CVE-2026-17195 in AIX
Summary
by MITRE • 08/21/2026
IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to cause a denial of service due to an out-of-bounds write.
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Analysis
by VulDB Data Team • 08/21/2026
The vulnerability identified in IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM Virtual I/O Server (VIOS) version 4.1, represents a critical memory management flaw classified as an out-of-bounds write. This type of defect occurs when software writes data to a memory location outside the boundaries of the intended buffer or array structure. In the context of operating systems and virtualization layers like AIX and PowerVM VIOS, such errors are particularly dangerous because they can corrupt critical system structures, leading to unpredictable behavior ranging from application crashes to complete kernel panics. The presence of this flaw indicates a failure in boundary checking mechanisms within the affected components, allowing data intended for one memory region to overwrite adjacent areas that may contain control flow information or other sensitive operational data.
From an attacker perspective, this vulnerability is exploitable by local users who have already gained access to the system environment. Unlike remote code execution vulnerabilities that can be triggered over a network without authentication, out-of-bounds write issues in operating systems typically require the adversary to possess valid credentials and interact with specific services or processes running on the host machine. The primary impact of exploiting this flaw is a denial of service condition. By triggering the memory corruption through crafted inputs or sequences of operations, an attacker can cause the affected system component to crash, thereby disrupting availability for legitimate users and potentially taking down critical infrastructure services hosted on that hardware. While out-of-bounds writes can sometimes lead to arbitrary code execution if specific conditions are met, such as overwriting function pointers with controlled data, the reported impact focuses on stability disruption rather than privilege escalation or remote command injection in this specific instance.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) category CWE-787: Out-of-bounds Write, which describes situations where a write operation targets memory outside of the allocated buffer boundaries. It also relates to CWE-120: Buffer Overflow, specifically when the overflow results in writing beyond the end of the destination buffer. In terms of offensive security frameworks like MITRE ATT&CK, this flaw could be leveraged during techniques associated with Defense Evasion or Impact categories, particularly those involving system availability disruption through resource exhaustion or crash induction. For defenders and administrators managing IBM Power Systems environments, mitigating this risk requires strict adherence to patch management policies. Applying the latest service packs and security updates provided by IBM is essential to address these memory safety issues. Additionally, implementing least-privilege access controls can limit the potential impact by restricting which local users have the ability to execute code or interact with vulnerable system components, thereby reducing the attack surface available for exploitation of this out-of-bounds write condition.