CVE-2026-98837 (GCVE-0-2026-98837)
Vulnerability from cvelistv5
Published
2026-10-18 15:50
Modified
2026-10-30 12:40
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: da938aa9fc7826901921dcea225948ab21a97e45
Version: 09616e25f502080ba684fc7fcf959d1376ab756d
Version: b956e48371f2ff72b76be9a829800ecec963bd45
Version: f537e3ad69609f6924a4db6b4a7f6561f5288bdd
Version: 6251e3e256337a30160ef59ab1580dde4d1acd28
Version: e59ecd4ee3a450db6cb4e4ecaa3efdd593f80056
Version: 28abd224db4a49560b452115bca3672a20e45b2f
Version: 28abd224db4a49560b452115bca3672a20e45b2f
Version: 096dd8519cf2f768e9e14f224b627f7aaee1a9c5
Version: 5.10.258   ≤
Version: 5.15.209   ≤
Version: 6.1.175   ≤
Version: 6.6.140   ≤
Version: 6.12.86   ≤
Version: 6.18.27   ≤
Version: 7.0.4   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:40:06.606Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7017c9dda1ebbab428a6fd29c841596b5c9c84d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/8315ea07ebb2497531ff42dd640396f6f1d4a8f0"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d5d194594ff616ad36a052bde739d1cf5855b95"
        },
        {
          "url": "https://git.kernel.org/stable/c/df2787819bd137111b56b8631dd581b0cce7144d"
        },
        {
          "url": "https://git.kernel.org/stable/c/850810c12686f80cdf7530f4f21e0157d904f739"
        },
        {
          "url": "https://git.kernel.org/stable/c/84727facd8506140cd04f2b0a8b1c4ddeac41cea"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e5a413cc2a489c9427ecd3d73ad764bfb0c7103"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b7bd20f6379bc5e431fd74d866390f5b5b63f3c"
        }
      ],
      "title": "ALSA: caiaq: unregister the input device when probe fails",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98837",
    "datePublished": "2026-10-18T15:50:05.338Z",
    "dateReserved": "2026-09-25T10:25:14.372Z",
    "dateUpdated": "2026-10-30T12:40:06.606Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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