{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89901",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-89901"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref",
  "details": "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->udev 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->udev:\n\n  airspy_stop_streaming()\n    airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0)\n      usb_sndctrlpipe(s->udev, 0)         /* NULL deref */\n    airspy_free_stream_bufs(s)\n      usb_free_coherent(s->udev, ...)     /* NULL deref */\n\nThe airspy driver uses vb2_fop_release() in its file_operations, so\nreplace video_unregister_device(&s->vdev) with\nvb2_video_unregister_device(&s->vdev) and move it before clearing\ns->udev. 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->udev is still valid.\n\nvb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock)\ninternally, and stop_streaming() locks v4l2_lock, so the previous outer\nmutex_lock(&s->vb_queue_lock) / mutex_lock(&s->v4l2_lock) pair around\nthe unregister sequence would self-deadlock and has been removed. A\nshort v4l2_lock critical section around s->udev = 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/",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.188",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89901"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c9081e2655188d2d134a741aec837dc70439d505"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/75089cea32e5055773bd13116236d08fdc98678a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/155d0378ae0d6305cc4840583a6b42d2d0595bff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6e4ea90fdc6608cd5fac342e146ab6ae15d430bc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a9a8c37ddda9fa3687b142be9098e1c37b8faf35"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/297fee023f46d771a844520675692ea089d80d9d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6749ac8f59cc80eb1b2d52f167fdf13e12655cc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2f378dc45e685fc825d2dd08e7864666d6fcc009"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T10:32:03Z"
  }
}