USB Audio Device Vulnerability in Linux Kernel

CVE-2025-40085

What is CVE-2025-40085?

A vulnerability in the Linux kernel related to ALSA's handling of USB audio devices can cause a NULL pointer dereference during the attempt to register an invalid USB audio device. The issue arises in the try_to_register_card function, where the return value of usb_ifnum_to_if() is incorrectly used without prior validation. This oversight could lead to system crashes or unexpected behavior, highlighting the need for strict validation checks before interfacing with USB components.

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