ghsa-f9wm-ppg2-pc92
Vulnerability from github
Published
2025-10-01 09:30
Modified
2025-10-01 09:30
Details

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

genetlink: fix genl_bind() invoking bind() after -EPERM

Per family bind/unbind callbacks were introduced to allow families to track multicast group consumer presence, e.g. to start or stop producing events depending on listeners.

However, in genl_bind() the bind() callback was invoked even if capability checks failed and ret was set to -EPERM. This means that callbacks could run on behalf of unauthorized callers while the syscall still returned failure to user space.

Fix this by only invoking bind() after "if (ret) break;" check i.e. after permission checks have succeeded.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39926"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-01T08:15:35Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngenetlink: fix genl_bind() invoking bind() after -EPERM\n\nPer family bind/unbind callbacks were introduced to allow families\nto track multicast group consumer presence, e.g. to start or stop\nproducing events depending on listeners.\n\nHowever, in genl_bind() the bind() callback was invoked even if\ncapability checks failed and ret was set to -EPERM. This means that\ncallbacks could run on behalf of unauthorized callers while the\nsyscall still returned failure to user space.\n\nFix this by only invoking bind() after \"if (ret) break;\" check\ni.e. after permission checks have succeeded.",
  "id": "GHSA-f9wm-ppg2-pc92",
  "modified": "2025-10-01T09:30:25Z",
  "published": "2025-10-01T09:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39926"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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