cve-2021-47482
Vulnerability from cvelistv5
Published
2024-05-22 08:19
Modified
2024-12-19 07:43
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/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51
Impacted products
Vendor Product Version
Linux Linux Version: 2.6.38
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:linux:kernel:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "kernel",
            "vendor": "linux",
            "versions": [
              {
                "lessThan": "6f68cd634856",
                "status": "affected",
                "version": "c6c8fea29769",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-47482",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-22T14:23:49.834451Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-544",
                "description": "CWE-544 Missing Standardized Error Handling Mechanism",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:15:18.900Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:39:59.554Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/bridge_loop_avoidance.c",
            "net/batman-adv/main.c",
            "net/batman-adv/network-coding.c",
            "net/batman-adv/translation-table.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0c6b199f09be489c48622537a550787fc80aea73",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "e50f957652190b5a88a8ebce7e5ab14ebd0d3f00",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "fbf150b16a3635634b7dfb7f229d8fcd643c6c51",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "6422e8471890273994fe8cc6d452b0dcd2c9483e",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "b0a2cd38553c77928ef1646ed1518486b1e70ae8",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "a8f7359259dd5923adc6129284fdad12fc5db347",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            },
            {
              "lessThan": "6f68cd634856f8ca93bafd623ba5357e0f648c68",
              "status": "affected",
              "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/bridge_loop_avoidance.c",
            "net/batman-adv/main.c",
            "net/batman-adv/network-coding.c",
            "net/batman-adv/translation-table.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.38"
            },
            {
              "lessThan": "2.6.38",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.293",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.289",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.254",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.215",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T07:43:15.740Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "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"
        }
      ],
      "title": "net: batman-adv: fix error handling",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47482",
    "datePublished": "2024-05-22T08:19:34.174Z",
    "dateReserved": "2024-05-22T06:20:56.200Z",
    "dateUpdated": "2024-12-19T07:43:15.740Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47482\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T09:15:10.150\",\"lastModified\":\"2024-11-21T06:36:17.430\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.6,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-544\"}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.