FKIE_CVE-2021-47482

Vulnerability from fkie_nvd - Published: 2024-05-22 09:15 - Updated: 2026-06-17 04:17
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51Patch
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 *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
To clipboard 

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  "cveTags": [],
  "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."
    },
    {
      "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 inicializados."
    }
  ],
  "id": "CVE-2021-47482",
  "lastModified": "2026-06-17T04:17:35.843",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47482",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-22T14:23:49.834451Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-22T09:15:10.150",
  "references": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-544"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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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.

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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.
  • 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.



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.