{"id":"CVE-2021-47482","state":"PUBLISHED","title":"net: batman-adv: fix error handling","description":"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.","publishedAt":"2024-05-22T08:19:34.174Z","updatedAt":"2026-05-11T13:55:32.415Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"0c6b199f09be489c48622537a550787fc80aea73","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"e50f957652190b5a88a8ebce7e5ab14ebd0d3f00","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"fbf150b16a3635634b7dfb7f229d8fcd643c6c51","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"6422e8471890273994fe8cc6d452b0dcd2c9483e","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"b0a2cd38553c77928ef1646ed1518486b1e70ae8","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"a8f7359259dd5923adc6129284fdad12fc5db347","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"6f68cd634856f8ca93bafd623ba5357e0f648c68","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"4.4.293","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.289","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.254","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.215","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.157","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.77","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.16","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","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"]}],"references":["https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73","https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20","https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00","https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51","https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e","https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8","https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347","https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68"],"weaknesses":["CWE-544"],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47482.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47482","state":"PUBLISHED","datePublished":"2024-05-22T08:19:34.174Z","dateUpdated":"2026-05-11T13:55:32.415Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-22T06:20:56.200Z"},"containers":{"cna":{"title":"net: batman-adv: fix error handling","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"0c6b199f09be489c48622537a550787fc80aea73","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"e50f957652190b5a88a8ebce7e5ab14ebd0d3f00","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"fbf150b16a3635634b7dfb7f229d8fcd643c6c51","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"6422e8471890273994fe8cc6d452b0dcd2c9483e","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"b0a2cd38553c77928ef1646ed1518486b1e70ae8","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"a8f7359259dd5923adc6129284fdad12fc5db347","versionType":"git"},{"version":"c6c8fea29769d998d94fcec9b9f14d4b52b349d3","status":"affected","lessThan":"6f68cd634856f8ca93bafd623ba5357e0f648c68","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.38","versionType":"semver"},{"version":"4.4.293","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.289","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.254","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.215","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.157","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.77","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.16","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","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"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:55:32.415Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"4.4.293"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"4.9.289"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"4.14.254"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"4.19.215"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.4.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.10.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.14.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.38","versionEndExcluding":"5.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","affected":[{"vendor":"linux","product":"kernel","defaultStatus":"unknown","versions":[{"version":"c6c8fea29769","status":"affected","lessThan":"6f68cd634856","versionType":"custom"}],"cpes":["cpe:2.3:a:linux:kernel:*:*:*:*:*:*:*:*"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2021-47482","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-05-22T14:23:49.834451Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-544","lang":"en","type":"CWE","description":"CWE-544 Missing Standardized Error Handling Mechanism"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:15:18.900Z"}},{"title":"CVE Program Container","references":[{"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","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:39:59.554Z"}}]}}}