CVE-2026-31681

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As a result, malformed\nrules can mark the last slot as a range start or place two range starts\nback to back, leaving ports_match_v1() to step past the last valid\nports[] element while interpreting the rule.\n\nReject malformed multiport v1 rules in checkentry by validating that\neach range start has a following element and that the following element\nis not itself marked as another range start."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/xt_multiport.c"], "versions": [{"version": "a89ecb6a2ef732d04058d87801e2b6bd7e5c7089", "lessThan": "8c5bf8f5b478f569191c4a7982de7cd5f5f73c1a", "status": "affected", "versionType": "git"}, {"version": "a89ecb6a2ef732d04058d87801e2b6bd7e5c7089", "lessThan": "c9749f6232c845e31c21d4cc72200211df15d8a2", "status": "affected", "versionType": "git"}, {"version": "a89ecb6a2ef732d04058d87801e2b6bd7e5c7089", 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As a result, malformed\nrules can mark the last slot as a range start or place two range starts\nback to back, leaving ports_match_v1() to step past the last valid\nports[] element while interpreting the rule.\n\nReject malformed multiport v1 rules in checkentry by validating that\neach range start has a following element and that the following element\nis not itself marked as another range start."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: xt_multiport: validar la codificaci\u00f3n de rango en checkentry\n\nports_match_v1() trata cualquier entrada pflags distinta de cero como el inicio de un rango de puertos y consume incondicionalmente el siguiente elemento ports[] como el final del rango.\n\nLa ruta checkentry actualmente valida el protocolo, los flags y el conteo, pero no valida la codificaci\u00f3n de rango en s\u00ed misma. Como resultado, las reglas malformadas pueden marcar la \u00faltima ranura como un inicio de rango o colocar dos inicios de rango consecutivos, lo que hace que ports_match_v1() pase por alto el \u00faltimo elemento ports[] v\u00e1lido mientras interpreta la regla.\n\nRechazar reglas multiport v1 malformadas en checkentry validando que cada inicio de rango tiene un elemento siguiente y que el elemento siguiente no est\u00e1 marcado a su vez como otro inicio de rango."}], "id": "CVE-2026-31681", "lastModified": "2026-11-11T23:10:00.263", "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-2026-31681", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:24:10.438722Z", "version": "2.0.3"}}]}, "published": "2026-04-25T09:16:01.800", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e4baa853f1cc4227e04f52d6860524707cfb294"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/36bf0d98e180a7c384c8d8a59b0d2d4b80e5eb16"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8368ce8eb01f0b91111d814703696e780d0ef12f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8c5bf8f5b478f569191c4a7982de7cd5f5f73c1a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aec14808271f2bf2b656de6ff12dfe73c5fd3b67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b67d638cbee9975c765feb45c126e96ed11ec802"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c9749f6232c845e31c21d4cc72200211df15d8a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ff64c5bfef12461df8450e0f50bb693b5269c720"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netfilter: xt_multiport: validate range encoding in checkentry", "id": "2461753", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461753"}, "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-1285", "details": ["A flaw was found in the Linux kernel's netfilter xt_multiport module. This vulnerability arises from insufficient validation of range encoding within the `checkentry` function. A local attacker can exploit this by crafting malformed multiport rules, which causes the `ports_match_v1()` function to read beyond its intended memory boundary. This out-of-bounds read can lead to a denial of service (DoS) or potentially disclose sensitive information."], "name": "CVE-2026-31681", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "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": "2026-04-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31681\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31681\nhttps://lore.kernel.org/linux-cve-announce/2026042545-CVE-2026-31681-3c5b@gregkh/T"], "threat_severity": "Moderate"}

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