CVE-2026-31701 (GCVE-0-2026-31701)
Vulnerability from cvelistv5
Published
2026-05-01 13:56
Modified
2026-06-14 17:43
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4dd821dcbfcecf7af6a08370b0b217cde2818acf
Version: cadf1d8e9ddcd74584ec961aeac14ac549b261d8
Version: 237f3faf0177bdde728fa3106d730d806436aa4d
Version: 4507a8b9b30344c5ddd8219945f446d47e966a6d
Version: a3f9314752dbb6f6aa1f0f2b4c58243bda800738
Version: b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c
Version: b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c
Version: b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c
Version: 3993edf44d3df7b6e8c753eac6ac8783473fcbab
Version: ebad462eec93b0f701dfe4de98990e7355283801
Version: dd0de8cb708951cebf727aa045e8242ba651bb52
Version: 5.10.231   ≤
Version: 5.15.174   ≤
Version: 6.1.120   ≤
Version: 6.6.64   ≤
Version: 6.12.2   ≤
Version: 4.19.325   ≤
Version: 5.4.287   ≤
Version: 6.11.11   ≤
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      "descriptions": [
        {
          "lang": "en",
          "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-\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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:43:40.642Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/493b3a682ededc804555755f5d2193201339612d"
        },
        {
          "url": "https://git.kernel.org/stable/c/dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e"
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          "url": "https://git.kernel.org/stable/c/ac7345f68cda6989016d85d63f7b244c064aa8f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6634af5de728a46792f674a66d7843570cb68f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d9be95aee6c6246a21752e60c9519902649f482"
        },
        {
          "url": "https://git.kernel.org/stable/c/6473ed16df1fe88051140611b3eb9a49be7f429e"
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          "url": "https://git.kernel.org/stable/c/59b622a043cffc58b7638cd85ae6c30a0904f8e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/80bb50e2d459213cccff3111d5ef98ed4238c0d5"
        }
      ],
      "title": "ALSA: caiaq: take a reference on the USB device in create_card()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31701",
    "datePublished": "2026-05-01T13:56:00.869Z",
    "dateReserved": "2026-03-09T15:48:24.132Z",
    "dateUpdated": "2026-06-14T17:43:40.642Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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