CVE-2026-89554 (GCVE-0-2026-89554)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:48
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction mptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce, backup, join_id, token and msk from the saved cookie entry when rebuilding the request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it does not restore local_id, even though the SYN path saved it. subflow_ulp_clone() then reads that uninitialized field and stores it as the joined subflow's address-ID. Because the request-sock slab is SLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale byte of a previously freed request socket, which an off-path peer can influence by sending concurrent MP_JOIN SYNs. This corrupts the path manager's id-based subflow bookkeeping for the connection. Restore subflow_req->local_id from the cookie entry, as done for the other fields.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8
Version: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8
Version: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8
Version: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8
Version: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8
Version: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8
Version: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8
Version: 9466a1ccebbe54ac57fb8a89c2b4b854826546a8
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction\n\nmptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce,\nbackup, join_id, token and msk from the saved cookie entry when rebuilding\nthe request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it\ndoes not restore local_id, even though the SYN path saved it.\nsubflow_ulp_clone() then reads that uninitialized field and stores it as\nthe joined subflow\u0027s address-ID. Because the request-sock slab is\nSLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale\nbyte of a previously freed request socket, which an off-path peer can\ninfluence by sending concurrent MP_JOIN SYNs. This corrupts the path\nmanager\u0027s id-based subflow bookkeeping for the connection.\n\nRestore subflow_req-\u003elocal_id from the cookie entry, as done for the other\nfields."
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              "value": "AV:N - The flaw is on the MPTCP MP_JOIN SYN-cookie receive path (tcp_v4_rcv/cookie_v4_check/mptcp_subflow_init_cookie_req/mptcp_token_join_cookie_init_state then subflow_ulp_clone). Any remote peer that can reach an MPTCP listener over routed IP triggers it with MP_JOIN packets when SYN cookies are in use.\nAC:L - An attacker can fill the SYN queue to force cookies (tcp_syncookies defaults to 1), spray concurrent MP_JOIN SYNs to seed the SLAB_TYPESAFE_BY_RCU request-sock cache with chosen local_id values, then complete a cookie MP_JOIN ACK. The attacker drives both the flood and the handshake; success does not depend on uninfluencable victim state.\nPR:N - No local account or capability is required. Any unauthenticated remote client obtains a token by completing MP_CAPABLE to a public MPTCP listener, then drives cookie JOIN; HMAC-valid JOIN from that peer, or slab poisoning of another connection\u0027s JOIN, needs no victim credentials.\nUI:N - Cookie MP_JOIN reconstruction runs in TCP receive softirq on attacker-sent segments; no local user mount, click, or other action is required beyond ordinary network reachability of an MPTCP service.\nS:U - Impact is confined to the host kernel\u0027s MPTCP path-manager and connection state and does not cross a VM, IOMMU, container, or other security authority.\nC:N - The uninitialized field is a single u8 address-ID leftover from a same-type request-sock slab object. It is not an out-of-bounds or pointer leak and does not disclose kernel memory contents to the attacker.\nI:L - subflow_ulp_clone stores the stale local_id as the joined subflow\u0027s address-ID, corrupting path-manager id-based bookkeeping (endpoint availability, ADD_ADDR/REMOVE_ADDR matching, and ID-0 primary-path identity). The modification is limited to that protocol ID and is not an arbitrary kernel write or control-flow primitive.\nA:H - A poisoned local_id of 0 or a colliding endpoint ID makes later REMOVE_ADDR/RMSUBFLOW close the initial or other still-needed subflows via mptcp_close_ssk, and desynchronized PM state can reject further joins or tear down the MPTCP session. An attacker can repeat this against many connections on an internet-facing MPTCP service."
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    "datePublished": "2026-09-11T19:44:27.586Z",
    "dateReserved": "2026-09-11T19:38:34.724Z",
    "dateUpdated": "2026-10-19T08:48:47.068Z",
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Any remote peer that can reach an MPTCP listener over routed IP triggers it with MP_JOIN packets when SYN cookies are in use.\\nAC:L - An attacker can fill the SYN queue to force cookies (tcp_syncookies defaults to 1), spray concurrent MP_JOIN SYNs to seed the SLAB_TYPESAFE_BY_RCU request-sock cache with chosen local_id values, then complete a cookie MP_JOIN ACK. The attacker drives both the flood and the handshake; success does not depend on uninfluencable victim state.\\nPR:N - No local account or capability is required. 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It is not an out-of-bounds or pointer leak and does not disclose kernel memory contents to the attacker.\\nI:L - subflow_ulp_clone stores the stale local_id as the joined subflow\u0027s address-ID, corrupting path-manager id-based bookkeeping (endpoint availability, ADD_ADDR/REMOVE_ADDR matching, and ID-0 primary-path identity). The modification is limited to that protocol ID and is not an arbitrary kernel write or control-flow primitive.\\nA:H - A poisoned local_id of 0 or a colliding endpoint ID makes later REMOVE_ADDR/RMSUBFLOW close the initial or other still-needed subflows via mptcp_close_ssk, and desynchronized PM state can reject further joins or tear down the MPTCP session. An attacker can repeat this against many connections on an internet-facing MPTCP service.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"9466a1ccebbe54ac57fb8a89c2b4b854826546a8\", \"lessThan\": \"4534e0eead692bb069ad1e6a5a245fc2e2078300\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9466a1ccebbe54ac57fb8a89c2b4b854826546a8\", \"lessThan\": \"63cacb05e51a1c6e1349d2e593d00fd6ef43def4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9466a1ccebbe54ac57fb8a89c2b4b854826546a8\", \"lessThan\": \"954b5ea836eb118d188975ced803448537ab8479\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9466a1ccebbe54ac57fb8a89c2b4b854826546a8\", \"lessThan\": \"9df36a4846375a9b75bf42d77bfed216b0f366f9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9466a1ccebbe54ac57fb8a89c2b4b854826546a8\", \"lessThan\": \"64f2c5dd49b956a542c8c02b8dad5d262a462bba\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9466a1ccebbe54ac57fb8a89c2b4b854826546a8\", \"lessThan\": \"51887ccd88791ddaa8755a7c614fda031ecf7982\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9466a1ccebbe54ac57fb8a89c2b4b854826546a8\", \"lessThan\": \"bf19d166337c6488b39cb03eeeffb30a941d6326\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9466a1ccebbe54ac57fb8a89c2b4b854826546a8\", \"lessThan\": \"b878dfdd12d7a5b8722a78d35e313506140ca3d9\", \"versionType\": \"git\"}], \"programFiles\": [\"net/mptcp/syncookies.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.109\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.50\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.2.*\"}, {\"status\": \"unaffected\", \"version\": \"7.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/mptcp/syncookies.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/4534e0eead692bb069ad1e6a5a245fc2e2078300\"}, {\"url\": \"https://git.kernel.org/stable/c/63cacb05e51a1c6e1349d2e593d00fd6ef43def4\"}, {\"url\": \"https://git.kernel.org/stable/c/954b5ea836eb118d188975ced803448537ab8479\"}, {\"url\": \"https://git.kernel.org/stable/c/9df36a4846375a9b75bf42d77bfed216b0f366f9\"}, {\"url\": \"https://git.kernel.org/stable/c/64f2c5dd49b956a542c8c02b8dad5d262a462bba\"}, {\"url\": \"https://git.kernel.org/stable/c/51887ccd88791ddaa8755a7c614fda031ecf7982\"}, {\"url\": \"https://git.kernel.org/stable/c/bf19d166337c6488b39cb03eeeffb30a941d6326\"}, {\"url\": \"https://git.kernel.org/stable/c/b878dfdd12d7a5b8722a78d35e313506140ca3d9\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction\\n\\nmptcp_token_join_cookie_init_state() restores remote_nonce, local_nonce,\\nbackup, join_id, token and msk from the saved cookie entry when rebuilding\\nthe request socket for a MP_JOIN 4th-ACK handled under SYN cookies, but it\\ndoes not restore local_id, even though the SYN path saved it.\\nsubflow_ulp_clone() then reads that uninitialized field and stores it as\\nthe joined subflow\u0027s address-ID. Because the request-sock slab is\\nSLAB_TYPESAFE_BY_RCU and not zeroed on allocation, the value is the stale\\nbyte of a previously freed request socket, which an off-path peer can\\ninfluence by sending concurrent MP_JOIN SYNs. This corrupts the path\\nmanager\u0027s id-based subflow bookkeeping for the connection.\\n\\nRestore subflow_req-\u003elocal_id from the cookie entry, as done for the other\\nfields.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"5.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:48:47.068Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-89554\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:48:47.068Z\", \"dateReserved\": \"2026-09-11T19:38:34.724Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:44:27.586Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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