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CVE-2021-47482 (GCVE-0-2021-47482)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-05-11 13:55
VLAI
Title
net: batman-adv: fix error handling
Summary
In the Linux kernel, the following vulnerability has been resolved: net: batman-adv: fix error handling Syzbot reported ODEBUG warning in batadv_nc_mesh_free(). The problem was in wrong error handling in batadv_mesh_init(). Before this patch batadv_mesh_init() was calling batadv_mesh_free() in case of any batadv_*_init() calls failure. This approach may work well, when there is some kind of indicator, which can tell which parts of batadv are initialized; but there isn't any. All written above lead to cleaning up uninitialized fields. Even if we hide ODEBUG warning by initializing bat_priv->nc.work, syzbot was able to hit GPF in batadv_nc_purge_paths(), because hash pointer in still NULL. [1] To fix these bugs we can unwind batadv_*_init() calls one by one. It is good approach for 2 reasons: 1) It fixes bugs on error handling path 2) It improves the performance, since we won't call unneeded batadv_*_free() functions. So, this patch makes all batadv_*_init() clean up all allocated memory before returning with an error to no call correspoing batadv_*_free() and open-codes batadv_mesh_free() with proper order to avoid touching uninitialized fields.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-22 14:23 UTC
CWE
  • CWE-544 - Missing Standardized Error Handling Mechanism
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 0c6b199f09be489c48622537a550787fc80aea73 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < e50f957652190b5a88a8ebce7e5ab14ebd0d3f00 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < fbf150b16a3635634b7dfb7f229d8fcd643c6c51 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 6422e8471890273994fe8cc6d452b0dcd2c9483e (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < b0a2cd38553c77928ef1646ed1518486b1e70ae8 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < a8f7359259dd5923adc6129284fdad12fc5db347 (git)
Affected: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 , < 6f68cd634856f8ca93bafd623ba5357e0f648c68 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 4.4.293 , ≤ 4.4.* (semver)
Unaffected: 4.9.289 , ≤ 4.9.* (semver)
Unaffected: 4.14.254 , ≤ 4.14.* (semver)
Unaffected: 4.19.215 , ≤ 4.19.* (semver)
Unaffected: 5.4.157 , ≤ 5.4.* (semver)
Unaffected: 5.10.77 , ≤ 5.10.* (semver)
Unaffected: 5.14.16 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
linux kernel Affected: c6c8fea29769 , < 6f68cd634856 (custom)
    cpe:2.3:a:linux:kernel:*:*:*:*:*:*:*:*
Create a notification for this product.
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      "cve": "CVE-2021-47482",
      "id": "msrc_CVE-2021-47482",
      "initial_release_date": "2024-05-02T07:00:00.000Z",
      "product_status:fixed": "3",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: batman-adv: fix error handling",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2021-47482.json",
      "version": "2"
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Even if we hide\\nODEBUG warning by initializing bat_priv-\u003enc.work, syzbot was able to hit\\nGPF in batadv_nc_purge_paths(), because hash pointer in still NULL. [1]\\n\\nTo fix these bugs we can unwind batadv_*_init() calls one by one.\\nIt is good approach for 2 reasons: 1) It fixes bugs on error handling\\npath 2) It improves the performance, since we won\u0027t call unneeded\\nbatadv_*_free() functions.\\n\\nSo, this patch makes all batadv_*_init() clean up all allocated memory\\nbefore returning with an error to no call correspoing batadv_*_free()\\nand open-codes batadv_mesh_free() with proper order to avoid touching\\nuninitialized fields.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: batman-adv: correcci\u00f3n de manejo de errores Syzbot inform\u00f3 advertencia ODEBUG en batadv_nc_mesh_free(). El problema estaba en el manejo incorrecto de errores en batadv_mesh_init(). Antes de este parche, batadv_mesh_init() llamaba a batadv_mesh_free() en caso de que fallara alguna llamada a batadv_*_init(). Este enfoque puede funcionar bien cuando hay alg\u00fan tipo de indicador que puede indicar qu\u00e9 partes de batadv est\u00e1n inicializadas; pero no hay ninguno. Todo lo escrito anteriormente conduce a la sanitizaci\u00f3n de campos no inicializados. Incluso si ocultamos la advertencia ODEBUG inicializando bat_priv-\u0026gt;nc.work, syzbot pudo presionar GPF en batadv_nc_purge_paths(), porque el puntero hash todav\u00eda es NULL. [1] Para corregir estos errores podemos desenredar las llamadas batadv_*_init() una por una. Es un buen enfoque por 2 razones: 1) Corrige errores en la ruta de manejo de errores 2) Mejora el rendimiento, ya que no llamaremos a funciones batadv_*_free() innecesarias. Entonces, este parche hace que batadv_*_init() limpie toda la memoria asignada antes de regresar con un error de no llamada correspondiente a batadv_*_free() y c\u00f3digos abiertos batadv_mesh_free() con el orden adecuado para evitar tocar campos no 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    "redhat_vex": {
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      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
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      "title": "kernel: net: batman-adv: fix error handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47482.json",
      "version": "3"
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      "product_status:known_affected": "388",
      "product_status:known_not_affected": "78",
      "product_status:recommended": "587",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47482",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47482.json",
      "version": "58"
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      "cveMetadata": "{\"cveId\": \"CVE-2021-47482\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:55:32.415Z\", \"dateReserved\": \"2024-05-22T06:20:56.200Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T08:19:34.174Z\", \"assignerShortName\": \"Linux\"}",
      "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.


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.