Kernel NULL Pointer Dereference Vulnerability in Linux Package
Summary
DEBIAN-CVE-2025-40092: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Refactor bind path to use free() After an bind/unbind cycle, the ncm->notify_req is left stale. Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware and system resources. It provides essential services for all other parts of the system, including process management, memory management, and device control. This vulnerability affects multiple Debian versions of the Linux kernel, which is critical for system stability and security.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the USB gadget framework, specifically within the f_ncm driver. After a bind/unbind cycle, the ncm->notify_req is left in a stale state. If a subsequent bind operation fails, the error handling mechanism attempts to free this stale request, resulting in a NULL pointer dereference when accessing ep->ops->free_request. This can lead to system crashes and instability, as it causes the kernel to attempt to access an invalid memory address.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the patch as soon as it becomes available.
Conclusion
The CVE-2025-40092 vulnerability in the Linux kernel represents a significant risk for users of affected Debian versions. It is essential to apply the necessary updates to ensure system stability and security. Regular monitoring and timely updates are critical in maintaining a secure environment.
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FAQ
CVE-2025-40092 is a vulnerability in the Linux kernel's USB gadget framework that can cause a NULL pointer dereference, leading to system crashes.
Debian versions 11, 12, 13, and 14 are affected by this vulnerability.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risk of exploitation.
This vulnerability can lead to system instability and crashes, which may expose the system to further attacks or data loss.
References
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