CVE-2024-42104 (GCVE-0-2024-42104)

Vulnerability from cvelistv5 – Published: 2024-07-30 07:46 – Updated: 2026-05-11 20:27
VLAI?
Title
nilfs2: add missing check for inode numbers on directory entries
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < c33c2b0d92aa1c2262d999b2598ad6fbd53bd479 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 07c176e7acc5579c133bb923ab21316d192d0a95 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 2f2fa9cf7c3537958a82fbe8c8595a5eb0861ad7 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < b11e8fb93ea5eefb2e4e719497ea177a58ff6131 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 1b7d549ed2c1fa202c751b69423a0d3a6bd5a180 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 3ab40870edb883b9633dc5cd55f5a2a11afa618d (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 265fff1a01cdc083aeaf0d934c929db5cc64aebf (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < bb76c6c274683c8570ad788f79d4b875bde0e458 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 4.19.318 , ≤ 4.19.* (semver)
Unaffected: 5.4.280 , ≤ 5.4.* (semver)
Unaffected: 5.10.222 , ≤ 5.10.* (semver)
Unaffected: 5.15.163 , ≤ 5.15.* (semver)
Unaffected: 6.1.98 , ≤ 6.1.* (semver)
Unaffected: 6.6.39 , ≤ 6.6.* (semver)
Unaffected: 6.9.9 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
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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 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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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

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.



Detection rules are retrieved from Rulezet.