CVE-2026-17229 in IBM
Summary
by MITRE • 08/13/2026
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to an infinite loop.
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability affects IBM i operating systems versions 7.6, 7.5, 7.4, and 7.3, presenting a critical security risk that could be exploited by remote attackers to disrupt system availability. The flaw manifests as an infinite loop condition within the system's processing mechanisms, which when triggered can cause the affected components to consume excessive computational resources and ultimately lead to complete system unresponsiveness.
The technical nature of this vulnerability stems from improper input validation or control flow management within IBM i's core processes. When maliciously crafted data or requests are processed by the affected system components, they can cause the execution to enter an infinite loop where a particular code segment repeatedly executes without proper termination conditions. This condition typically occurs in network services, protocol handlers, or system call processing routines that fail to properly validate incoming data streams or request parameters.
From an operational impact perspective, this vulnerability represents a significant denial of service threat that can severely compromise business continuity and system availability. Remote attackers who successfully exploit this flaw can cause sustained system downtime, potentially affecting critical enterprise applications and services running on IBM i platforms. The infinite loop condition consumes CPU cycles and memory resources continuously, making the system unresponsive to legitimate users and administrative operations while potentially causing cascading failures in dependent systems.
The vulnerability aligns with CWE-835 which addresses the issue of infinite loops or infinite recursion in software implementations. From an attacker perspective, this weakness maps to several ATT&CK techniques including TA0040 (Execution) and TA0043 (Reconnaissance) as attackers may first discover the vulnerability through reconnaissance activities before attempting exploitation. The remote attack surface increases the risk profile significantly as no local access is required for exploitation.
Organizations should implement immediate mitigations including applying the latest IBM security patches and fixes released for these specific IBM i versions. Network segmentation and access controls should be strengthened to limit potential attack vectors, while monitoring systems should be deployed to detect unusual CPU utilization patterns that might indicate exploitation attempts. Additionally, implementing rate limiting on network services and validating all incoming data streams can help reduce the likelihood of successful exploitation. System administrators should also conduct thorough testing of patches in non-production environments before deployment to ensure no unintended side effects occur in their specific configurations.