ghsa-c44q-mxrg-grc2
Vulnerability from github
Published
2025-10-01 12:30
Modified
2025-10-01 12:30
Details

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

gpiolib: cdev: fix NULL-pointer dereferences

There are several places where we can crash the kernel by requesting lines, unbinding the GPIO device, then calling any of the system calls relevant to the GPIO character device's annonymous file descriptors: ioctl(), read(), poll().

While I observed it with the GPIO simulator, it will also happen for any of the GPIO devices that can be hot-unplugged - for instance any HID GPIO expander (e.g. CP2112).

This affects both v1 and v2 uAPI.

This fixes it partially by checking if gdev->chip is not NULL but it doesn't entirely remedy the situation as we still have a race condition in which another thread can remove the device after the check.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50453"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-01T12:15:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpiolib: cdev: fix NULL-pointer dereferences\n\nThere are several places where we can crash the kernel by requesting\nlines, unbinding the GPIO device, then calling any of the system calls\nrelevant to the GPIO character device\u0027s annonymous file descriptors:\nioctl(), read(), poll().\n\nWhile I observed it with the GPIO simulator, it will also happen for any\nof the GPIO devices that can be hot-unplugged - for instance any HID GPIO\nexpander (e.g. CP2112).\n\nThis affects both v1 and v2 uAPI.\n\nThis fixes it partially by checking if gdev-\u003echip is not NULL but it\ndoesn\u0027t entirely remedy the situation as we still have a race condition\nin which another thread can remove the device after the check.",
  "id": "GHSA-c44q-mxrg-grc2",
  "modified": "2025-10-01T12:30:28Z",
  "published": "2025-10-01T12:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50453"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/533aae7c94dbc2b14301cfd68ae7e0e90f0c8438"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d79546622baab843172b52c3af035f83c1b21df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c755a2d6df511eeb5afba966ac28140f9ea5063"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac6ce3cd7a3e10a2e37b8970bab81b4d33d5cfc3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d66f68ac9e7ba46b6b90fbe25155723f2126088a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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