CVE-2025-38567 (GCVE-0-2025-38567)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:02 – Updated: 2026-05-23 16:00
VLAI
Title
nfsd: avoid ref leak in nfsd_open_local_fh()
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().
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 986a21ace186433e0397a59491646edad8c8d636 , < fcb0a417fddb605530c4837e0996620f8ed38023 (git)
Affected: e6f7e1487ab528a6c653bd0d42812ff2942846cd , < c4bf8f26c51e51bbb840935659a7b3b65a802c07 (git)
Affected: e6f7e1487ab528a6c653bd0d42812ff2942846cd , < e5a73150776f18547ee685c9f6bfafe549714899 (git)
Affected: 6.15.3 , < 6.15.10 (semver)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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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. 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    "redhat_vex": {
      "aggregate_severity": "None",
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      "title": "kernel: nfsd: avoid ref leak in nfsd_open_local_fh()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38567.json",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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