{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47312", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:28:16.973Z", "datePublished": "2024-05-21T14:35:29.963Z", "dateUpdated": "2026-05-11T13:52:03.687Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:52:03.687Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: Fix dereference of null pointer flow\n\nIn the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then\nnft_flow_rule_create is not called and flow is NULL. The subsequent\nerror handling execution via label err_destroy_flow_rule will lead\nto a null pointer dereference on flow when calling nft_flow_rule_destroy.\nSince the error path to err_destroy_flow_rule has to cater for null\nand non-null flows, only call nft_flow_rule_destroy if flow is non-null\nto fix this issue.\n\nAddresses-Coverity: (\"Explicity null dereference\")"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_tables_api.c"], "versions": [{"version": "09b1f676e2e0bbff67c568672c565c6f31470157", "lessThan": "70a5a1950cca02c5cd161bb3846b4d983eed97d3", "status": "affected", "versionType": "git"}, {"version": "3c5e44622011b9ea21bd425875dcccfc9a158f5f", "lessThan": "4ca041f919f13783b0b03894783deee00dbca19a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_tables_api.c"], "versions": [{"version": "5.13.2", "lessThan": "5.13.5", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13.2", "versionEndExcluding": "5.13.5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/70a5a1950cca02c5cd161bb3846b4d983eed97d3"}, {"url": "https://git.kernel.org/stable/c/4ca041f919f13783b0b03894783deee00dbca19a"}], "title": "netfilter: nf_tables: Fix dereference of null pointer flow", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-476", "lang": "en", "description": "CWE-476 NULL Pointer Dereference"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2024-05-29T18:11:18.013824Z", "id": "CVE-2021-47312", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-05T14:44:02.835Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.515Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/70a5a1950cca02c5cd161bb3846b4d983eed97d3", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/4ca041f919f13783b0b03894783deee00dbca19a", "tags": ["x_transferred"]}]}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/nf_tables_api.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "70a5a1950cca02c5cd161bb3846b4d983eed97d3", "status": "affected", "version": "09b1f676e2e0bbff67c568672c565c6f31470157", "versionType": "git"}, {"lessThan": "4ca041f919f13783b0b03894783deee00dbca19a", "status": "affected", "version": "3c5e44622011b9ea21bd425875dcccfc9a158f5f", "versionType": "git"}]}, {"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/nf_tables_api.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5.13.5", "status": "affected", "version": "5.13.2", "versionType": "semver"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8BF6AAC6-D649-4E4F-98AE-B880144C2196", "versionEndExcluding": "5.13.5", "versionStartIncluding": "5.13.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: Fix dereference of null pointer flow\n\nIn the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then\nnft_flow_rule_create is not called and flow is NULL. The subsequent\nerror handling execution via label err_destroy_flow_rule will lead\nto a null pointer dereference on flow when calling nft_flow_rule_destroy.\nSince the error path to err_destroy_flow_rule has to cater for null\nand non-null flows, only call nft_flow_rule_destroy if flow is non-null\nto fix this issue.\n\nAddresses-Coverity: (\"Explicity null dereference\")"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_tables: corrige la desreferencia del flujo de puntero null. En el caso de que chain->flags & NFT_CHAIN_HW_OFFLOAD sea falso, no se llama a nft_flow_rule_create y el flujo es NULL. La ejecuci\u00f3n posterior del manejo de errores a trav\u00e9s de la etiqueta err_destroy_flow_rule dar\u00e1 lugar a una desreferencia del puntero null en el flujo al llamar a nft_flow_rule_destroy. Dado que la ruta de error a err_destroy_flow_rule tiene que atender flujos nulos y no nulos, solo llame a nft_flow_rule_destroy si el flujo no es nulo para solucionar este problema. Direcciones-Cobertura: (\"Desreferencia nula expl\u00edcita\")"}], "id": "CVE-2021-47312", "lastModified": "2026-06-17T04:17:10.103", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47312", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-29T18:11:18.013824Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:18.660", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ca041f919f13783b0b03894783deee00dbca19a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70a5a1950cca02c5cd161bb3846b4d983eed97d3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4ca041f919f13783b0b03894783deee00dbca19a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70a5a1950cca02c5cd161bb3846b4d983eed97d3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: netfilter: nf_tables: Fix dereference of null pointer flow", "id": "2282469", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282469"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: nf_tables: Fix dereference of null pointer flow\nIn the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then\nnft_flow_rule_create is not called and flow is NULL. The subsequent\nerror handling execution via label err_destroy_flow_rule will lead\nto a null pointer dereference on flow when calling nft_flow_rule_destroy.\nSince the error path to err_destroy_flow_rule has to cater for null\nand non-null flows, only call nft_flow_rule_destroy if flow is non-null\nto fix this issue.\nAddresses-Coverity: (\"Explicity null dereference\")", "A vulnerability was found in the nf_tables function in the Linux kernel's netfilter subsystem. When certain conditions are met, a flow pointer can become NULL, leading to a crash when the system tries to access it during error handling. This can disrupt network filtering operations."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47312", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47312\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47312\nhttps://lore.kernel.org/linux-cve-announce/2024052129-CVE-2021-47312-682b@gregkh/T"], "statement": "This vulnerability is rated as a moderate because this issue can cause a NULL pointer dereference, potentially crashing the netfilter system and affecting network traffic management, but it doesn't allow unauthorized access.", "threat_severity": "Moderate"}

{}