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: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3
 Create a notification for this product.
   Linux Linux Version: 2.6.38
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{
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      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",
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      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't any.\\n\\nAll written above lead to cleaning up uninitialized fields. Even if we hide\\nODEBUG warning by initializing bat_priv->nc.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't 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: corrección de manejo de errores Syzbot informó 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 algún tipo de indicador que puede indicar qué partes de batadv están inicializadas; pero no hay ninguno. Todo lo escrito anteriormente conduce a la sanitización de campos no inicializados. Incluso si ocultamos la advertencia ODEBUG inicializando bat_priv->nc.work, syzbot pudo presionar GPF en batadv_nc_purge_paths(), porque el puntero hash todavía 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 códigos 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\"}]}}",
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[{\"cpes\": [\"cpe:2.3:a:linux:kernel:*:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"c6c8fea29769\", \"lessThan\": \"6f68cd634856\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-544\", \"description\": \"CWE-544 Missing Standardized Error Handling Mechanism\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-22T14:23:34.682Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"net: batman-adv: fix error handling\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c6c8fea29769d998d94fcec9b9f14d4b52b349d3\", \"lessThan\": 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\"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.254\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.215\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.77\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"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\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": 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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't any.\\n\\nAll written above lead to cleaning up uninitialized fields. Even if we hide\\nODEBUG warning by initializing bat_priv->nc.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't 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\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:43:15.740Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2021-47482\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:43:15.740Z\", \"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: "5.1",
      },
   },
}


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