ghsa-wh68-8742-rwwq
Vulnerability from github
Published
2025-12-08 03:31
Modified
2025-12-08 03:31
Details

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

drm/mediatek: Fix device use-after-free on unbind

A recent change fixed device reference leaks when looking up drm platform device driver data during bind() but failed to remove a partial fix which had been added by commit 80805b62ea5b ("drm/mediatek: Fix kobject put for component sub-drivers").

This results in a reference imbalance on component bind() failures and on unbind() which could lead to a user-after-free.

Make sure to only drop the references after retrieving the driver data by effectively reverting the previous partial fix.

Note that holding a reference to a device does not prevent its driver data from going away so there is no point in keeping the reference.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40316"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-08T01:16:04Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/mediatek: Fix device use-after-free on unbind\n\nA recent change fixed device reference leaks when looking up drm\nplatform device driver data during bind() but failed to remove a partial\nfix which had been added by commit 80805b62ea5b (\"drm/mediatek: Fix\nkobject put for component sub-drivers\").\n\nThis results in a reference imbalance on component bind() failures and\non unbind() which could lead to a user-after-free.\n\nMake sure to only drop the references after retrieving the driver data\nby effectively reverting the previous partial fix.\n\nNote that holding a reference to a device does not prevent its driver\ndata from going away so there is no point in keeping the reference.",
  "id": "GHSA-wh68-8742-rwwq",
  "modified": "2025-12-08T03:31:01Z",
  "published": "2025-12-08T03:31:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40316"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0142fe895986addf35885b43440718e567121155"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ba827e09eb586e952d10e39406fa02d10bb591e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/926d002e6d7e2f1fd5c1b53cf6208153ee7d380d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5a896f8315de358a2932e2c23c42d550256046a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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