ghsa-hxvp-53j6-m4qh
Vulnerability from github
Published
2024-06-19 15:30
Modified
2024-06-19 15:30
Details

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

epoll: be better about file lifetimes

epoll can call out to vfs_poll() with a file pointer that may race with the last 'fput()'. That would make f_count go down to zero, and while the ep->mtx locking means that the resulting file pointer tear-down will be blocked until the poll returns, it means that f_count is already dead, and any use of it won't actually get a reference to the file any more: it's dead regardless.

Make sure we have a valid ref on the file pointer before we call down to vfs_poll() from the epoll routines.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-38580"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-19T14:15:18Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nepoll: be better about file lifetimes\n\nepoll can call out to vfs_poll() with a file pointer that may race with\nthe last \u0027fput()\u0027. That would make f_count go down to zero, and while\nthe ep-\u003emtx locking means that the resulting file pointer tear-down will\nbe blocked until the poll returns, it means that f_count is already\ndead, and any use of it won\u0027t actually get a reference to the file any\nmore: it\u0027s dead regardless.\n\nMake sure we have a valid ref on the file pointer before we call down to\nvfs_poll() from the epoll routines.",
  "id": "GHSA-hxvp-53j6-m4qh",
  "modified": "2024-06-19T15:30:53Z",
  "published": "2024-06-19T15:30:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-38580"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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