CVE-2024-45009

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Before this patch, and upon the reception of the\nRM_ADDR, the other peer will then try to decrement this\nadd_addr_accepted. That's not correct because the attached subflows have\nnot been created upon the reception of an ADD_ADDR.\n\nA way to solve that is to decrement the counter only if the attached\nsubflow was an MP_JOIN to a remote id that was not 0, and initiated by\nthe host receiving the RM_ADDR."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 8.2, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable counter decrement is driven entirely by an RM_ADDR MPTCP option parsed out of a received TCP segment (options.c:1174 \u2192 mptcp_pm_rm_addr_received()), so any remote peer of an MPTCP connection can reach it over the network. MPTCP servers (IPPROTO_MPTCP listeners on cloud/mobile/edge systems) accept these from arbitrary internet clients.\nAC:L - The attacker fully controls both the MP_JOIN that creates the non-ADD_ADDR subflow and the subsequent RM_ADDR that removes it, with the address ID chosen by the attacker; no race, memory layout, or victim-side timing is involved. Default settings (kernel path manager, subflows_max=2, accept_subflow=true) suffice, making the underflow deterministic and repeatable.\nPR:N - MPTCP has no authentication layer above TCP \u2014 a client connecting to an MPTCP-enabled service, or a malicious server a client connects to, can drive this without any credentials or local account. No capability, namespace, or netlink access is needed anywhere along the path.\nUI:N - Against an MPTCP-enabled listening service the attacker initiates the connection and sends the MP_JOIN and RM_ADDR options itself. No victim action is required beyond the service already running.\nS:U - The corrupted state (msk->pm.add_addr_accepted and pm.accept_addr) and all consequences remain within the kernel networking stack of the affected host. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is an arithmetic underflow of an internal accounting counter; it yields no out-of-bounds read, no kernel pointer exposure, and no path for reading memory the attacker should not see. Subflows forced open by the bypass still require the connection keys for MP_JOIN, so no session data is disclosed to third parties.\nI:L - A remote unauthenticated peer corrupts kernel path-manager state (counter wraps 0 \u2192 255 and accept_addr is forced true), bypassing the administrator-configured net.mptcp add_addr_accepted limit \u2014 including its default value of 0 meaning \"accept none\". This modifies protected kernel state and alters the host's path-management behavior, but grants no arbitrary write or control-flow influence.\nA:H - The underflowed counter defeats the sole resource-protection control on accepted address announcements, letting a remote peer repeatedly cycle MP_JOIN/RM_ADDR to refill the ADD_ADDR budget and drive unbounded attacker-directed subflow and socket creation from the victim. Sustained across many parallel connections this is a plausible resource-exhaustion denial of service, and the higher rating is taken given the uncertainty in bounding it."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mptcp/pm_netlink.c"], "versions": [{"version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "35b31f5549ede4070566b949781e83495906b43d", "status": "affected", "versionType": "git"}, {"version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "85b866e4c4e63a1d7afb58f1e24273caad03d0b7", "status": "affected", "versionType": "git"}, {"version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "d20bf2c96d7ffd171299b32f562f70e5bf5dc608", "status": "affected", "versionType": "git"}, {"version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "2060f1efab370b496c4903b840844ecaff324c3c", "status": "affected", "versionType": "git"}, {"version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "1c1f721375989579e46741f59523e39ec9b2a9bd", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mptcp/pm_netlink.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.167", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.107", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.48", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.7", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.107"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.48"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.10.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/35b31f5549ede4070566b949781e83495906b43d"}, {"url": "https://git.kernel.org/stable/c/85b866e4c4e63a1d7afb58f1e24273caad03d0b7"}, {"url": "https://git.kernel.org/stable/c/d20bf2c96d7ffd171299b32f562f70e5bf5dc608"}, {"url": "https://git.kernel.org/stable/c/2060f1efab370b496c4903b840844ecaff324c3c"}, {"url": "https://git.kernel.org/stable/c/1c1f721375989579e46741f59523e39ec9b2a9bd"}], "title": "mptcp: pm: only decrement add_addr_accepted for MPJ req", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-09-29T15:51:12.192901Z", "id": "CVE-2024-45009", "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": "2024-09-29T15:51:26.527Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:15:15.298Z"}}]}}

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MPTCP servers (IPPROTO_MPTCP listeners on cloud/mobile/edge systems) accept these from arbitrary internet clients.\nAC:L - The attacker fully controls both the MP_JOIN that creates the non-ADD_ADDR subflow and the subsequent RM_ADDR that removes it, with the address ID chosen by the attacker; no race, memory layout, or victim-side timing is involved. Default settings (kernel path manager, subflows_max=2, accept_subflow=true) suffice, making the underflow deterministic and repeatable.\nPR:N - MPTCP has no authentication layer above TCP \u2014 a client connecting to an MPTCP-enabled service, or a malicious server a client connects to, can drive this without any credentials or local account. No capability, namespace, or netlink access is needed anywhere along the path.\nUI:N - Against an MPTCP-enabled listening service the attacker initiates the connection and sends the MP_JOIN and RM_ADDR options itself. No victim action is required beyond the service already running.\nS:U - The corrupted state (msk->pm.add_addr_accepted and pm.accept_addr) and all consequences remain within the kernel networking stack of the affected host. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is an arithmetic underflow of an internal accounting counter; it yields no out-of-bounds read, no kernel pointer exposure, and no path for reading memory the attacker should not see. Subflows forced open by the bypass still require the connection keys for MP_JOIN, so no session data is disclosed to third parties.\nI:L - A remote unauthenticated peer corrupts kernel path-manager state (counter wraps 0 \u2192 255 and accept_addr is forced true), bypassing the administrator-configured net.mptcp add_addr_accepted limit \u2014 including its default value of 0 meaning \"accept none\". This modifies protected kernel state and alters the host's path-management behavior, but grants no arbitrary write or control-flow influence.\nA:H - The underflowed counter defeats the sole resource-protection control on accepted address announcements, letting a remote peer repeatedly cycle MP_JOIN/RM_ADDR to refill the ADD_ADDR budget and drive unbounded attacker-directed subflow and socket creation from the victim. Sustained across many parallel connections this is a plausible resource-exhaustion denial of service, and the higher rating is taken given the uncertainty in bounding it."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "35b31f5549ede4070566b949781e83495906b43d", "versionType": "git"}, {"status": "affected", "version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "85b866e4c4e63a1d7afb58f1e24273caad03d0b7", "versionType": "git"}, {"status": "affected", "version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "d20bf2c96d7ffd171299b32f562f70e5bf5dc608", "versionType": "git"}, {"status": "affected", "version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "2060f1efab370b496c4903b840844ecaff324c3c", "versionType": "git"}, {"status": "affected", "version": "d0876b2284cf8b34dd214b2d0aa21071c345da59", "lessThan": "1c1f721375989579e46741f59523e39ec9b2a9bd", "versionType": "git"}], "programFiles": ["net/mptcp/pm_netlink.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.167", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.107", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.48", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.10.7", "versionType": "semver", "lessThanOrEqual": "6.10.*"}, {"status": "unaffected", "version": "6.11", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/mptcp/pm_netlink.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/35b31f5549ede4070566b949781e83495906b43d"}, {"url": "https://git.kernel.org/stable/c/85b866e4c4e63a1d7afb58f1e24273caad03d0b7"}, {"url": "https://git.kernel.org/stable/c/d20bf2c96d7ffd171299b32f562f70e5bf5dc608"}, {"url": "https://git.kernel.org/stable/c/2060f1efab370b496c4903b840844ecaff324c3c"}, {"url": "https://git.kernel.org/stable/c/1c1f721375989579e46741f59523e39ec9b2a9bd"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: only decrement add_addr_accepted for MPJ req\n\nAdding the following warning ...\n\n WARN_ON_ONCE(msk->pm.add_addr_accepted == 0)\n\n... before decrementing the add_addr_accepted counter helped to find a\nbug when running the \"remove single subflow\" subtest from the\nmptcp_join.sh selftest.\n\nRemoving a 'subflow' endpoint will first trigger a RM_ADDR, then the\nsubflow closure. Before this patch, and upon the reception of the\nRM_ADDR, the other peer will then try to decrement this\nadd_addr_accepted. That's not correct because the attached subflows have\nnot been created upon the reception of an ADD_ADDR.\n\nA way to solve that is to decrement the counter only if the attached\nsubflow was an MP_JOIN to a remote id that was not 0, and initiated by\nthe host receiving the RM_ADDR."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.167", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.107", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.48", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10.7", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11", "versionStartIncluding": "5.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:37:39.508Z"}}}, "cveMetadata": {"cveId": "CVE-2024-45009", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:37:39.508Z", "dateReserved": "2024-08-21T05:34:56.679Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-09-11T15:13:47.719Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Before this patch, and upon the reception of the\nRM_ADDR, the other peer will then try to decrement this\nadd_addr_accepted. That's not correct because the attached subflows have\nnot been created upon the reception of an ADD_ADDR.\n\nA way to solve that is to decrement the counter only if the attached\nsubflow was an MP_JOIN to a remote id that was not 0, and initiated by\nthe host receiving the RM_ADDR."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: pm: solo decrementar add_addr_accepted para solicitud MPJ Agregar la siguiente advertencia ... WARN_ON_ONCE(msk->pm.add_addr_accepted == 0) ... antes de decrementar el contador add_addr_accepted ayud\u00f3 a encontrar un error al ejecutar la subprueba \"eliminar un solo subflujo\" de la autoprueba mptcp_join.sh. Eliminar un endpoint de 'subflujo' primero activar\u00e1 un RM_ADDR, luego el cierre del subflujo. Antes de este parche, y tras la recepci\u00f3n del RM_ADDR, el otro par intentar\u00e1 decrementar este add_addr_accepted. Eso no es correcto porque los subflujos adjuntos no se han creado tras la recepci\u00f3n de un ADD_ADDR. Una forma de resolver esto es disminuir el contador solo si el subflujo adjunto fue un MP_JOIN a una identificaci\u00f3n remota que no era 0, e iniciado por el host que recibi\u00f3 el RM_ADDR."}], "id": "CVE-2024-45009", "lastModified": "2026-08-04T11:20:09.870", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"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-2024-45009", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-29T15:51:12.192901Z", "version": "2.0.3"}}]}, "published": "2024-09-11T16:15:06.427", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c1f721375989579e46741f59523e39ec9b2a9bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2060f1efab370b496c4903b840844ecaff324c3c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/35b31f5549ede4070566b949781e83495906b43d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/85b866e4c4e63a1d7afb58f1e24273caad03d0b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d20bf2c96d7ffd171299b32f562f70e5bf5dc608"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: mptcp: pm: only decrement add_addr_accepted for MPJ req", "id": "2311706", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2311706"}, "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": "verified"}, "cwe": "CWE-664", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmptcp: pm: only decrement add_addr_accepted for MPJ req\nAdding the following warning ...\nWARN_ON_ONCE(msk->pm.add_addr_accepted == 0)\n... before decrementing the add_addr_accepted counter helped to find a\nbug when running the \"remove single subflow\" subtest from the\nmptcp_join.sh selftest.\nRemoving a 'subflow' endpoint will first trigger a RM_ADDR, then the\nsubflow closure. Before this patch, and upon the reception of the\nRM_ADDR, the other peer will then try to decrement this\nadd_addr_accepted. That's not correct because the attached subflows have\nnot been created upon the reception of an ADD_ADDR.\nA way to solve that is to decrement the counter only if the attached\nsubflow was an MP_JOIN to a remote id that was not 0, and initiated by\nthe host receiving the RM_ADDR."], "name": "CVE-2024-45009", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-45009\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-45009\nhttps://lore.kernel.org/linux-cve-announce/2024091104-CVE-2024-45009-24ea@gregkh/T"], "threat_severity": "Moderate"}

{}