In the Linux kernel, the following vulnerability has been resolved: iommufd: Do not corrupt the pfn list when doing batch carry. If batch->end is 0 then setting npfns[0] before computing the new value of pfns will fail to adjust the pfn and result in various page accounting corruptions. It should be ordered after.
This vulnerability allows for various kinds of page meta-data corruption related failures. The associated warning message indicates that the issue may lead to critical system instability.
With a CVSS score of 5.5, classified as medium severity, organizations using affected versions of the Linux kernel should take immediate action. The risk to organizations includes potential system crashes and data corruption, with a high impact on availability.
Currently, there are no confirmed public exploits available for this vulnerability, but organizations should remain vigilant. As this vulnerability could be exploited locally, organizations should prioritize patching immediately.
The urgency for defenders is clear; systems should be updated to mitigate this risk effectively.
Vulnerability Details
The vulnerability is identified as CVE-2023-53236. The official description indicates that it concerns the iommufd functionality in the Linux kernel. It was published on September 15, 2025, and has since been modified. The affected product is the Linux kernel, particularly versions 6.2 to 6.3-rc5, excluding version 6.2.11.
The CVSS score of 5.5 indicates a medium severity level, with the attack vector being local. This means that an attacker would require local access to exploit the vulnerability, emphasizing the need for physical or administrative access to the system.
Technical Analysis
The root cause of this vulnerability lies in how the Linux kernel manages page frame numbers (PFNs) during batch processing. Specifically, if the batch->end is zero, the incorrect ordering of operations causes corruption in page accounting metadata.
The attack vector is local, meaning that an attacker would need to have local access to the system to exploit this vulnerability. The attack complexity is low, with only low-level privileges required for exploitation.
No user interaction is required, making it easier for an attacker to exploit this vulnerability. The confidentiality and integrity impacts are none, but the availability impact is high, indicating that successful exploitation may lead to system crashes or resource outages.
Risk & Impact Analysis
The real-world risk associated with CVE-2023-53236 is significant. Given its local attack vector and the potential for high availability impact, organizations utilizing affected versions of the Linux kernel may face system instability, leading to potential downtime and loss of productivity.
Organizations should assess their deployment of the Linux kernel and understand the blast radius of this vulnerability. Immediate patching is crucial, especially given the potential for exploitation in environments where users have local access.
According to the CVSS scoring, the need for remediation should be prioritized at a medium level, reflecting the necessity for timely updates and the potential consequences of delayed action.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the Linux kernel include all versions from 6.2 to 6.3-rc5, excluding version 6.2.11. Organizations are advised to review their systems for these specific versions.
Mitigation & Remediation
Organizations should prioritize applying the patches available for the Linux kernel to mitigate the impact of this vulnerability. Specific patches can be found at Pentesting as a Service or through the Linux kernel's official channels.
Workarounds may include restricting local access to systems running vulnerable kernel versions until patches are applied. Additionally, organizations should consider implementing configuration hardening to limit exposure.
Detection Guidance
Organizations should monitor logs for unusual system behavior related to memory management and page faults. Behavioral anomalies indicating potential exploitation should be logged and investigated immediately.
AppSecure Threat Intelligence Insight
CVE-2023-53236 underscores the importance of rigorous testing and validation in software development, particularly in kernel-level components. The fact that no public exploits have been identified should not lead to complacency. Organizations should remain proactive in their security posture.
For further insights on vulnerability management, organizations may find value in reading about vulnerability management programs, and strategies for continuous security testing.
Additionally, organizations should consider consulting our guide on penetration testing methodologies to enhance their overall security strategies.
Lastly, maintaining awareness of new vulnerabilities, such as this one, is critical for effective security management.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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