ghsa-g57h-pwpg-2849
Vulnerability from github
Published
2025-12-16 18:31
Modified
2025-12-16 18:31
Details

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

usbnet: Prevents free active kevent

The root cause of this issue are: 1. When probing the usbnet device, executing usbnet_link_change(dev, 0, 0); put the kevent work in global workqueue. However, the kevent has not yet been scheduled when the usbnet device is unregistered. Therefore, executing free_netdev() results in the "free active object (kevent)" error reported here.

  1. Another factor is that when calling usbnet_disconnect()->unregister_netdev(), if the usbnet device is up, ndo_stop() is executed to cancel the kevent. However, because the device is not up, ndo_stop() is not executed.

The solution to this problem is to cancel the kevent before executing free_netdev().

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68312"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-16T16:16:10Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbnet: Prevents free active kevent\n\nThe root cause of this issue are:\n1. When probing the usbnet device, executing usbnet_link_change(dev, 0, 0);\nput the kevent work in global workqueue. However, the kevent has not yet\nbeen scheduled when the usbnet device is unregistered. Therefore, executing\nfree_netdev() results in the \"free active object (kevent)\" error reported\nhere.\n\n2. Another factor is that when calling usbnet_disconnect()-\u003eunregister_netdev(),\nif the usbnet device is up, ndo_stop() is executed to cancel the kevent.\nHowever, because the device is not up, ndo_stop() is not executed.\n\nThe solution to this problem is to cancel the kevent before executing\nfree_netdev().",
  "id": "GHSA-g57h-pwpg-2849",
  "modified": "2025-12-16T18:31:34Z",
  "published": "2025-12-16T18:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68312"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/285d4b953f2ca03c358f986718dd89ee9bde632e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ce1de32e05445d77fc056f6ff8339cfb78a5f84"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a10619fdefd3051aeb14860e4d4335529b4e94d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/420c84c330d1688b8c764479e5738bbdbf0a33de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43005002b60ef3424719ecda16d124714b45da3b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5158fb8da162e3982940f30cd01ed77bdf42c6fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88a38b135d69f5db9024ff6527232f1b51be8915"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a579d6a39513069d298eee70770bbac8a148565"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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