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 a buffer overflow.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.1",
  "pubDate": "2026-08-20T22:17:17.940Z",
  "pubdate": "2026-08-20T22:17:17.940Z",
  "executiveSummary": "A buffer overflow vulnerability has been identified in IBM AIX and IBM PowerVM VIOS, which could potentially allow a remote attacker to execute arbitrary code on vulnerable systems. The flaw resides in the handling of memory buffers within the affected operating system components. Successful exploitation of this vulnerability can lead to remote code execution, compromising the confidentiality, integrity, and availability of the underlying host. The affected products include IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1. The risk implications are severe, as unauthorized attackers could leverage this flaw to gain unauthorized access, execute malicious payloads, and potentially pivot deeper into enterprise network environments. The attacker capabilities involve remote exploitation vectors without requiring complex preconditions, assuming network reachability to the vulnerable service or component. Remediation relies strictly on applying official vendor-supplied patches and adhering to foundational hardening standards for enterprise UNIX environments.",
  "technicalDetails": "The vulnerability is fundamentally a buffer overflow flaw impacting IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1. The root cause stems from improper bounds checking during the processing of input data within vulnerable binaries or kernel subsystems, where data exceeding the allocated memory buffer size is allowed to overwrite adjacent stack or heap memory regions. When an unauthenticated remote attacker transmits a specially crafted sequence of bytes to the target system, the vulnerable component fails to properly validate the length of the input before copying it into memory.\nThe attack flow begins with network exposure, where the vulnerable service listens for incoming connection requests or protocol interactions. The attacker delivers a crafted payload designed to overflow the target buffer. As the input exceeds the fixed-length buffer, critical control data—such as saved frame pointers and return addresses on the stack—is overwritten with attacker-controlled values. When the execution flow attempts to return from the vulnerable function, the instruction pointer is redirected to the attacker's supplied shellcode or a targeted return-oriented programming (ROP) gadget chain.\nDepending on the execution context of the vulnerable component, the resulting payload behavior can execute arbitrary instructions with elevated privileges, potentially leading to a complete system compromise. The exploitation requires network access to the affected service, but typically does not require prior authentication or specialized user privileges. Post-exploitation impact includes arbitrary command execution, unauthorized data exfiltration, installation of persistent backdoors, and lateral movement across interconnected logical partitions (LPARs) managed by the compromised PowerVM VIOS or AIX environment."
}