GHSA-GVP5-MG7R-W29G

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:34
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

ALSA: caiaq: unregister the input device when probe fails

setup_card() registers the input device, whose name and phys point into struct snd_usb_caiaqdev, and then goes on to snd_card_register() and snd_usb_caiaq_control_init(). If either fails, snd_probe() calls snd_card_free(), which frees the device state but leaves the input device registered: card_free() only clears the pointer, and the input device is unregistered from snd_disconnect() alone. Reading its "uevent" attribute afterwards dereferences freed memory:

BUG: KASAN: slab-use-after-free in string+0x4a9/0x4f0 Read of size 1 at addr ffff8880208f5043 by task caiaq/4967 add_uevent_var+0x183/0x3a0 input_dev_uevent+0x162/0x900 dev_uevent+0x2f1/0x870 uevent_show+0x1ca/0x3a0 ...

Unregister the input device on the probe error path, as snd_disconnect() does. snd_usb_caiaq_input_disconnect() is a no-op when no input device was registered.

Reproduced with a raw-gadget Audio Kontrol 1 and a temporary hack that makes snd_usb_caiaq_control_init() fail.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98837"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:37Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: unregister the input device when probe fails\n\nsetup_card() registers the input device, whose name and phys point into\nstruct snd_usb_caiaqdev, and then goes on to snd_card_register() and\nsnd_usb_caiaq_control_init(). If either fails, snd_probe() calls\nsnd_card_free(), which frees the device state but leaves the input\ndevice registered: card_free() only clears the pointer, and the input\ndevice is unregistered from snd_disconnect() alone. Reading its \"uevent\"\nattribute afterwards dereferences freed memory:\n\n  BUG: KASAN: slab-use-after-free in string+0x4a9/0x4f0\n  Read of size 1 at addr ffff8880208f5043 by task caiaq/4967\n   add_uevent_var+0x183/0x3a0\n   input_dev_uevent+0x162/0x900\n   dev_uevent+0x2f1/0x870\n   uevent_show+0x1ca/0x3a0\n   ...\n\nUnregister the input device on the probe error path, as\nsnd_disconnect() does. snd_usb_caiaq_input_disconnect() is a no-op when\nno input device was registered.\n\nReproduced with a raw-gadget Audio Kontrol 1 and a temporary hack that\nmakes snd_usb_caiaq_control_init() fail.",
  "id": "GHSA-gvp5-mg7r-w29g",
  "modified": "2026-10-30T15:34:04Z",
  "published": "2026-10-18T18:32:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98837"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0b7bd20f6379bc5e431fd74d866390f5b5b63f3c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d5d194594ff616ad36a052bde739d1cf5855b95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e5a413cc2a489c9427ecd3d73ad764bfb0c7103"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7017c9dda1ebbab428a6fd29c841596b5c9c84d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8315ea07ebb2497531ff42dd640396f6f1d4a8f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84727facd8506140cd04f2b0a8b1c4ddeac41cea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/850810c12686f80cdf7530f4f21e0157d904f739"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df2787819bd137111b56b8631dd581b0cce7144d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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