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 improper certificate validation.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.7",
  "pubDate": "2026-08-20T22:17:11.677Z",
  "pubdate": "2026-08-20T22:17:11.677Z",
  "executiveSummary": "This vulnerability involves an improper certificate validation flaw impacting IBM AIX and IBM PowerVM VIOS operating environments.\nSpecifically, the flaw affects IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1.\nAn unauthenticated remote attacker can exploit this weakness to bypass cryptographic trust verifications during network communications or authentication procedures.\nSuccessful exploitation of this vulnerability enables a remote threat actor to execute arbitrary code within the context of the vulnerable application or system component.\nThe primary impact includes complete compromise of confidentiality, integrity, and availability of the underlying operating system or virtualization instance.\nThe risk implication is severe, as remote code execution allows adversaries to install persistent backdoors, escalate privileges, and pivot within the enterprise network.\nExploitation requirements include network connectivity to the vulnerable service handling certificate processing, allowing remote attack vectors without requiring prior credentials or local access based on the provided vulnerability scope.",
  "technicalDetails": "The root cause of the vulnerability stems from improper certificate validation logic within the affected software components of IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1.\nDuring secure socket layer (SSL), transport layer security (TLS), or associated cryptographic handshake procedures, the application fails to properly validate the authenticity, expiration, revocation status, or cryptographic chain of trust of X.509 certificates presented by a remote endpoint.\nBecause the validation routines inadequately verify certificate signatures or issuer authorities, an attacker can supply a crafted, self-signed, or otherwise untrusted digital certificate during the communication channel establishment.\nThe attack flow begins when the remote attacker initiates a network connection to a vulnerable daemon, service, or management interface running on the target IBM AIX or IBM PowerVM VIOS system.\nDuring the cryptographic negotiation phase, the vulnerable component incorrectly accepts the attacker-controlled or spoofed certificate as a valid, trusted credential.\nThis failure in trust verification allows the attacker to successfully establish a privileged or trusted session, bypassing intended mutual authentication or secure channel enforcement mechanisms.\nLeveraging this improper validation state, the attacker can manipulate subsequent data exchanges, inject malicious payloads, or exploit memory corruption flaws exposed through the trusted communication channel.\nThe vulnerable component processes the incoming data streams without adequate sanitization, leading directly to arbitrary code execution.\nThe network exposure includes any listening network services on IBM AIX and IBM PowerVM VIOS that rely on the flawed certificate validation routines.\nAuthentication requirements are bypassed or circumvented due to the trust verification failure, permitting remote unauthenticated access to functionality that should be restricted.\nPrivilege requirements depend on the execution context of the vulnerable service, which frequently operates with elevated or root-equivalent privileges within IBM AIX and IBM PowerVM VIOS environments.\nPost-exploitation impact includes full system compromise, unauthorized data access, execution of administrative operating system commands, and potential disruption of virtualized workloads managed by IBM PowerVM VIOS."
}