GHSA-36X9-553R-V339

Vulnerability from github – Published: 2025-08-19 18:31 – Updated: 2025-11-26 21:31
VLAI?
Details

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

nfsd: avoid ref leak in nfsd_open_local_fh()

If two calls to nfsd_open_local_fh() race and both successfully call nfsd_file_acquire_local(), they will both get an extra reference to the net to accompany the file reference stored in *pnf.

One of them will fail to store (using xchg()) the file reference in *pnf and will drop that reference but WON'T drop the accompanying reference to the net. This leak means that when the nfs server is shut down it will hang in nfsd_shutdown_net() waiting for &nn->nfsd_net_free_done.

This patch adds the missing nfsd_net_put().

Severity ?
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38567"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-19T17:15:33Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: avoid ref leak in nfsd_open_local_fh()\n\nIf two calls to nfsd_open_local_fh() race and both successfully call\nnfsd_file_acquire_local(), they will both get an extra reference to the\nnet to accompany the file reference stored in *pnf.\n\nOne of them will fail to store (using xchg()) the file reference in\n*pnf and will drop that reference but WON\u0027T drop the accompanying\nreference to the net.  This leak means that when the nfs server is shut\ndown it will hang in nfsd_shutdown_net() waiting for\n\u0026nn-\u003enfsd_net_free_done.\n\nThis patch adds the missing nfsd_net_put().",
  "id": "GHSA-36x9-553r-v339",
  "modified": "2025-11-26T21:31:25Z",
  "published": "2025-08-19T18:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38567"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4bf8f26c51e51bbb840935659a7b3b65a802c07"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5a73150776f18547ee685c9f6bfafe549714899"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fcb0a417fddb605530c4837e0996620f8ed38023"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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