Infinite Recursion Vulnerability in Linux Kernel - ATM Clip Push Function
Summary
CVE-2025-38459: In the Linux kernel, the following vulnerability has been resolved: atm: clip: Fix infinite recursive call of clip_push(). 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 many operating systems, providing essential services for hardware and software interactions. It is known for its stability, performance, and security features. The ATM (Asynchronous Transfer Mode) subsystem within the kernel facilitates the handling of ATM networks. This vulnerability specifically affects the clip push function within the ATM subsystem, which can lead to severe issues if exploited.
Vulnerability Detail
In the Linux kernel, a vulnerability exists in the ATM subsystem's clip push function, which can lead to an infinite recursive call when the ioctl(ATMARP_MKIP) command is issued multiple times. This occurs because the second call to clip_push() overwrites the previous function pointer, causing a stack overflow when the socket is closed and the function is called with a NULL skb. The vulnerability was reported by syzbot and can lead to system crashes or denial of service if exploited.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid calling ioctl(ATMARP_MKIP) more than once to prevent triggering the infinite recursion. Additionally, ensuring that the socket is properly managed and closed can help mitigate the risk until a patch is applied.
Conclusion
The infinite recursion vulnerability in the Linux kernel's ATM subsystem poses significant risks to system stability and security. Users are strongly advised to update their kernel to the latest patched version to mitigate these risks. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time.
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FAQ
The vulnerability allows for an infinite recursive call in the ATM subsystem, which can lead to a stack overflow and system crashes.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
Exploitation of this vulnerability can lead to system crashes, denial of service, and potential data loss.
Yes, users should update their Linux kernel to the latest version available for their Debian distribution to apply the necessary patches.
As a temporary measure, avoid issuing the ioctl(ATMARP_MKIP) command multiple times and ensure proper socket management.
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