{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-52439",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-52439"
  ],
  "published": "2024-02-20T18:55:31Z",
  "summary": "uio: Fix use-after-free in uio_open",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nuio: Fix use-after-free in uio_open\n\ncore-1\t\t\t\tcore-2\n-------------------------------------------------------\nuio_unregister_device\t\tuio_open\n\t\t\t\tidev = idr_find()\ndevice_unregister(&idev->dev)\nput_device(&idev->dev)\nuio_device_release\n\t\t\t\tget_device(&idev->dev)\nkfree(idev)\nuio_free_minor(minor)\n\t\t\t\tuio_release\n\t\t\t\tput_device(&idev->dev)\n\t\t\t\tkfree(idev)\n-------------------------------------------------------\n\nIn the core-1 uio_unregister_device(), the device_unregister will kfree\nidev when the idev->dev kobject ref is 1. But after core-1\ndevice_unregister, put_device and before doing kfree, the core-2 may\nget_device. Then:\n1. After core-1 kfree idev, the core-2 will do use-after-free for idev.\n2. When core-2 do uio_release and put_device, the idev will be double\n   freed.\n\nTo address this issue, we can get idev atomic & inc idev reference with\nminor_lock.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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        "1:6.1.58-1+rpt2",
        "1:6.1.63-1+rpt1",
        "1:6.1.73-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-52439"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3174e0f7de1ba392dc191625da83df02d695b60c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e93da893d52d82d57fc0db2ca566024e0f26ff50"
    },
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      "url": "https://git.kernel.org/stable/c/5e0be1229ae199ebb90b33102f74a0f22d152570"
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      "url": "https://git.kernel.org/stable/c/5cf604ee538ed0c467abe3b4cda5308a6398f0f7"
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      "url": "https://git.kernel.org/stable/c/17a8519cb359c3b483fb5c7367efa9a8a508bdea"
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      "url": "https://git.kernel.org/stable/c/35f102607054faafe78d2a6994b18d5d9d6e92ad"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:24:39Z"
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}