CVE-2026-31701
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.
Does this matter?
Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.12% probability · 2th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1d9be95aee6c6246a21752e60c9519902649f482Patch
- https://git.kernel.org/stable/c/493b3a682ededc804555755f5d2193201339612d
- https://git.kernel.org/stable/c/59b622a043cffc58b7638cd85ae6c30a0904f8e6Patch
- https://git.kernel.org/stable/c/6473ed16df1fe88051140611b3eb9a49be7f429ePatch
- https://git.kernel.org/stable/c/80bb50e2d459213cccff3111d5ef98ed4238c0d5Patch
- https://git.kernel.org/stable/c/ac7345f68cda6989016d85d63f7b244c064aa8f6
- https://git.kernel.org/stable/c/dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e
- https://git.kernel.org/stable/c/f6634af5de728a46792f674a66d7843570cb68f7Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.