Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to gain root privileges due to improper authentication.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-19T15:16:56.563Z",
  "pubdate": "2026-08-19T15:16:56.563Z",
  "executiveSummary": "A vulnerability exists in IBM AIX 7.2 and 7.3, alongside IBM PowerVM VIOS 4.1, which could allow a remote attacker to gain root privileges due to improper authentication.\nThis improper authentication flaw poses a severe risk to organizational security, as successful exploitation results in complete system compromise and arbitrary command execution with the highest level of privileges.\nThe affected products include IBM AIX versions 7.2 and 7.3, and IBM PowerVM VIOS version 4.1.\nAn unauthenticated remote attacker with network access to the vulnerable service can leverage this weakness to bypass authentication controls entirely.\nThe primary risk implication is a total loss of confidentiality, integrity, and availability of the underlying operating system and virtualized workloads managed by the affected hypervisor or UNIX environment.\nExploitation requires network connectivity to vulnerable endpoints and targets flaws in how identity verification or credential validation is handled by the authentication subsystem.\nOrganizations running the specified versions must prioritize remediation to prevent unauthorized privilege escalation and system takeover.",
  "technicalDetails": "The root cause of this security defect stems from improper implementation of authentication checks within IBM AIX 7.2, AIX 7.3, and IBM PowerVM VIOS 4.1.\nThe vulnerability resides within the authentication subsystem responsible for validating user sessions or remote service connections.\nDue to insufficient validation of credentials or logic flaws in the authentication state machine, an adversary can bypass security boundaries without providing valid authentication tokens or cryptographic proofs.\nThe attack flow begins with network reconnaissance to identify exposed services running on the targeted IBM AIX or PowerVM VIOS instances.\nThe remote attacker transmits specially crafted network requests designed to exploit the authentication bypass mechanism.\nBecause the vulnerable component incorrectly verifies the identity of the incoming connection or request, it grants unauthorized access to the session handler.\nFollowing the successful bypass of authentication controls, the attacker interacts with privileged system interfaces or administrative daemons.\nThrough these interfaces, the attacker executes arbitrary commands or leverages underlying system utilities to elevate privileges from an unauthenticated context to the root security context.\nThe post-exploitation impact includes unrestricted administrative control over the operating system or Virtual I/O Server, enabling the adversary to deploy persistence mechanisms, modify system configurations, access sensitive data, or pivot to other systems within the internal network infrastructure.\nNetwork exposure is required, as the flaw allows remote exploitation, and the affected versions lack robust internal checks to restrict the origin of the malicious request."
}