CVE-2026-31701
Estado: ModificadaMedia (5.5)—
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).
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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
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/1d9be95aee6c6246a21752e60c9519902649f482
- https://git.kernel.org/stable/c/493b3a682ededc804555755f5d2193201339612d
- https://git.kernel.org/stable/c/59b622a043cffc58b7638cd85ae6c30a0904f8e6
- https://git.kernel.org/stable/c/6473ed16df1fe88051140611b3eb9a49be7f429e
- https://git.kernel.org/stable/c/80bb50e2d459213cccff3111d5ef98ed4238c0d5
- https://git.kernel.org/stable/c/ac7345f68cda6989016d85d63f7b244c064aa8f6
- https://git.kernel.org/stable/c/dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e
- https://git.kernel.org/stable/c/f6634af5de728a46792f674a66d7843570cb68f7
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: take a reference on the USB device in create_card()\n\nThe caiaq driver stores a pointer to the parent USB device in\ncdev->chip.dev but never takes a reference on it. The card's\nprivate_free callback, snd_usb_caiaq_card_free(), can run\nasynchronously via snd_card_free_when_closed() after the USB\ndevice has already been disconnected and freed, so any access to\ncdev->chip.dev in that path dereferences a freed usb_device.\n\nOn top of the refcounting issue, the current card_free implementation\ncalls usb_reset_device(cdev->chip.dev). A reset in a free callback\nis inappropriate: the device is going away, the call takes the\ndevice lock in a teardown context, and the reset races with the\ndisconnect path that the callback is already cleaning up after.\n\nTake a reference on the USB device in create_card() with\nusb_get_dev(), drop it with usb_put_dev() in the free callback,\nand remove the usb_reset_device() call."
}
],
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