{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-45009", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T05:34:56.679Z", "datePublished": "2024-09-11T15:13:47.719Z", "dateUpdated": "2026-08-05T11:37:39.508Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:37:39.508Z" }, "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." } ], "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 → 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 — 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 → 255 and accept_addr is forced true), bypassing the administrator-configured net.mptcp add_addr_accepted limit — 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" } } ] } }