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IBM AIX versions 7.2 and 7.3, alongside IBM PowerVM Virtual I/O Server (VIOS) version 4.1, are affected by a stack-based buffer overflow vulnerability identified as CVE-2026-17425. This flaw stems from improper memory management within critical system components. Specifically, the software fails to perform adequate bounds checking before copying input data into a statically allocated memory region on the call stack. An unauthenticated remote attacker with network access can exploit this by sending specially crafted requests or packets that exceed the allocated buffer size.
When the overflow occurs, adjacent memory on the stack—including critical control data such as return addresses and function pointers—is overwritten with malicious or excessive data. This corruption typically causes the affected application or system component to crash immediately upon processing the malformed input. The primary operational impact is a denial of service (DoS) condition, leading to system instability and unavailability. In enterprise environments where AIX and PowerVM VIOS serve as foundational infrastructure for critical workloads, such downtime can disrupt business operations and cause significant financial and reputational damage.
While stack buffer overflows are historically associated with arbitrary code execution, this specific manifestation emphasizes system crashes rather than direct remote code execution. However, the underlying memory corruption could theoretically be leveraged further in complex attack chains if other conditions align. The vulnerability maps to CWE-121 (Stack-based Buffer Overflow) and CWE-787 (Out-of-bounds Write). IBM has assigned a CVSS v3.1 base score of 7.5 (HIGH) with the vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The NVD has not yet provided its own CVSS 4.0 assessment. Given the network attack vector, low complexity, and no required privileges, this vulnerability poses a serious threat to unpatched systems.
DailyCVE Form:
Platform: IBM AIX / PowerVM VIOS
Version: 7.2, 7.3 / 4.1
Vulnerability: Stack Buffer Overflow
Severity: HIGH (7.5 CVSS)
Date: August 20, 2026
Prediction: September 2026
What Undercode Say:
Check AIX version oslevel -s Check VIOS version ioslevel Verify if patch is installed (example) lslpp -L | grep -i 301610mc Check for listening services on vulnerable ports netstat -an | grep LISTEN Monitor for crash logs errpt -a | grep -i buffer
Exploit: (Educational Purposes!)
A remote attacker could craft a malicious packet with a payload larger than the expected buffer size and send it to the vulnerable service on AIX or VIOS. Upon receipt, the service copies the oversized data into a fixed-length stack buffer without validation, overwriting the return address and causing a segmentation fault. This results in an immediate crash of the service or the entire system, leading to a denial of service. The exploit does not require authentication and can be launched from any network-accessible position.
Protection:
- Apply the security patch provided by IBM (refer to IBM Security Advisory and fix pack 301610mc.260424.epkg.Z).
- Implement network-level controls such as intrusion prevention systems (IPS) to detect and block malformed packets.
- Restrict network access to AIX and VIOS management interfaces using firewalls and access control lists (ACLs).
- Regularly scan for vulnerabilities and maintain a robust patch management lifecycle.
Impact:
- Availability: Complete system or service crash, leading to prolonged downtime for enterprise applications and virtualized workloads.
- Operations: Disruption of critical business processes that depend on AIX and PowerVM infrastructure.
- Security Posture: While primarily a DoS, the underlying memory corruption could be chained with other vulnerabilities to achieve remote code execution, escalating the overall risk.
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Sources:
Reported By: nvd.nist.gov
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