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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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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": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:40:06+00:00",
      "cve": "CVE-2021-47482",
      "id": "CVE-2021-47482",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "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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\"https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73\"}, {\"url\": \"https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20\"}, {\"url\": \"https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00\"}, {\"url\": \"https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51\"}, {\"url\": \"https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e\"}, {\"url\": \"https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8\"}, {\"url\": \"https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347\"}, {\"url\": \"https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: batman-adv: fix error handling\\n\\nSyzbot reported ODEBUG warning in batadv_nc_mesh_free(). The problem was\\nin wrong error handling in batadv_mesh_init().\\n\\nBefore this patch batadv_mesh_init() was calling batadv_mesh_free() in case\\nof any batadv_*_init() calls failure. This approach may work well, when\\nthere is some kind of indicator, which can tell which parts of batadv are\\ninitialized; but there isn\u0027t any.\\n\\nAll written above lead to cleaning up uninitialized fields. 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.293\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.289\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.254\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.215\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.157\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.77\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.16\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"2.6.38\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T13:55:32.415Z\"}}}",
      "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.