CVE-2025-39723 (GCVE-0-2025-39723)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-08-05 12:04
VLAI
Title
netfs: Fix unbuffered write error handling
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix unbuffered write error handling If all the subrequests in an unbuffered write stream fail, the subrequest collector doesn't update the stream->transferred value and it retains its initial LONG_MAX value. Unfortunately, if all active streams fail, then we take the smallest value of { LONG_MAX, LONG_MAX, ... } as the value to set in wreq->transferred - which is then returned from ->write_iter(). LONG_MAX was chosen as the initial value so that all the streams can be quickly assessed by taking the smallest value of all stream->transferred - but this only works if we've set any of them. Fix this by adding a flag to indicate whether the value in stream->transferred is valid and checking that when we integrate the values. stream->transferred can then be initialised to zero. This was found by running the generic/750 xfstest against cifs with cache=none. It splices data to the target file. Once (if) it has used up all the available scratch space, the writes start failing with ENOSPC. This causes ->write_iter() to fail. However, it was returning wreq->transferred, i.e. LONG_MAX, rather than an error (because it thought the amount transferred was non-zero) and iter_file_splice_write() would then try to clean up that amount of pipe bufferage - leading to an oops when it overran. The kernel log showed: CIFS: VFS: Send error in write = -28 followed by: BUG: kernel NULL pointer dereference, address: 0000000000000008 with: RIP: 0010:iter_file_splice_write+0x3a4/0x520 do_splice+0x197/0x4e0 or: RIP: 0010:pipe_buf_release (include/linux/pipe_fs_i.h:282) iter_file_splice_write (fs/splice.c:755) Also put a warning check into splice to announce if ->write_iter() returned that it had written more than it was asked to.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7034 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < f08c80af3c9a9849cd178b4843b7c01d103506a1 (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < 387164a2b97e1f5404c6d0049a7409bac7d2bc5b (git)
Affected: 288ace2f57c9d06dd2e42bd80d03747d879a4068 , < a3de58b12ce074ec05b8741fa28d62ccb1070468 (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix unbuffered write error handling\n\nIf all the subrequests in an unbuffered write stream fail, the subrequest\ncollector doesn\u0027t update the stream-\u003etransferred value and it retains its\ninitial LONG_MAX value.  Unfortunately, if all active streams fail, then we\ntake the smallest value of { LONG_MAX, LONG_MAX, ... } as the value to set\nin wreq-\u003etransferred - which is then returned from -\u003ewrite_iter().\n\nLONG_MAX was chosen as the initial value so that all the streams can be\nquickly assessed by taking the smallest value of all stream-\u003etransferred -\nbut this only works if we\u0027ve set any of them.\n\nFix this by adding a flag to indicate whether the value in\nstream-\u003etransferred is valid and checking that when we integrate the\nvalues.  stream-\u003etransferred can then be initialised to zero.\n\nThis was found by running the generic/750 xfstest against cifs with\ncache=none.  It splices data to the target file.  Once (if) it has used up\nall the available scratch space, the writes start failing with ENOSPC.\nThis causes -\u003ewrite_iter() to fail.  However, it was returning\nwreq-\u003etransferred, i.e. LONG_MAX, rather than an error (because it thought\nthe amount transferred was non-zero) and iter_file_splice_write() would\nthen try to clean up that amount of pipe bufferage - leading to an oops\nwhen it overran.  The kernel log showed:\n\n    CIFS: VFS: Send error in write = -28\n\nfollowed by:\n\n    BUG: kernel NULL pointer dereference, address: 0000000000000008\n\nwith:\n\n    RIP: 0010:iter_file_splice_write+0x3a4/0x520\n    do_splice+0x197/0x4e0\n\nor:\n\n    RIP: 0010:pipe_buf_release (include/linux/pipe_fs_i.h:282)\n    iter_file_splice_write (fs/splice.c:755)\n\nAlso put a warning check into splice to announce if -\u003ewrite_iter() returned\nthat it had written more than it was asked to."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\nnetfs: Correcci\u00f3n del manejo de errores de escritura sin b\u00fafer\n\nSi todas las subpeticiones en un flujo de escritura sin b\u00fafer fallan, el recolector de subpeticiones no actualiza el valor de stream-\u003etransferred y este retiene su valor inicial LONG_MAX. Desafortunadamente, si todos los flujos activos fallan, entonces tomamos el valor m\u00e1s peque\u00f1o de { LONG_MAX, LONG_MAX, ... } como el valor a establecer en wreq-\u003etransferred, el cual es luego devuelto desde -\u003ewrite_iter().\n\nLONG_MAX fue elegido como el valor inicial para que todos los flujos puedan ser evaluados r\u00e1pidamente tomando el valor m\u00e1s peque\u00f1o de todos los stream-\u003etransferred, pero esto solo funciona si hemos establecido alguno de ellos.\n\nSolucione esto a\u00f1adiendo una bandera para indicar si el valor en stream-\u003etransferred es v\u00e1lido y verificando eso cuando integramos los valores. stream-\u003etransferred puede entonces ser inicializado a cero.\n\nEsto fue encontrado ejecutando el xfstest generic/750 contra cifs con cache=none. Empalma datos al archivo de destino. Una vez (si) ha agotado todo el espacio de trabajo disponible, las escrituras comienzan a fallar con ENOSPC. Esto causa que -\u003ewrite_iter() falle. Sin embargo, estaba devolviendo wreq-\u003etransferred, es decir, LONG_MAX, en lugar de un error (porque pens\u00f3 que la cantidad transferida no era cero) e iter_file_splice_write() intentar\u00eda entonces limpiar esa cantidad de b\u00fafer de tuber\u00eda, lo que llev\u00f3 a un \u0027oops\u0027 cuando se desbord\u00f3. El registro del kernel mostr\u00f3:\n\n    CIFS: VFS: Send error in write = -28\n\nseguido de:\n\n    BUG: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000008\n\ncon:\n\n    RIP: 0010:iter_file_splice_write+0x3a4/0x520\n    do_splice+0x197/0x4e0\n\no:\n\n    RIP: 0010:pipe_buf_release (include/linux/pipe_fs_i.h:282)\n    iter_file_splice_write (fs/splice.c:755)\n\nTambi\u00e9n se a\u00f1adi\u00f3 una verificaci\u00f3n de advertencia en splice para anunciar si -\u003ewrite_iter() devolvi\u00f3 que hab\u00eda escrito m\u00e1s de lo que se le pidi\u00f3."
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        "id": "CVE-2025-39723",
        "lastModified": "2026-10-19T21:10:00.160",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfs: Fix unbuffered write error handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39723.json",
      "version": "3"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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

Author Source Type Date Other

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.