CVE-2024-56531 is a medium severity vulnerability in the Linux kernel ALSA caiaq driver. The issue arises because the USB disconnect callback uses snd_card_free(), which waits for all file descriptors to close and can block USB ioctl operations, potentially causing a soft lockup. The fix replaces snd_card_free() with snd_card_free_when_closed(), which returns immediately and defers resource release until the last close, preventing blocking during USB disconnection.