CVE-2026-31407

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[..]\n\n and: ... with exp->dir = 100, the access at\n ct->master->tuplehash[100] reads 5600 bytes past the start of a\n 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n UBSAN."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Reachability is through NETLINK_NETFILTER ctnetlink messages sent by a local process. Later packet processing can trigger the bad state or expectation, but the attacker must first inject the malformed conntrack/expectation attributes locally.\nAC:L - The bug is triggered with crafted netlink attributes and does not require winning a race. The attacker can create the relevant conntrack/expectation state and matching traffic in a controlled network namespace.\nPR:L - nfnetlink requires CAP_NET_ADMIN in the socket's network namespace. Because this capability is reachable via user and network namespaces on affected deployments, this is low privilege rather than high privilege.\nUI:N - No victim action is required after the attacker can send the netlink request. The attacker can trigger the vulnerable paths directly.\nS:U - The impact remains within the kernel security authority. This is not a VM escape or cross-authority boundary bypass.\nC:H - The missing validation permits attacker-controlled out-of-bounds reads, including indexing beyond the master nf_conn tuplehash and SCTP state tables. This is not strictly bounded to a harmless few bytes, so high confidentiality impact is defensible.\nI:N - The investigated paths show out-of-bounds reads and invalid in-object state assignment, not an out-of-bounds write or control-flow overwrite. No direct integrity-impacting primitive was identified.\nA:H - The out-of-bounds reads are attacker-triggerable and were reported as UBSAN-confirmed slab out-of-bounds accesses. Such kernel faults can produce an oops or panic, so availability impact is high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_conntrack_netlink.c", "net/netfilter/nf_conntrack_proto_sctp.c"], "versions": [{"version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "e7b5766693477c52424cc6c79dd30a7a9c7db52c", "status": "affected", "versionType": "git"}, {"version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "78bba9f73942aa7dca47d817d8cec0fb9b443b70", "status": "affected", "versionType": "git"}, {"version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "be88a337bf07afb1ee173f1099294d1b7ab3fefe", "status": "affected", "versionType": "git"}, {"version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "c5e918390002edf0cff80a0e7ce1f86f16a9507c", "status": "affected", "versionType": "git"}, {"version": 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Later packet processing can trigger the bad state or expectation, but the attacker must first inject the malformed conntrack/expectation attributes locally.\nAC:L - The bug is triggered with crafted netlink attributes and does not require winning a race. The attacker can create the relevant conntrack/expectation state and matching traffic in a controlled network namespace.\nPR:L - nfnetlink requires CAP_NET_ADMIN in the socket's network namespace. Because this capability is reachable via user and network namespaces on affected deployments, this is low privilege rather than high privilege.\nUI:N - No victim action is required after the attacker can send the netlink request. The attacker can trigger the vulnerable paths directly.\nS:U - The impact remains within the kernel security authority. This is not a VM escape or cross-authority boundary bypass.\nC:H - The missing validation permits attacker-controlled out-of-bounds reads, including indexing beyond the master nf_conn tuplehash and SCTP state tables. This is not strictly bounded to a harmless few bytes, so high confidentiality impact is defensible.\nI:N - The investigated paths show out-of-bounds reads and invalid in-object state assignment, not an out-of-bounds write or control-flow overwrite. No direct integrity-impacting primitive was identified.\nA:H - The out-of-bounds reads are attacker-triggerable and were reported as UBSAN-confirmed slab out-of-bounds accesses. Such kernel faults can produce an oops or panic, so availability impact is high."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "e7b5766693477c52424cc6c79dd30a7a9c7db52c", "versionType": "git"}, {"status": "affected", "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "78bba9f73942aa7dca47d817d8cec0fb9b443b70", "versionType": "git"}, {"status": "affected", "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "be88a337bf07afb1ee173f1099294d1b7ab3fefe", "versionType": "git"}, {"status": "affected", "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "c5e918390002edf0cff80a0e7ce1f86f16a9507c", "versionType": "git"}, {"status": "affected", "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "9174d28f3f15d8c4962f5980c0be167633880443", "versionType": "git"}, {"status": "affected", "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "67c53c1978cef3c504237275e39c857e2f6af56e", "versionType": "git"}, {"status": "affected", "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "0fbae1e74493d5a160a70c51aeba035d8266ea7d", "versionType": "git"}, {"status": "affected", "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05", "versionType": "git"}], "programFiles": ["net/netfilter/nf_conntrack_netlink.c", "net/netfilter/nf_conntrack_proto_sctp.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.27"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.27", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.136", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.83", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.24", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.10", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/netfilter/nf_conntrack_netlink.c", "net/netfilter/nf_conntrack_proto_sctp.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c"}, {"url": "https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70"}, {"url": "https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe"}, {"url": "https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c"}, {"url": "https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443"}, {"url": "https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e"}, {"url": "https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d"}, {"url": "https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: add missing netlink policy validations\n\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\n\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\n\nQuoting the reporter:\n nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\n value directly to ct->proto.sctp.state without checking that it is\n within the valid range. [..]\n\n and: ... with exp->dir = 100, the access at\n ct->master->tuplehash[100] reads 5600 bytes past the start of a\n 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n UBSAN."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.258", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.136", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.83", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.24", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.10", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.27"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:16.533Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31407", "state": "PUBLISHED", "dateUpdated": "2026-10-19T18:35:47.097Z", "dateReserved": "2026-03-09T15:48:24.086Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-04-06T07:38:19.712Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B3457033-D01A-43C8-836D-8E21A577B7A5", "versionEndExcluding": "6.6.136", "versionStartIncluding": "2.6.27", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8", "versionEndExcluding": "6.12.83", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555", "versionEndExcluding": "6.18.24", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "96D34333-38BE-4414-9E79-6EB764329581", "versionEndExcluding": "6.19.10", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: add missing netlink policy validations\n\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\n\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\n\nQuoting the reporter:\n nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\n value directly to ct->proto.sctp.state without checking that it is\n within the valid range. [..]\n\n and: ... with exp->dir = 100, the access at\n ct->master->tuplehash[100] reads 5600 bytes past the start of a\n 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n UBSAN."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: conntrack: a\u00f1adir validaciones de pol\u00edticas netlink faltantes\n\nHyunwoo Kim informa de acceso fuera de l\u00edmites en sctp y ctnetlink.\n\nEstos atributos son utilizados por el kernel sin ninguna validaci\u00f3n.\nExtender las pol\u00edticas netlink en consecuencia.\n\nCitando al informante:\n 'nlattr_to_sctp() asigna el valor CTA_PROTOINFO_SCTP_STATE proporcionado por el usuario\n directamente a ct -> proto.sctp.state sin comprobar que est\u00e9\n dentro del rango v\u00e1lido. [..]\n\n y: ... con exp -> dir = 100, el acceso en\n ct -> master -> tuplehash[100] lee 5600 bytes m\u00e1s all\u00e1 del inicio de un\n objeto nf_conn de 320 bytes, causando una lectura fuera de l\u00edmites de slab confirmada por\n UBSAN.'"}], "id": "CVE-2026-31407", "lastModified": "2026-10-19T19:17:52.043", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31407", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:08:59.610705Z", "version": "2.0.3"}}]}, "published": "2026-04-06T08:16:38.623", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05"}, {"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": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: netfilter: conntrack: add missing netlink policy validations", "id": "2455331", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455331"}, "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-125", "details": ["A flaw was found in the Linux kernel's netfilter conntrack subsystem. Missing netlink policy validations allow a local attacker to provide a specially crafted input, leading to an out-of-bounds read. This vulnerability can result in information disclosure from kernel memory or potentially cause a denial of service."], "name": "CVE-2026-31407", "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": "2026-04-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31407\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31407\nhttps://lore.kernel.org/linux-cve-announce/2026040628-CVE-2026-31407-6abd@gregkh/T"], "statement": "Unvalidated SCTP state and expectation direction allowed slab OOB reads. Attributes are consumed from nfnetlink without range checks until this fix. Requires CAP_NET_ADMIN to send the malformed netlink messages.", "threat_severity": "Moderate"}

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