Kernel Vulnerability in Linux Package: Map Leak in fastrpc_put_args
Summary
DEBIAN-CVE-2025-40036: In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: fix possible map leak in fastrpc_put_args copy_to_user() failure would cause an early return without cleaning up the fdlist, which has be... 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 system resources and hardware interactions. It provides essential services for all other parts of the operating system. This vulnerability affects multiple Debian versions (11, 12, 13, and 14) and is related to the fastrpc subsystem, which facilitates communication between the host and DSP (Digital Signal Processor).
Vulnerability Detail
In the Linux kernel, a vulnerability was identified in the fastrpc subsystem where a failure in the copy_to_user() function could lead to an early return without properly cleaning up the fdlist. This oversight could result in a map leak, potentially allowing unauthorized access to memory resources. The vulnerability is critical as it can compromise system integrity and lead to data exposure.
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. The best course of action is to apply the available updates as soon as they are released.
Conclusion
The vulnerability CVE-2025-40036 in the Linux kernel's fastrpc subsystem poses a significant risk due to potential map leaks. Users are strongly advised to update their systems to the latest patched versions to ensure their systems remain secure. Monitoring tools like Vulert can assist in identifying vulnerabilities in real-time.
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FAQ
CVE-2025-40036 is a vulnerability in the Linux kernel related to the fastrpc subsystem, which can lead to a map leak due to improper cleanup of resources.
This vulnerability can compromise system integrity and potentially expose sensitive data by allowing unauthorized access to memory resources.
Debian versions 11, 12, 13, and 14 are affected by this vulnerability.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check if your application is affected without needing to sign up.
While there are no specific workarounds, it is crucial to prioritize updating your system to mitigate the risk associated with this vulnerability as soon as possible.
References
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