exfiltration, and disruption of critical virtualization and operating system services."
}