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CVE-2026-18828 is a vulnerability affecting IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS version 4.1. The flaw resides in the way these operating systems handle certain network requests. Due to insufficient bounds checking, a remote attacker can send a specially crafted packet that triggers a stack-based buffer overflow. This occurs when data is written beyond the allocated buffer on the call stack, overwriting critical control information such as return addresses or saved frame pointers. The vulnerability is classified under CWE-787: Out-of-bounds Write. Exploitation does not require authentication, and the attack can be launched from an adjacent network with low complexity. The primary impact is a denial of service (DoS), leading to system crashes or instability, although in some scenarios, it could potentially allow for arbitrary code execution. The vulnerability was reserved on August 4, 2026, and published on August 20, 2026. IBM has acknowledged the issue and has provided security updates as part of cumulative maintenance packages. No public exploit is currently available, and the technical details remain undisclosed. The CVSS v3.1 base score assigned by IBM is 5.4 (Medium), with the vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.
DailyCVE Form:
Platform: IBM AIX, PowerVM VIOS
Version: 7.2, 7.3, 4.1
Vulnerability: Stack Buffer Overflow
Severity: Medium (5.4)
Date: 2026-08-20
Prediction: 2026-09-15
What Undercode Say:
Analytics on this CVE show a moderate but concerning risk profile. The following commands can be used to check for affected versions and monitor for potential exploitation attempts.
Check AIX version oslevel -s Check VIOS version ioslevel Monitor for unusual network activity on adjacent networks tcpdump -i en0 -nn -s 0 -c 100 Check for core dumps indicating potential crashes ls -la /var/adm/ras/.core
Exploit: (Educational Purposes!)
A proof-of-concept exploit would involve crafting a network packet that exceeds the expected buffer size when processed by the vulnerable service. The following Python script demonstrates a generic buffer overflow concept:
import socket target_ip = "192.168.1.100" target_port = 12345 Craft a payload with excessive data payload = b"A" 1024 Oversized payload to trigger overflow sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((target_ip, target_port)) sock.send(payload) sock.close()
Protection:
- Apply the security updates provided by IBM in the latest Service Packs (SPs) and Fix Packs (FPs).
- Restrict network access to the affected systems, allowing only trusted hosts to connect.
- Implement network intrusion detection/prevention systems (IDS/IPS) to filter or alert on anomalous traffic patterns.
- Monitor system logs for unexpected crashes or service interruptions.
Impact:
- Denial of Service: Successful exploitation can cause the target system to crash or become unresponsive.
- System Instability: Repeated attacks can lead to frequent reboots and service disruptions.
- Potential Code Execution: While the primary impact is DoS, buffer overflows can sometimes be leveraged to execute arbitrary code, posing a more severe threat.
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Sources:
Reported By: nvd.nist.gov
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