CVE-2026-31701 - ALSA: caiaq: take a reference on the USB device in create_card()

CVE-2026-31701 - ALSA: caiaq: take a reference on the USB device in create_card()

https://cvefeed.io/rssfeed/latest.atom / Fri, 05/01/2026 - 17:21
CVE ID :CVE-2026-31701
Published : May 1, 2026, 1:56 p.m. | 19 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: take a reference on the USB device in create_card() The caiaq driver stores a pointer to the parent USB device in cdev->chip.dev but never takes a reference on it. The card's private_free callback, snd_usb_caiaq_card_free(), can run asynchronously via snd_card_free_when_closed() after the USB device has already been disconnected and freed, so any access to cdev->chip.dev in that path dereferences a freed usb_device. On top of the refcounting issue, the current card_free implementation calls usb_reset_device(cdev->chip.dev). A reset in a free callback is inappropriate: the device is going away, the call takes the device lock in a teardown context, and the reset races with the disconnect path that the callback is already cleaning up after. Take a reference on the USB device in create_card() with usb_get_dev(), drop it with usb_put_dev() in the free callback, and remove the usb_reset_device() call.
Severity: 0.0 | NA
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