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IBM AIX 7.2, 7.3, and IBM PowerVM VIOS 4.1 are susceptible to a stack-based buffer overflow vulnerability identified as CVE-2026-17138. This flaw stems from inadequate boundary checks when copying data to a fixed-size stack buffer. Specifically, a remote, unauthenticated attacker can send a specially crafted request that exceeds the allocated buffer size, overflowing adjacent memory on the stack. This overflow corrupts critical control data, such as return addresses and saved frame pointers, allowing the attacker to hijack the program’s execution flow. Successful exploitation enables arbitrary code execution with the privileges of the affected process, typically root or system-level access, leading to full system compromise.
The vulnerability exists in an unknown function within IBM AIX and PowerVM VIOS. The attack vector is network-based, requiring no authentication and no user interaction. The technical details are not publicly disclosed; however, the exploitability is considered easy. IBM has released a security advisory and recommends applying the cumulative security updates included in Service Packs (SPs) and Fix Packs (FPs). The vulnerability is classified as CWE-121: Stack-based Buffer Overflow. Given the widespread use of AIX in enterprise environments and VIOS in virtualized Power Systems, this vulnerability poses a significant risk.
DailyCVE Form:
Platform: IBM AIX / PowerVM VIOS
Version: 7.2, 7.3, 4.1
Vulnerability: Stack Buffer Overflow
Severity: Critical (CVSS 9.8)
Date: August 20, 2026
Prediction: Patch available August 2026
What Undercode Say:
Check AIX version oslevel -s Check VIOS version ioslevel Verify if the system is vulnerable (example, not a direct check) No public exploit available, but monitor IBM security bulletins. IBM recommends applying cumulative security updates. Apply fixes via Service Packs (SPs) and Fix Packs (FPs). Example: Download and install the latest AIX SP from IBM Fix Central. For VIOS, upgrade to version 4.1.0.50 or later.
Exploit: (Educational Purposes!)
No public exploit code is available for CVE-2026-17138. Exploitation would involve crafting a network packet that triggers the buffer overflow in the vulnerable service. The attacker would need to identify the vulnerable function and the exact offset to overwrite the return address. A successful exploit would execute shellcode to grant the attacker remote access with root privileges. The exploit price is estimated between $5,000 and $25,000.
Protection:
- Apply the cumulative security updates provided by IBM in the latest Service Packs (SPs) and Fix Packs (FPs) for AIX and VIOS.
- Restrict network access to AIX and VIOS management interfaces using firewalls to limit exposure.
- Monitor IBM security bulletins for additional mitigation guidance.
- Consider network-based intrusion detection/prevention systems (IDS/IPS) to detect anomalous traffic patterns.
Impact:
Successful exploitation allows a remote, unauthenticated attacker to execute arbitrary code on the affected system. This can lead to complete loss of confidentiality, integrity, and availability. Attackers could install malware, exfiltrate sensitive data, disrupt operations, or use compromised systems as a pivot point for further attacks within the enterprise network. Given the critical role of AIX and VIOS in many enterprise environments, the impact is severe.
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Sources:
Reported By: nvd.nist.gov
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