Vulnerability-Lookup

FKIE_CVE-2025-71090

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-03-25 18:12

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix nfsd_file reference leak in nfsd4_add_rdaccess_to_wrdeleg() nfsd4_add_rdaccess_to_wrdeleg() unconditionally overwrites fp->fi_fds[O_RDONLY] with a newly acquired nfsd_file. However, if the client already has a SHARE_ACCESS_READ open from a previous OPEN operation, this action overwrites the existing pointer without releasing its reference, orphaning the previous reference. Additionally, the function originally stored the same nfsd_file pointer in both fp->fi_fds[O_RDONLY] and fp->fi_rdeleg_file with only a single reference. When put_deleg_file() runs, it clears fi_rdeleg_file and calls nfs4_file_put_access() to release the file. However, nfs4_file_put_access() only releases fi_fds[O_RDONLY] when the fi_access[O_RDONLY] counter drops to zero. If another READ open exists on the file, the counter remains elevated and the nfsd_file reference from the delegation is never released. This potentially causes open conflicts on that file. Then, on server shutdown, these leaks cause __nfsd_file_cache_purge() to encounter files with an elevated reference count that cannot be cleaned up, ultimately triggering a BUG() in kmem_cache_destroy() because there are still nfsd_file objects allocated in that cache.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8072e34e1387d03102b788677d491e2bcceef6f5	Patch
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c07dc84ed67c5a182273171639bacbbb87c12175	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	6.17
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19

JSON

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix nfsd_file reference leak in nfsd4_add_rdaccess_to_wrdeleg()\n\nnfsd4_add_rdaccess_to_wrdeleg() unconditionally overwrites\nfp-\u003efi_fds[O_RDONLY] with a newly acquired nfsd_file. However, if\nthe client already has a SHARE_ACCESS_READ open from a previous OPEN\noperation, this action overwrites the existing pointer without\nreleasing its reference, orphaning the previous reference.\n\nAdditionally, the function originally stored the same nfsd_file\npointer in both fp-\u003efi_fds[O_RDONLY] and fp-\u003efi_rdeleg_file with\nonly a single reference. When put_deleg_file() runs, it clears\nfi_rdeleg_file and calls nfs4_file_put_access() to release the file.\n\nHowever, nfs4_file_put_access() only releases fi_fds[O_RDONLY] when\nthe fi_access[O_RDONLY] counter drops to zero. If another READ open\nexists on the file, the counter remains elevated and the nfsd_file\nreference from the delegation is never released. This potentially\ncauses open conflicts on that file.\n\nThen, on server shutdown, these leaks cause __nfsd_file_cache_purge()\nto encounter files with an elevated reference count that cannot be\ncleaned up, ultimately triggering a BUG() in kmem_cache_destroy()\nbecause there are still nfsd_file objects allocated in that cache."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnfsd: corregir fuga de referencia de nfsd_file en nfsd4_add_rdaccess_to_wrdeleg()\n\nnfsd4_add_rdaccess_to_wrdeleg() sobrescribe incondicionalmente fp-\u0026gt;fi_fds[O_RDONLY] con un nfsd_file reci\u00e9n adquirido. Sin embargo, si el cliente ya tiene una apertura SHARE_ACCESS_READ de una operaci\u00f3n OPEN anterior, esta acci\u00f3n sobrescribe el puntero existente sin liberar su referencia, dejando hu\u00e9rfana la referencia anterior.\n\nAdem\u00e1s, la funci\u00f3n originalmente almacenaba el mismo puntero nfsd_file tanto en fp-\u0026gt;fi_fds[O_RDONLY] como en fp-\u0026gt;fi_rdeleg_file con una sola referencia. Cuando se ejecuta put_deleg_file(), borra fi_rdeleg_file y llama a nfs4_file_put_access() para liberar el archivo.\n\nSin embargo, nfs4_file_put_access() solo libera fi_fds[O_RDONLY] cuando el contador fi_access[O_RDONLY] cae a cero. Si existe otra apertura READ en el archivo, el contador permanece elevado y la referencia nfsd_file de la delegaci\u00f3n nunca se libera. Esto potencialmente causa conflictos de apertura en ese archivo.\n\nLuego, al apagar el servidor, estas fugas hacen que __nfsd_file_cache_purge() encuentre archivos con un recuento de referencias elevado que no pueden ser limpiados, lo que finalmente dispara un BUG() en kmem_cache_destroy() porque todav\u00eda hay objetos nfsd_file asignados en esa cach\u00e9."
    }
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  "id": "CVE-2025-71090",
  "lastModified": "2026-03-25T18:12:03.850",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
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CVE-2025-71090 (GCVE-0-2025-71090)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:34 – Updated: 2026-02-09 08:34

Title

nfsd: fix nfsd_file reference leak in nfsd4_add_rdaccess_to_wrdeleg()

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/c07dc84ed67c5a182…
	https://git.kernel.org/stable/c/8072e34e1387d0310…

Impacted products

Vendor

Product

Version

Linux

Affected: e7a8ebc305f26cab608e59a916a4ae89d6656c5f , < c07dc84ed67c5a182273171639bacbbb87c12175 (git)
Affected: e7a8ebc305f26cab608e59a916a4ae89d6656c5f , < 8072e34e1387d03102b788677d491e2bcceef6f5 (git)

Linux

Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.4 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "programFiles": [
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Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2025-71090

CVE-2025-71090 (GCVE-0-2025-71090)

Tags

Sightings

Nomenclature