ghsa-33pj-gwj2-3g99
Vulnerability from github
Published
2025-08-22 18:31
Modified
2025-08-22 18:31
Details

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

can: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode

Andrei Lalaev reported a NULL pointer deref when a CAN device is restarted from Bus Off and the driver does not implement the struct can_priv::do_set_mode callback.

There are 2 code path that call struct can_priv::do_set_mode: - directly by a manual restart from the user space, via can_changelink() - delayed automatic restart after bus off (deactivated by default)

To prevent the NULL pointer deference, refuse a manual restart or configure the automatic restart delay in can_changelink() and report the error via extack to user space.

As an additional safety measure let can_restart() return an error if can_priv::do_set_mode is not set instead of dereferencing it unchecked.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38665"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-22T16:15:41Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode\n\nAndrei Lalaev reported a NULL pointer deref when a CAN device is\nrestarted from Bus Off and the driver does not implement the struct\ncan_priv::do_set_mode callback.\n\nThere are 2 code path that call struct can_priv::do_set_mode:\n- directly by a manual restart from the user space, via\n  can_changelink()\n- delayed automatic restart after bus off (deactivated by default)\n\nTo prevent the NULL pointer deference, refuse a manual restart or\nconfigure the automatic restart delay in can_changelink() and report\nthe error via extack to user space.\n\nAs an additional safety measure let can_restart() return an error if\ncan_priv::do_set_mode is not set instead of dereferencing it\nunchecked.",
  "id": "GHSA-33pj-gwj2-3g99",
  "modified": "2025-08-22T18:31:23Z",
  "published": "2025-08-22T18:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38665"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6acceb46180f9e160d4f0c56fcaf39ba562822ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bbcf37c5114926c99a1d1e6993a5b35689d2599"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1f3f9797c1f44a762e6f5f72520b2e520537b52"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf81a60a973358dea163f6b14062f17831ceb894"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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