FKIE_CVE-2025-38567

Vulnerability from fkie_nvd - Published: 2025-08-19 17:15 - Updated: 2025-11-26 20:05
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c4bf8f26c51e51bbb840935659a7b3b65a802c07Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5a73150776f18547ee685c9f6bfafe549714899Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcb0a417fddb605530c4837e0996620f8ed38023Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.16
linux linux_kernel 6.17
To clipboard 

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  "configurations": [
    {
      "nodes": [
        {
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "6.15.10",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: evitar fuga de referencia en nfsd_open_local_fh(). Si se ejecutan dos llamadas a nfsd_open_local_fh() y ambas invocan correctamente nfsd_file_acquire_local(), ambas obtendr\u00e1n una referencia adicional a la red que acompa\u00f1a a la referencia del archivo almacenada en *pnf. Una de ellas no almacenar\u00e1 (mediante xchg()) la referencia del archivo en *pnf y la eliminar\u00e1, pero NO eliminar\u00e1 la referencia que la acompa\u00f1a a la red. Esta fuga significa que, al apagar el servidor NFS, se bloquear\u00e1 en nfsd_shutdown_net() esperando \u0026amp;nn-\u0026gt;nfsd_net_free_done. Este parche a\u00f1ade la funci\u00f3n nfsd_net_put() que faltaba."
    }
  ],
  "id": "CVE-2025-38567",
  "lastModified": "2025-11-26T20:05:59.707",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-08-19T17:15:33.380",
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      "tags": [
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  "vulnStatus": "Analyzed",
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          "lang": "en",
          "value": "CWE-362"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
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}


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