CVE-2026-43451

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If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN\npresent but NFQA_VLAN_TCI missing), the function returns immediately\nwithout freeing the dequeued entry or its sk_buff.\n\nThis leaks the nf_queue_entry, its associated sk_buff, and all held\nreferences (net_device refcounts, struct net refcount). Repeated\ntriggering exhausts kernel memory.\n\nFix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict\non the error path, consistent with other error handling in this file."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nfnetlink_queue.c"], "versions": [{"version": "8d45ff22f1b43249f0cf1baafe0262ca10d1666e", "lessThan": "a907bea273b60d3e604ec4e8e1f6c49954805794", "status": "affected", "versionType": "git"}, {"version": "8d45ff22f1b43249f0cf1baafe0262ca10d1666e", "lessThan": "0b18d1b834ab5a5009be70b530f978d7989e445b", "status": "affected", "versionType": "git"}, {"version": "8d45ff22f1b43249f0cf1baafe0262ca10d1666e", "lessThan": "b38d2b4603fd3dda24eb8b3dd81c18a0930be97b", "status": "affected", "versionType": "git"}, {"version": "8d45ff22f1b43249f0cf1baafe0262ca10d1666e", "lessThan": 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find_dequeue_entry() to remove the queue\nentry from the queue data structures, taking ownership of the entry.\nFor PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN\nattributes. If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN\npresent but NFQA_VLAN_TCI missing), the function returns immediately\nwithout freeing the dequeued entry or its sk_buff.\n\nThis leaks the nf_queue_entry, its associated sk_buff, and all held\nreferences (net_device refcounts, struct net refcount). Repeated\ntriggering exhausts kernel memory.\n\nFix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict\non the error path, consistent with other error handling in this file."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nfnetlink_queue: corregir fuga de entrada en la ruta de error del veredicto de puente\n\nnfqnl_recv_verdict() llama a find_dequeue_entry() para eliminar la entrada de la cola de las estructuras de datos de la cola, tomando posesi\u00f3n de la entrada. Para paquetes PF_BRIDGE, luego llama a nfqa_parse_bridge() para analizar atributos VLAN. Si nfqa_parse_bridge() devuelve un error (p. ej., NFQA_VLAN presente pero NFQA_VLAN_TCI ausente), la funci\u00f3n regresa inmediatamente sin liberar la entrada desencolada o su sk_buff.\n\nEsto fuga el nf_queue_entry, su sk_buff asociado y todas las referencias mantenidas (recuentos de referencia de net_device, recuento de referencia de struct net). El desencadenamiento repetido agota la memoria del kernel.\n\nSolucione esto descartando la entrada a trav\u00e9s de nfqnl_reinject() con veredicto NF_DROP en la ruta de error, consistente con otro manejo de errores en este archivo."}], "id": "CVE-2026-43451", "lastModified": "2026-11-11T20:10:00.273", "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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43451", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:39:18.435118Z", "version": "2.0.3"}}]}, "published": "2026-05-08T15:16:57.773", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path", "id": "2468239", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468239"}, "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-772", "details": ["A flaw was found in the Linux kernel's netfilter component. A remote attacker can exploit this by sending specially crafted network packets that cause an error during VLAN attribute parsing in the nfnetlink_queue module. This leads to a memory leak, where kernel memory is not properly released. Repeated exploitation can exhaust kernel memory, resulting in a Denial of Service (DoS) for the system."], "name": "CVE-2026-43451", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43451\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43451\nhttps://lore.kernel.org/linux-cve-announce/2026050857-CVE-2026-43451-1195@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8d45ff22f1b43249f0cf1baafe0262ca10d1666e,a907bea273b60d3e604ec4e8e1f6c49954805794)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8d45ff22f1b43249f0cf1baafe0262ca10d1666e,47b1c5d1b0944aa88299f55a846fabaefc756982)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8d45ff22f1b43249f0cf1baafe0262ca10d1666e,b38d2b4603fd3dda24eb8b3dd81c18a0930be97b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8d45ff22f1b43249f0cf1baafe0262ca10d1666e,47b1c5d1b0944aa88299f55a846fabaefc756982)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8d45ff22f1b43249f0cf1baafe0262ca10d1666e,cf4a4df38d1747e06fc54f9879bd7a6f4178032f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8d45ff22f1b43249f0cf1baafe0262ca10d1666e,9853d94b82d303fc4ac37d592a23a154096ecd41)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8d45ff22f1b43249f0cf1baafe0262ca10d1666e,208669df703a25a601f45822b10c413f258bf275)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8d45ff22f1b43249f0cf1baafe0262ca10d1666e,f1ba83755d81c6fc66ac7acd723d238f974091e9)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.253,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.203,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.167,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.130,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.78,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.19,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.9,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-08T18:00:16.881570+00:00", "updated": "2026-05-21T18:45:17.081127+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}