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": "9.8",
  "pubDate": "2026-08-20T22:17:13.350Z",
  "pubdate": "2026-08-20T22:17:13.350Z",
  "executiveSummary": "A buffer overflow vulnerability has been identified in IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1. This security flaw enables a remote attacker to execute arbitrary code within the context of the vulnerable application or operating system component.\nThe vulnerability arises from improper bounds checking during the processing of input data, allowing malicious payloads to overwrite adjacent memory regions, including stack or heap structures.\nSuccessful exploitation of this flaw can lead to complete system compromise, unauthorized execution of privileged instructions, denial of service, and potential lateral movement within the affected network infrastructure.\nThe risk implications are critical due to the potential for remote code execution without requiring prior authentication, depending on the network exposure of the affected service.\nAttacker capabilities include injecting and executing arbitrary machine code or system commands, potentially yielding administrative control over the targeted IBM AIX or IBM PowerVM VIOS instance.\nMitigation requires applying official vendor patches and implementing defensive hardening measures to restrict unauthorized network access to vulnerable services.",
  "technicalDetails": "The vulnerability is fundamentally classified as a buffer overflow, occurring when a vulnerable component within IBM AIX 7.2, IBM AIX 7.3, or IBM PowerVM VIOS 4.1 receives input data exceeding the allocated buffer capacity without adequate length validation.\nThe root cause stems from insecure memory handling routines that fail to enforce strict boundary checks on incoming data structures prior to memory copy operations.\nThe exploitation method involves a remote attacker crafting a malicious input sequence designed to overflow the target buffer, thereby corrupting adjacent memory structures such as return addresses, function pointers, or critical control data.\nThe attack flow initiates when the attacker transmits the malformed payload over the network to the vulnerable service running on the target system. Upon processing the input, the underlying component copies the excessive data into a fixed-size memory buffer.\nAs the buffer overflows, critical execution flow registers are overwritten with attacker-controlled values pointing to shellcode or malicious instructions embedded within the payload.\nWhen the affected function attempts to return execution or execute the corrupted pointer, control is redirected to the attacker's payload.\nThe vulnerable components reside within core networking or system management daemons of IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1.\nDepending on the specific network exposure and service configuration, the attack can be executed remotely over the network without requiring authentication or elevated privileges.\nPost-exploitation impact includes arbitrary code execution with the privileges of the compromised process, ranging from standard service accounts up to root-level privileges, enabling complete system takeover, data exfiltration, or further propagation across the network."
}