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 heap-based buffer overflow.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-20T22:17:17.267Z",
  "pubdate": "2026-08-20T22:17:17.267Z",
  "executiveSummary": "This vulnerability is classified as a heap-based buffer overflow affecting IBM AIX and IBM PowerVM VIOS. The flaw arises from improper bounds checking within vulnerable software components, allowing a remote attacker to execute arbitrary code on the underlying system. Successful exploitation of this vulnerability leads to a severe impact on system integrity, confidentiality, and availability, potentially granting the attacker complete control over the affected operating system or virtualization instance. The affected products include IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS version 4.1. Risk implications are critical, as remote code execution (RCE) vulnerabilities present an immediate threat to enterprise environments by bypassing security perimeters. The attacker capabilities include unauthorized code execution without requiring explicit privileges, depending on the network exposure and service configuration. While specific authentication requirements and complex exploitation prerequisites are not explicitly detailed in the baseline description, heap-based buffer overflows typically require the attacker to send specially crafted network packets or input data to a vulnerable parsing routine or daemon running with elevated privileges, thereby triggering the memory corruption condition.",
  "technicalDetails": "The technical root cause of this vulnerability is a heap-based buffer overflow condition residing within the memory management handling of the affected IBM AIX and IBM PowerVM VIOS components. A heap-based buffer overflow occurs when an application allocates memory dynamically on the heap and subsequently writes data past the allocated boundaries due to insufficient length validation or bounds checking. In the context of IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1, this memory corruption flaw can be triggered remotely if the vulnerable component processes untrusted inputs, network protocols, or serialized data structures without properly verifying input sizes against destination buffer allocations.\nThe attack flow begins when a remote attacker transmits a specially crafted payload targeting the vulnerable service or daemon. As the target component parses the malformed input, the lack of rigorous boundary verification causes the oversized data to overflow the dynamically allocated heap buffer. This over-write corrupts adjacent heap metadata, control structures, function pointers, or application-specific data objects stored adjacently in memory. By carefully structuring the payload, an advanced attacker can manipulate heap metadata or overwrite critical execution pointers.\nWhen the corrupted pointer or function reference is subsequently dereferenced by the application, execution flow is hijacked and redirected to attacker-controlled shellcode or arbitrary instructions contained within the payload. Given that system daemons and core operating system components often operate with elevated privileges, the execution of arbitrary code occurs within the security context of the compromised process, frequently yielding root or high-privileged system access. The network exposure of this vulnerability depends on the specific listening ports and exposed services associated with the affected components in the AIX and VIOS environments. Post-exploitation impact includes full system compromise, deployment of persistent malware, lateral movement across the network, and unauthorized access to sensitive enterprise data residing on the partitioned virtualization layers or logical partitions."
}