ALSA: caiaq: take a reference on the USB device in create_card()

Summary

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.

Timeline

1. May 1, 2026, 1:56 PM UTCCVE published
2. Jun 14, 2026, 5:43 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 5.10.231 · fixed in 5.10.258; From 5.15.174 · fixed in 5.15.209; From 6.1.120 · fixed in 6.1.175; From 6.6.64 · fixed in 6.6.136; From 6.12.2 · fixed in 6.12.84; From 4.19.325 · fixed in 4.20; From 5.4.287 · fixed in 5.5; From 6.11.11 · fixed in 6.12

• Linux Linux

  6.13

References 8