Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to execute arbitrary code due to a buffer overflow.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.3",
  "pubDate": "2026-08-20T22:17:15.593Z",
  "pubdate": "2026-08-20T22:17:15.593Z",
  "executiveSummary": "A buffer overflow vulnerability has been identified in IBM AIX and IBM PowerVM VIOS, specifically impacting IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1. This vulnerability arises from improper boundary checks within the affected software components, allowing a local attacker to corrupt memory structures during execution. The primary security impact of this flaw is the potential execution of arbitrary code with the privileges of the vulnerable process or application context. Successful exploitation poses severe risk implications to the confidentiality, integrity, and availability of the underlying operating system and virtualized environments. The attacker capabilities are constrained by the requirement for local access to the target host to deliver and execute the exploit payload. While network exposure is not a direct prerequisite for this vector, local authenticated users or processes capable of interacting with the vulnerable subsystem can leverage the flaw. Remediation relies on applying vendor-supplied updates or patches corresponding to the affected versions of IBM AIX and IBM PowerVM VIOS as outlined in official security advisories.",
  "technicalDetails": "The vulnerability is fundamentally rooted in a classic buffer overflow condition, where the affected software component fails to perform adequate bounds checking on input data copied into a statically or dynamically allocated memory buffer. When an unvalidated input exceeds the allocated capacity of the target buffer, adjacent memory regions—including stack frames, control data, or function pointers—are overwritten. In the context of IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1, this memory corruption flaw can be triggered locally through interactions with vulnerable system binaries, APIs, or internal messaging handlers that process untrusted data without proper sanitization. Exploitation of this vulnerability requires local access to the system, where an authenticated attacker or a malicious local process can supply a maliciously crafted input vector designed to overflow the target buffer. The attack flow begins when the vulnerable function receives the oversized input, causing data to spill past the boundary of the buffer. By carefully structuring the payload, the attacker can overwrite critical execution control data, such as saved frame pointers and return addresses on the stack, or function pointers within the heap or data segments. When the execution flow reaches the corrupted pointer or returns from the vulnerable function, the instruction pointer is redirected to attacker-controlled shellcode or a targeted return-oriented programming (ROP) gadget chain. Depending on the execution context of the vulnerable component, the payload executes with elevated privileges, potentially granting the attacker unauthorized control over system resources, administrative capabilities, or the ability to compromise the hypervisor management layer in PowerVM VIOS environments. Post-exploitation impact includes full system compromise, escalation of privileges, data exfiltration, and persistence mechanisms within the affected IBM AIX or VIOS instance."
}