CVE-2026-89901 (GCVE-0-2026-89901)
Vulnerability from cvelistv5
Published
2026-09-16 10:32
Modified
2026-10-19 08:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref airspy_disconnect() clears s->udev under v4l2_lock, but airspy_stop_streaming() unconditionally calls airspy_ctrl_msg() and airspy_free_stream_bufs() afterwards. If a streaming user closes the device after disconnect, stop_streaming() runs and dereferences the NULL s->udev: airspy_stop_streaming() airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0) usb_sndctrlpipe(s->udev, 0) /* NULL deref */ airspy_free_stream_bufs(s) usb_free_coherent(s->udev, ...) /* NULL deref */ The airspy driver uses vb2_fop_release() in its file_operations, so replace video_unregister_device(&s->vdev) with vb2_video_unregister_device(&s->vdev) and move it before clearing s->udev. vb2_video_unregister_device() releases the vb2 queue, which synchronously runs airspy_stop_streaming() if streaming is active, so the URBs, coherent DMA stream buffers and the hardware stop control message all execute while s->udev is still valid. vb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock) internally, and stop_streaming() locks v4l2_lock, so the previous outer mutex_lock(&s->vb_queue_lock) / mutex_lock(&s->v4l2_lock) pair around the unregister sequence would self-deadlock and has been removed. A short v4l2_lock critical section around s->udev = NULL remains so any ioctl path that still holds the file descriptor sees coherent state. Issue identified by automated review of the INV-003 series at https://sashiko.dev/
References
Impacted products
Vendor Product Version
Linux Linux Version: 634fe5033951b80ef4b98d8f047cb1083d29170d
Version: 634fe5033951b80ef4b98d8f047cb1083d29170d
Version: 634fe5033951b80ef4b98d8f047cb1083d29170d
Version: 634fe5033951b80ef4b98d8f047cb1083d29170d
Version: 634fe5033951b80ef4b98d8f047cb1083d29170d
Version: 634fe5033951b80ef4b98d8f047cb1083d29170d
Version: 634fe5033951b80ef4b98d8f047cb1083d29170d
Version: 634fe5033951b80ef4b98d8f047cb1083d29170d
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/usb/airspy/airspy.c"
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref\n\nairspy_disconnect() clears s-\u003eudev under v4l2_lock, but\nairspy_stop_streaming() unconditionally calls airspy_ctrl_msg() and\nairspy_free_stream_bufs() afterwards. If a streaming user closes the\ndevice after disconnect, stop_streaming() runs and dereferences the\nNULL s-\u003eudev:\n\n  airspy_stop_streaming()\n    airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0)\n      usb_sndctrlpipe(s-\u003eudev, 0)         /* NULL deref */\n    airspy_free_stream_bufs(s)\n      usb_free_coherent(s-\u003eudev, ...)     /* NULL deref */\n\nThe airspy driver uses vb2_fop_release() in its file_operations, so\nreplace video_unregister_device(\u0026s-\u003evdev) with\nvb2_video_unregister_device(\u0026s-\u003evdev) and move it before clearing\ns-\u003eudev. vb2_video_unregister_device() releases the vb2 queue, which\nsynchronously runs airspy_stop_streaming() if streaming is active, so\nthe URBs, coherent DMA stream buffers and the hardware stop control\nmessage all execute while s-\u003eudev is still valid.\n\nvb2_video_unregister_device() locks vdev-\u003equeue-\u003elock (vb_queue_lock)\ninternally, and stop_streaming() locks v4l2_lock, so the previous outer\nmutex_lock(\u0026s-\u003evb_queue_lock) / mutex_lock(\u0026s-\u003ev4l2_lock) pair around\nthe unregister sequence would self-deadlock and has been removed. A\nshort v4l2_lock critical section around s-\u003eudev = NULL remains so any\nioctl path that still holds the file descriptor sees coherent state.\n\nIssue identified by automated review of the INV-003 series at\nhttps://sashiko.dev/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:54:34.110Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c9081e2655188d2d134a741aec837dc70439d505"
        },
        {
          "url": "https://git.kernel.org/stable/c/75089cea32e5055773bd13116236d08fdc98678a"
        },
        {
          "url": "https://git.kernel.org/stable/c/155d0378ae0d6305cc4840583a6b42d2d0595bff"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e4ea90fdc6608cd5fac342e146ab6ae15d430bc"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9a8c37ddda9fa3687b142be9098e1c37b8faf35"
        },
        {
          "url": "https://git.kernel.org/stable/c/297fee023f46d771a844520675692ea089d80d9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c6749ac8f59cc80eb1b2d52f167fdf13e12655cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f378dc45e685fc825d2dd08e7864666d6fcc009"
        }
      ],
      "title": "media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89901",
    "datePublished": "2026-09-16T10:32:00.997Z",
    "dateReserved": "2026-09-11T19:38:34.774Z",
    "dateUpdated": "2026-10-19T08:54:34.110Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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