GHSA-PF8H-4WMF-9GV4
Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-05-06 21:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-31701"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-01T14:16:20Z",
"severity": "MODERATE"
},
"details": "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-\u003echip.dev but never takes a reference on it. The card\u0027s\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-\u003echip.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-\u003echip.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.",
"id": "GHSA-pf8h-4wmf-9gv4",
"modified": "2026-05-06T21:31:31Z",
"published": "2026-05-01T15:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31701"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1d9be95aee6c6246a21752e60c9519902649f482"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/59b622a043cffc58b7638cd85ae6c30a0904f8e6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6473ed16df1fe88051140611b3eb9a49be7f429e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/80bb50e2d459213cccff3111d5ef98ed4238c0d5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f6634af5de728a46792f674a66d7843570cb68f7"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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