CVE-2023-53811 is a vulnerability identified in the Linux kernel that affects the irdma driver. It concerns the misuse of MSIX vectors, which are utilized to manage interrupts for online CPUs. The vulnerability arises when the number of MSIX vectors exceeds the permissible limit, which is defined as the number of online CPUs plus one. When this limit is breached, the kernel generates a warning indicating that the driver is attempting to set a CPU mask larger than the maximum allowed CPU IDs.
This vulnerability allows a scenario where a misconfiguration can lead to potential instability in the kernel, causing unnecessary warnings and possibly affecting the performance of the irdma driver. The kernel's response is a warning stack trace that provides developers with insights into the issue. The warning highlights the specific CPU and process ID involved, facilitating debugging and resolution.
The severity of CVE-2023-53811 is currently classified as unknown, as it has not been assigned a CVSS score due to its deferred status. This indicates that, while it is recognized, there is no immediate action required from organizations. However, continuous monitoring for updates and patches is advisable to ensure that systems remain secure.
Organizations should prioritize reviewing their systems for any related configurations and remain vigilant for future updates from the Linux kernel community. Even though the immediate risk appears low, maintaining a proactive stance on kernel vulnerabilities is critical for overall system integrity.
As of now, CVE-2023-53811 has not been actively exploited in the wild, as indicated by the absence of known exploits. Organizations are encouraged to keep abreast of any developments related to this vulnerability, especially as patches or updates become available.
The urgency for defenders regarding this specific vulnerability is low. However, it is essential to integrate regular vulnerability assessments as part of a comprehensive security strategy.
In conclusion, while CVE-2023-53811 is classified as deferred and currently poses no immediate threat, organizations should stay informed about this and similar vulnerabilities to maintain robust security postures.
Vulnerability Details
The official description of this vulnerability states that it involves the RDMA/irdma driver in the Linux kernel, specifically related to the capping of MSIX vectors. This limit is set to num_online_cpus() + 1 to prevent issues during driver operation.
The vulnerability was published on December 9, 2025, and is currently deferred, indicating that it is not assigned a CVSS score yet. No specific products or affected versions are documented in the available data.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of MSIX vector assignments within the irdma driver. The driver attempts to increase the number of MSIX vectors beyond the defined limit based on the number of online CPUs. This action leads the kernel to generate a warning, indicating a potential misconfiguration.
The attack vector for this vulnerability is categorized as unknown, as the specific conditions that would allow for exploitation have not been clearly defined. The complexity of the attack is low, given that it does not require elevated privileges or user interaction to trigger the warning stack.
In terms of impact, the vulnerability does not directly compromise confidentiality, integrity, or availability, but it may lead to operational inefficiencies due to excessive kernel warnings.
Risk & Impact Analysis
Risk to organizations includes potential instability in the kernel and operational inefficiencies due to excessive warning messages. While there is no immediate threat, organizations should monitor their systems for any related issues.
Given the low CVSS score and deferred status, organizations may address this vulnerability in their routine maintenance cycles. However, proactive monitoring and readiness to apply patches is recommended.
For organizations relying on the Linux kernel, it's critical to maintain up-to-date systems and be aware of any changes in the kernel community regarding this and similar vulnerabilities.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
As of now, no specific versions or products have been identified as affected by CVE-2023-53811. Organizations should consider all versions of the Linux kernel prior to the release of any patches for this vulnerability.
Mitigation & Remediation
Organizations should monitor for updates related to CVE-2023-53811 and apply patches as they become available. Regularly reviewing and updating the Linux kernel will help mitigate potential risks associated with this vulnerability.
For further guidance, organizations may benefit from engaging in penetration testing to uncover similar vulnerabilities and ensure robust security measures are in place.
Detection Guidance
To detect this vulnerability, organizations should enable logging for kernel warnings and monitor for unusual CPU affinity settings that exceed the defined limits. Observing any abnormal behavior in the irdma driver could indicate potential misconfigurations.
AppSecure Threat Intelligence Insight
CVE-2023-53811 represents a scenario where kernel driver misconfigurations can lead to operational inefficiencies. The trend of vulnerabilities associated with driver configurations highlights the need for rigorous testing and validation processes in software development.
Organizations should learn from this incident to strengthen their configuration management practices and ensure that all drivers are properly configured to prevent similar issues in the future.
For additional insights into threat intelligence, organizations can explore resources on penetration testing methodology and best practices in vulnerability management through the AppSecure blog.
Security teams should also consider reviewing their engagement strategies by consulting resources on vulnerability management programs to foster a proactive security posture.
Moreover, organizations can gain insights into threat modeling and risk assessments by reviewing articles on API penetration testing and its implications for modern security frameworks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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