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CVE-2024-57942

Estado: AnalizadaMedia (5.5)—

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

netfs: Fix ceph copy to cache on write-begin

At the end of netfs_unlock_read_folio() in which folios are marked appropriately for copying to the cache (either with by being marked dirty and having their private data set or by having PG_private_2 set) and then unlocked, the folio_queue struct has the entry pointing to the folio cleared. This presents a problem for netfs_pgpriv2_write_to_the_cache(), which is used to write folios marked with PG_private_2 to the cache as it expects to be able to trawl the folio_queue list thereafter to find the relevant folios, leading to a hang.

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Fix this by not clearing the folio_queue entry if we're going to do the deprecated copy-to-cache. The clearance will be done instead as the folios are written to the cache.

This can be reproduced by starting cachefiles, mounting a ceph filesystem with "-o fsc" and writing to it.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix ceph copy to cache on write-begin\n\nAt the end of netfs_unlock_read_folio() in which folios are marked\nappropriately for copying to the cache (either with by being marked dirty\nand having their private data set or by having PG_private_2 set) and then\nunlocked, the folio_queue struct has the entry pointing to the folio\ncleared.  This presents a problem for netfs_pgpriv2_write_to_the_cache(),\nwhich is used to write folios marked with PG_private_2 to the cache as it\nexpects to be able to trawl the folio_queue list thereafter to find the\nrelevant folios, leading to a hang.\n\nFix this by not clearing the folio_queue entry if we're going to do the\ndeprecated copy-to-cache.  The clearance will be done instead as the folios\nare written to the cache.\n\nThis can be reproduced by starting cachefiles, mounting a ceph filesystem\nwith \"-o fsc\" and writing to it."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfs: Fix ceph copy to cache on write-begin Al final de netfs_unlock_read_folio() en el que los folios se marcan adecuadamente para copiarlos al caché (ya sea marcándolos como sucios y teniendo sus datos privados configurados o teniendo PG_private_2 configurado) y luego se desbloquean, la estructura folio_queue tiene la entrada que apunta al folio borrada. Esto presenta un problema para netfs_pgpriv2_write_to_the_cache(), que se usa para escribir folios marcados con PG_private_2 en el caché, ya que espera poder rastrear la lista folio_queue a partir de entonces para encontrar los folios relevantes, lo que lleva a un bloqueo. Solucione esto al no borrar la entrada folio_queue si vamos a hacer la copia al caché obsoleta. La limpieza se realizará en su lugar a medida que los folios se escriben en el caché. Esto se puede reproducir iniciando cachefiles, montando un sistema de archivos ceph con \"-o fsc\" y escribiendo en él."
    }
  ],
  "lastModified": "2026-06-17T08:14:16.993",
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