CVE-2026-46048 (GCVE-0-2026-46048)
Vulnerability from cvelistv5
Published
2026-05-27 12:57
Modified
2026-06-14 17:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: fix usb_dev refcount leak on probe failure create_card() takes a reference on the USB device with usb_get_dev() and stores the matching usb_put_dev() in card_free(), which is installed as the snd_card's ->private_free destructor. However, ->private_free is only assigned near the end of init_card(), after several failure points (usb_set_interface(), EP type checks, usb_submit_urb(), the EP1_CMD_GET_DEVICE_INFO exchange, and its timeout). When any of those fail, init_card() returns an error to snd_probe(), which calls snd_card_free(card). Because ->private_free is still NULL, card_free() never runs, the usb_get_dev() reference is not dropped, and the struct usb_device leaks along with its descriptor allocations and device_private. syzbot reproduces this with a malformed UAC3 device whose only valid altsetting is 0; init_card()'s usb_set_interface(usb_dev, 0, 1) call fails with -EIO and triggers the leak. Move the ->private_free assignment into create_card(), immediately after usb_get_dev(), so that every error path reaching snd_card_free() balances the reference. card_free()'s callees (snd_usb_caiaq_input_free, free_urbs, kfree) already tolerate the partially-initialized state because the chip private area is zero-initialized by snd_card_new().
References
Impacted products
Vendor Product Version
Linux Linux Version: 493b3a682ededc804555755f5d2193201339612d
Version: dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e
Version: ac7345f68cda6989016d85d63f7b244c064aa8f6
Version: f6634af5de728a46792f674a66d7843570cb68f7
Version: 1d9be95aee6c6246a21752e60c9519902649f482
Version: 6473ed16df1fe88051140611b3eb9a49be7f429e
Version: 59b622a043cffc58b7638cd85ae6c30a0904f8e6
Version: 80bb50e2d459213cccff3111d5ef98ed4238c0d5
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   Linux Linux Version: 6.6.136   ≤
Version: 6.12.84   ≤
Version: 6.18.25   ≤
Version: 7.0.2   ≤
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{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "sound/usb/caiaq/device.c"
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          "vendor": "Linux",
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: fix usb_dev refcount leak on probe failure\n\ncreate_card() takes a reference on the USB device with usb_get_dev()\nand stores the matching usb_put_dev() in card_free(), which is\ninstalled as the snd_card\u0027s -\u003eprivate_free destructor.\n\nHowever, -\u003eprivate_free is only assigned near the end of init_card(),\nafter several failure points (usb_set_interface(), EP type checks,\nusb_submit_urb(), the EP1_CMD_GET_DEVICE_INFO exchange, and its\ntimeout). When any of those fail, init_card() returns an error to\nsnd_probe(), which calls snd_card_free(card). Because -\u003eprivate_free\nis still NULL, card_free() never runs, the usb_get_dev() reference\nis not dropped, and the struct usb_device leaks along with its\ndescriptor allocations and device_private.\n\nsyzbot reproduces this with a malformed UAC3 device whose only valid\naltsetting is 0; init_card()\u0027s usb_set_interface(usb_dev, 0, 1) call\nfails with -EIO and triggers the leak.\n\nMove the -\u003eprivate_free assignment into create_card(), immediately\nafter usb_get_dev(), so that every error path reaching snd_card_free()\nbalances the reference. card_free()\u0027s callees (snd_usb_caiaq_input_free,\nfree_urbs, kfree) already tolerate the partially-initialized state\nbecause the chip private area is zero-initialized by snd_card_new()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:50:34.000Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c874db8a1d2f9f08161470d00cfe8db2f5cca2cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/6fa8dff64fb6c401ced40a05797b327659317498"
        },
        {
          "url": "https://git.kernel.org/stable/c/a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a"
        },
        {
          "url": "https://git.kernel.org/stable/c/50c6a1f05973f56d23280c9d7645a7a5734e0907"
        },
        {
          "url": "https://git.kernel.org/stable/c/da3b8fd6a202d94fef11a443abc9171c52426a1c"
        },
        {
          "url": "https://git.kernel.org/stable/c/6153878c5255bb69b7d0868105ca078ef13cbcf8"
        },
        {
          "url": "https://git.kernel.org/stable/c/21ca595aafa40d3ac70eab1f4cb62cc00ca21657"
        },
        {
          "url": "https://git.kernel.org/stable/c/7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b"
        }
      ],
      "title": "ALSA: caiaq: fix usb_dev refcount leak on probe failure",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46048",
    "datePublished": "2026-05-27T12:57:04.477Z",
    "dateReserved": "2026-05-13T15:03:33.094Z",
    "dateUpdated": "2026-06-14T17:50:34.000Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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