FKIE_CVE-2024-42104

Vulnerability from fkie_nvd - Published: 2024-07-30 08:15 - Updated: 2025-11-03 22:17
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: add missing check for inode numbers on directory entries Syzbot reported that mounting and unmounting a specific pattern of corrupted nilfs2 filesystem images causes a use-after-free of metadata file inodes, which triggers a kernel bug in lru_add_fn(). As Jan Kara pointed out, this is because the link count of a metadata file gets corrupted to 0, and nilfs_evict_inode(), which is called from iput(), tries to delete that inode (ifile inode in this case). The inconsistency occurs because directories containing the inode numbers of these metadata files that should not be visible in the namespace are read without checking. Fix this issue by treating the inode numbers of these internal files as errors in the sanity check helper when reading directory folios/pages. Also thanks to Hillf Danton and Matthew Wilcox for their initial mm-layer analysis.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07c176e7acc5579c133bb923ab21316d192d0a95Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1b7d549ed2c1fa202c751b69423a0d3a6bd5a180Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/265fff1a01cdc083aeaf0d934c929db5cc64aebfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ab40870edb883b9633dc5cd55f5a2a11afa618dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b11e8fb93ea5eefb2e4e719497ea177a58ff6131Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bb76c6c274683c8570ad788f79d4b875bde0e458Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c33c2b0d92aa1c2262d999b2598ad6fbd53bd479Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/07c176e7acc5579c133bb923ab21316d192d0a95Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1b7d549ed2c1fa202c751b69423a0d3a6bd5a180Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/265fff1a01cdc083aeaf0d934c929db5cc64aebfPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3ab40870edb883b9633dc5cd55f5a2a11afa618dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b11e8fb93ea5eefb2e4e719497ea177a58ff6131Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bb76c6c274683c8570ad788f79d4b875bde0e458Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c33c2b0d92aa1c2262d999b2598ad6fbd53bd479Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: add missing check for inode numbers on directory entries\n\nSyzbot reported that mounting and unmounting a specific pattern of\ncorrupted nilfs2 filesystem images causes a use-after-free of metadata\nfile inodes, which triggers a kernel bug in lru_add_fn().\n\nAs Jan Kara pointed out, this is because the link count of a metadata file\ngets corrupted to 0, and nilfs_evict_inode(), which is called from iput(),\ntries to delete that inode (ifile inode in this case).\n\nThe inconsistency occurs because directories containing the inode numbers\nof these metadata files that should not be visible in the namespace are\nread without checking.\n\nFix this issue by treating the inode numbers of these internal files as\nerrors in the sanity check helper when reading directory folios/pages.\n\nAlso thanks to Hillf Danton and Matthew Wilcox for their initial mm-layer\nanalysis."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: nilfs2: agrega una verificaci\u00f3n faltante para los n\u00fameros de inodo en las entradas del directorio Syzbot inform\u00f3 que montar y desmontar un patr\u00f3n espec\u00edfico de im\u00e1genes corruptas del sistema de archivos nilfs2 provoca un use after free de los inodos del archivo de metadatos, lo que desencadena un error del kernel en lru_add_fn(). Como se\u00f1al\u00f3 Jan Kara, esto se debe a que el recuento de enlaces de un archivo de metadatos se corrompe a 0, y nilfs_evict_inode(), que se llama desde iput(), intenta eliminar ese inodo (inodo ifile en este caso). La inconsistencia se produce porque los directorios que contienen los n\u00fameros de inodo de estos archivos de metadatos que no deber\u00edan ser visibles en el espacio de nombres se leen sin verificar. Solucione este problema tratando los n\u00fameros de inodo de estos archivos internos como errores en el asistente de verificaci\u00f3n de cordura al leer folios/p\u00e1ginas del directorio. Tambi\u00e9n gracias a Hillf Danton y Matthew Wilcox por su an\u00e1lisis inicial de capas mm."
    }
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  "id": "CVE-2024-42104",
  "lastModified": "2025-11-03T22:17:38.740",
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          "attackVector": "LOCAL",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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  • 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.
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  • 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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