CVE-2025-23145 (GCVE-0-2025-23145)
Vulnerability from cvelistv5
Published
2025-05-01 12:55
Modified
2025-05-26 05:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix NULL pointer in can_accept_new_subflow When testing valkey benchmark tool with MPTCP, the kernel panics in 'mptcp_can_accept_new_subflow' because subflow_req->msk is NULL. Call trace: mptcp_can_accept_new_subflow (./net/mptcp/subflow.c:63 (discriminator 4)) (P) subflow_syn_recv_sock (./net/mptcp/subflow.c:854) tcp_check_req (./net/ipv4/tcp_minisocks.c:863) tcp_v4_rcv (./net/ipv4/tcp_ipv4.c:2268) ip_protocol_deliver_rcu (./net/ipv4/ip_input.c:207) ip_local_deliver_finish (./net/ipv4/ip_input.c:234) ip_local_deliver (./net/ipv4/ip_input.c:254) ip_rcv_finish (./net/ipv4/ip_input.c:449) ... According to the debug log, the same req received two SYN-ACK in a very short time, very likely because the client retransmits the syn ack due to multiple reasons. Even if the packets are transmitted with a relevant time interval, they can be processed by the server on different CPUs concurrently). The 'subflow_req->msk' ownership is transferred to the subflow the first, and there will be a risk of a null pointer dereference here. This patch fixes this issue by moving the 'subflow_req->msk' under the `own_req == true` conditional. Note that the !msk check in subflow_hmac_valid() can be dropped, because the same check already exists under the own_req mpj branch where the code has been moved to.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/443041deb5ef6a1289a99ed95015ec7442f141dc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b2649b9717678aeb097893cc49f59311a1ecab0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f9ae060ed64aef8f174c5f1ea513825b1be9af1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/855bf0aacd51fced11ea9aa0d5101ee0febaeadb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cf7fef1bb2ffea7792bcbf71ca00216cecc725d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3088bd2a6790c8efff139d86d7a9d0b1305977b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc81e41a307df523072186b241fa8244fecd7803
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/efd58a8dd9e7a709a90ee486a4247c923d27296f
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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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix NULL pointer in can_accept_new_subflow\n\nWhen testing valkey benchmark tool with MPTCP, the kernel panics in\n\u0027mptcp_can_accept_new_subflow\u0027 because subflow_req-\u003emsk is NULL.\n\nCall trace:\n\n  mptcp_can_accept_new_subflow (./net/mptcp/subflow.c:63 (discriminator 4)) (P)\n  subflow_syn_recv_sock (./net/mptcp/subflow.c:854)\n  tcp_check_req (./net/ipv4/tcp_minisocks.c:863)\n  tcp_v4_rcv (./net/ipv4/tcp_ipv4.c:2268)\n  ip_protocol_deliver_rcu (./net/ipv4/ip_input.c:207)\n  ip_local_deliver_finish (./net/ipv4/ip_input.c:234)\n  ip_local_deliver (./net/ipv4/ip_input.c:254)\n  ip_rcv_finish (./net/ipv4/ip_input.c:449)\n  ...\n\nAccording to the debug log, the same req received two SYN-ACK in a very\nshort time, very likely because the client retransmits the syn ack due\nto multiple reasons.\n\nEven if the packets are transmitted with a relevant time interval, they\ncan be processed by the server on different CPUs concurrently). The\n\u0027subflow_req-\u003emsk\u0027 ownership is transferred to the subflow the first,\nand there will be a risk of a null pointer dereference here.\n\nThis patch fixes this issue by moving the \u0027subflow_req-\u003emsk\u0027 under the\n`own_req == true` conditional.\n\nNote that the !msk check in subflow_hmac_valid() can be dropped, because\nthe same check already exists under the own_req mpj branch where the\ncode has been moved to."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:19:25.316Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/8cf7fef1bb2ffea7792bcbf71ca00216cecc725d"
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        },
        {
          "url": "https://git.kernel.org/stable/c/443041deb5ef6a1289a99ed95015ec7442f141dc"
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      "title": "mptcp: fix NULL pointer in can_accept_new_subflow",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-23145",
    "datePublished": "2025-05-01T12:55:34.622Z",
    "dateReserved": "2025-01-11T14:28:41.512Z",
    "dateUpdated": "2025-05-26T05:19:25.316Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-23145\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T13:15:50.343\",\"lastModified\":\"2025-05-02T13:53:20.943\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmptcp: fix NULL pointer in can_accept_new_subflow\\n\\nWhen testing valkey benchmark tool with MPTCP, the kernel panics in\\n\u0027mptcp_can_accept_new_subflow\u0027 because subflow_req-\u003emsk is NULL.\\n\\nCall trace:\\n\\n  mptcp_can_accept_new_subflow (./net/mptcp/subflow.c:63 (discriminator 4)) (P)\\n  subflow_syn_recv_sock (./net/mptcp/subflow.c:854)\\n  tcp_check_req (./net/ipv4/tcp_minisocks.c:863)\\n  tcp_v4_rcv (./net/ipv4/tcp_ipv4.c:2268)\\n  ip_protocol_deliver_rcu (./net/ipv4/ip_input.c:207)\\n  ip_local_deliver_finish (./net/ipv4/ip_input.c:234)\\n  ip_local_deliver (./net/ipv4/ip_input.c:254)\\n  ip_rcv_finish (./net/ipv4/ip_input.c:449)\\n  ...\\n\\nAccording to the debug log, the same req received two SYN-ACK in a very\\nshort time, very likely because the client retransmits the syn ack due\\nto multiple reasons.\\n\\nEven if the packets are transmitted with a relevant time interval, they\\ncan be processed by the server on different CPUs concurrently). The\\n\u0027subflow_req-\u003emsk\u0027 ownership is transferred to the subflow the first,\\nand there will be a risk of a null pointer dereference here.\\n\\nThis patch fixes this issue by moving the \u0027subflow_req-\u003emsk\u0027 under the\\n`own_req == true` conditional.\\n\\nNote that the !msk check in subflow_hmac_valid() can be dropped, because\\nthe same check already exists under the own_req mpj branch where the\\ncode has been moved to.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: se corrige el puntero NULL en can_accept_new_subflow Al probar la herramienta de evaluaci\u00f3n comparativa valkey con MPTCP, el kernel entra en p\u00e1nico en \u0027mptcp_can_accept_new_subflow\u0027 porque subflow_req-\u0026gt;msk es NULL. Rastreo de llamadas: mptcp_can_accept_new_subflow (./net/mptcp/subflow.c:63 (discriminador 4)) (P) subflow_syn_recv_sock (./net/mptcp/subflow.c:854) tcp_check_req (./net/ipv4/tcp_minisocks.c:863) tcp_v4_rcv (./net/ipv4/tcp_ipv4.c:2268) ip_protocol_deliver_rcu (./net/ipv4/ip_input.c:207) ip_local_deliver_finish (./net/ipv4/ip_input.c:234) ip_local_deliver (./net/ipv4/ip_input.c:254) ip_rcv_finish (./net/ipv4/ip_input.c:449) ... Seg\u00fan el registro de depuraci\u00f3n, la misma solicitud recibi\u00f3 dos SYN-ACK en muy poco tiempo, probablemente porque el cliente retransmite el SYN-ACK por varias razones. Incluso si los paquetes se transmiten con un intervalo de tiempo relevante, el servidor puede procesarlos en diferentes CPU simult\u00e1neamente. La propiedad de \u0027subflow_req-\u0026gt;msk\u0027 se transfiere primero al subflujo, lo que conlleva el riesgo de una desreferencia de puntero nulo. Este parche corrige este problema moviendo \u0027subflow_req-\u0026gt;msk\u0027 bajo la condici\u00f3n `own_req == true`. Tenga en cuenta que la comprobaci\u00f3n !msk en subflow_hmac_valid() puede omitirse, ya que ya existe en la rama own_req de mpj, donde se ha movido el c\u00f3digo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/443041deb5ef6a1289a99ed95015ec7442f141dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b2649b9717678aeb097893cc49f59311a1ecab0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7f9ae060ed64aef8f174c5f1ea513825b1be9af1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/855bf0aacd51fced11ea9aa0d5101ee0febaeadb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cf7fef1bb2ffea7792bcbf71ca00216cecc725d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3088bd2a6790c8efff139d86d7a9d0b1305977b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc81e41a307df523072186b241fa8244fecd7803\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/efd58a8dd9e7a709a90ee486a4247c923d27296f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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