CVE-2026-17470 in IBM
Summary
by MITRE • 09/04/2026
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to a buffer overflow.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in IBM i operating system versions 7.3 through 7.6 represents a critical security flaw rooted in improper memory management within the affected software components. Specifically, this issue manifests as a buffer overflow condition that can be triggered by a remote attacker without requiring prior authentication or user interaction under certain configurations. A buffer overflow occurs when a program writes more data to a fixed-length block of memory than it is designed to hold. In the context of IBM i systems, which serve as robust platforms for enterprise workloads and legacy applications, such an architectural weakness can be exploited by malicious actors sending specially crafted network requests or input sequences that exceed the allocated buffer boundaries. This exploitation leads to the overwriting of adjacent memory locations, potentially corrupting critical system data structures or control flow mechanisms.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration (CWE) identifier CWE-120, which classifies Buffer Copy without Checking Size of Input. The operational impact is primarily characterized by a denial of service scenario where the integrity and availability of the IBM i system are compromised. When the buffer overflow condition is successfully triggered, it typically results in application crashes or system instability, effectively rendering services unavailable to legitimate users. While modern operating systems employ various mitigations such as stack canaries and address space layout randomization, sophisticated attackers may still leverage this flaw to cause significant disruption. In severe cases, depending on how the overwritten memory affects execution flow, there is a theoretical risk of arbitrary code execution, although the primary reported impact remains denial of service due to system crashes or hangs.
This type of vulnerability falls under the MITRE ATT&CK framework category of Initial Access and Impact, specifically relating to techniques that disrupt availability rather than confidentiality or integrity directly in its immediate manifestation. Attackers may utilize this flaw as part of a broader campaign to degrade organizational productivity or as a distraction technique while other malicious activities occur elsewhere on the network. The remote nature of the exploit means that no physical access or local user privileges are required, significantly increasing the attack surface and risk profile for organizations relying on these IBM i versions.
To mitigate this vulnerability, immediate action is required from system administrators and security teams responsible for maintaining IBM i environments. The primary remediation strategy involves applying the latest available service updates and patches provided by IBM that address the specific buffer handling logic in question. Organizations should prioritize patching systems exposed to untrusted networks or the internet where possible. Additionally, implementing network-level controls such as firewalls and intrusion detection systems can help filter out malicious traffic patterns associated with exploitation attempts before they reach the vulnerable application layer. Regular vulnerability scanning and penetration testing are also recommended to identify similar weaknesses in custom applications running on these platforms. Maintaining a rigorous patch management lifecycle is essential to ensure that known vulnerabilities like this one do not remain exploitable for extended periods, thereby preserving the security posture of critical enterprise infrastructure.