Deadlock Vulnerability in Linux Kernel's USB Type-C DisplayPort Handling
Summary
CVE-2025-38404: In the Linux kernel, the following vulnerability has been resolved: usb: typec: displayport: Fix potential deadlock The deadlock can occur due to a recursive lock acquisition of cros_typec_altmode_data::mutex. 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 interaction. It supports a wide range of functionalities, including device management, process scheduling, and memory management. This vulnerability specifically affects the USB Type-C DisplayPort handling, where a recursive lock acquisition can lead to a deadlock, potentially freezing the system and disrupting normal operations.
Vulnerability Detail
The vulnerability, identified as CVE-2025-38404, arises from a recursive lock acquisition of the mutex in the cros_typec_altmode_data structure. The deadlock occurs when the cros_typec_altmode_exit function attempts to acquire the mutex while it is already held by the cros_typec_altmode_work function. This can lead to system instability and unresponsiveness, particularly in environments utilizing USB Type-C DisplayPort functionality.
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. Users are advised to apply the patch as soon as it becomes available to prevent potential deadlock situations.
Conclusion
The CVE-2025-38404 vulnerability in the Linux kernel poses a significant risk of deadlock due to improper mutex handling in USB Type-C DisplayPort functionalities. Users are strongly encouraged to update their systems to the patched version to ensure stability and security.
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FAQ
CVE-2025-38404 is a vulnerability in the Linux kernel that can cause a deadlock due to recursive lock acquisition in USB Type-C DisplayPort handling.
This vulnerability can lead to system instability and unresponsiveness, particularly when using USB Type-C DisplayPort functionalities.
Yes, a patch is available for Debian 13 in version 6.12.37-1. Users should update their Linux kernel package to this version or later.
You can use tools like Vulert, which monitors and alerts for open-source vulnerabilities in real-time. You can check your application against this vulnerability using the Vulert playground without any signup.
While there are no specific workarounds, it is crucial to monitor your system for unusual behavior and apply the patch as soon as possible to mitigate risks.
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