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 improper privilege management.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.0",
  "pubDate": "2026-08-20T15:17:28.433Z",
  "pubdate": "2026-08-20T15:17:28.433Z",
  "executiveSummary": "A privilege management vulnerability exists in IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1 that could allow a local attacker to achieve unauthorized elevation of privilege.\nThe vulnerability is characterized by improper privilege management within the operating system and virtualization platform components, leading to a significant security risk for multi-tenant or shared environments.\nThe primary impact of successful exploitation is the unauthorized acquisition of elevated privileges, potentially granting the threat actor root or administrative control over the affected system.\nThe attack vector requires local access to the target host, implying that the adversary must first establish an authenticated local session on the vulnerable operating system or Virtual I/O Server (VIOS) instance.\nBecause the flaw stems from deficient privilege boundaries and access controls, a standard local user can leverage the misconfigured component to bypass intended security restrictions.\nRisk implications include full system compromise, data exfiltration, tampering with virtualized workloads, and potential lateral movement within the enterprise infrastructure.\nOrganizations operating the specified IBM AIX and PowerVM VIOS versions face heightened exposure on systems where untrusted users hold interactive or programmatic shell access.",
  "technicalDetails": "The root cause of this vulnerability lies in improper privilege management within IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1.\nSpecifically, the affected components fail to adequately enforce least privilege principles, allowing local users to interact with sensitive binaries, scripts, or system routines in an unintended manner.\nThe vulnerability requires local access and requires the attacker to possess prior authentication to the underlying operating system or VIOS environment.\nNetwork exposure is not a direct prerequisite for initial exploitation, as the attack vector is strictly local, although remote access methods such as SSH could be utilized to establish the initial local context.\nExploitation typically occurs through the manipulation of improperly secured system processes, SUID/SGID binaries, or management utilities that execute with higher privileges than the invoking user.\nStep-by-step attack flow generally proceeds as follows: First, the low-privileged local attacker authenticates to the IBM AIX or PowerVM VIOS host. Second, the adversary identifies and targets the vulnerable component exhibiting improper privilege management. Third, the attacker interacts with the vulnerable interface, passing maliciously crafted inputs, environment variables, or arguments designed to subvert the intended execution flow. Fourth, the system executes the routine under an elevated security context without proper validation of the caller's authorization level. Finally, the attacker successfully spawns a root shell or modifies system-level configurations to ensure persistent, elevated administrative access.\nPost-exploitation impact includes complete administrative control over the AIX logical partition (LPAR) or the VIOS management partition, allowing the adversary to intercept virtual storage traffic, manipulate virtual Ethernet settings, compromise guest operating systems, and bypass hypervisor-level isolation boundaries."
}