CVE-2025-71144

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

mptcp: ensure context reset on disconnect()

After the blamed commit below, if the MPC subflow is already in TCP_CLOSE status or has fallback to TCP at mptcp_disconnect() time, mptcp_do_fastclose() skips setting the `send_fastclose flag` and the later __mptcp_close_ssk() does not reset anymore the related subflow context.

Any later connection will be created with both the `request_mptcp` flag and the msk-level fallback status off (it is unconditionally cleared at MPTCP disconnect time), leading to a warning in subflow_data_ready():

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Address the issue setting an explicit `fastclosing` flag at fastclose time, and checking such flag after mptcp_do_fastclose().

Detalles técnicos trazas, registros y código del informe original

  WARNING: CPU: 26 PID: 8996 at net/mptcp/subflow.c:1519 subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))
  Modules linked in:
  CPU: 26 UID: 0 PID: 8996 Comm: syz.22.39 Not tainted 6.18.0-rc7-05427-g11fc074f6c36 #1 PREEMPT(voluntary)
  Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
  RIP: 0010:subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))
  Code: 90 0f 0b 90 90 e9 04 fe ff ff e8 b7 1e f5 fe 89 ee bf 07 00 00 00 e8 db 19 f5 fe 83 fd 07 0f 84 35 ff ff ff e8 9d 1e f5 fe 90 <0f> 0b 90 e9 27 ff ff ff e8 8f 1e f5 fe 4c 89 e7 48 89 de e8 14 09
  RSP: 0018:ffffc9002646fb30 EFLAGS: 00010293
  RAX: 0000000000000000 RBX: ffff88813b218000 RCX: ffffffff825c8435
  RDX: ffff8881300b3580 RSI: ffffffff825c8443 RDI: 0000000000000005
  RBP: 000000000000000b R08: ffffffff825c8435 R09: 000000000000000b
  R10: 0000000000000005 R11: 0000000000000007 R12: ffff888131ac0000
  R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
  FS:  00007f88330af6c0(0000) GS:ffff888a93dd2000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007f88330aefe8 CR3: 000000010ff59000 CR4: 0000000000350ef0
  Call Trace:
   <TASK>
   tcp_data_ready (net/ipv4/tcp_input.c:5356)
   tcp_data_queue (net/ipv4/tcp_input.c:5445)
   tcp_rcv_state_process (net/ipv4/tcp_input.c:7165)
   tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1955)
   __release_sock (include/net/sock.h:1158 (discriminator 6) net/core/sock.c:3180 (discriminator 6))
   release_sock (net/core/sock.c:3737)
   mptcp_sendmsg (net/mptcp/protocol.c:1763 net/mptcp/protocol.c:1857)
   inet_sendmsg (net/ipv4/af_inet.c:853 (discriminator 7))
   __sys_sendto (net/socket.c:727 (discriminator 15) net/socket.c:742 (discriminator 15) net/socket.c:2244 (discriminator 15))
   __x64_sys_sendto (net/socket.c:2247)
   do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
  RIP: 0033:0x7f883326702d

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.13%
Percentil entre todas las CVEs puntuadas: 2
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-71144",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
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              "version": "6.17.10",
              "lessThan": "6.18",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/mptcp/protocol.c",
            "net/mptcp/protocol.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "version": "6.18"
            },
            {
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              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver"
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            {
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              "version": "6.1.164",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
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              "versionType": "semver",
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            },
            {
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              "version": "6.12.65",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
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              "version": "6.18.5",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/mptcp/protocol.c",
            "net/mptcp/protocol.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-01-14T15:16:04.223",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1c7c3a9314d8a7fc0e9a508606466a967c8e774a",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/226fff52e7ed9fc8cd63327133739b3d92537ffd",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5c7c7135468f3fc6379cde9777a2c18bfe92d82f",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/86730ac255b0497a272704de9a1df559f5d6602e",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f1a77dfc3b045c3dd5f6e64189b9f52b90399f07",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure context reset on disconnect()\n\nAfter the blamed commit below, if the MPC subflow is already in TCP_CLOSE\nstatus or has fallback to TCP at mptcp_disconnect() time,\nmptcp_do_fastclose() skips setting the `send_fastclose flag` and the later\n__mptcp_close_ssk() does not reset anymore the related subflow context.\n\nAny later connection will be created with both the `request_mptcp` flag\nand the msk-level fallback status off (it is unconditionally cleared at\nMPTCP disconnect time), leading to a warning in subflow_data_ready():\n\n  WARNING: CPU: 26 PID: 8996 at net/mptcp/subflow.c:1519 subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\n  Modules linked in:\n  CPU: 26 UID: 0 PID: 8996 Comm: syz.22.39 Not tainted 6.18.0-rc7-05427-g11fc074f6c36 #1 PREEMPT(voluntary)\n  Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n  RIP: 0010:subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\n  Code: 90 0f 0b 90 90 e9 04 fe ff ff e8 b7 1e f5 fe 89 ee bf 07 00 00 00 e8 db 19 f5 fe 83 fd 07 0f 84 35 ff ff ff e8 9d 1e f5 fe 90 <0f> 0b 90 e9 27 ff ff ff e8 8f 1e f5 fe 4c 89 e7 48 89 de e8 14 09\n  RSP: 0018:ffffc9002646fb30 EFLAGS: 00010293\n  RAX: 0000000000000000 RBX: ffff88813b218000 RCX: ffffffff825c8435\n  RDX: ffff8881300b3580 RSI: ffffffff825c8443 RDI: 0000000000000005\n  RBP: 000000000000000b R08: ffffffff825c8435 R09: 000000000000000b\n  R10: 0000000000000005 R11: 0000000000000007 R12: ffff888131ac0000\n  R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n  FS:  00007f88330af6c0(0000) GS:ffff888a93dd2000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f88330aefe8 CR3: 000000010ff59000 CR4: 0000000000350ef0\n  Call Trace:\n   <TASK>\n   tcp_data_ready (net/ipv4/tcp_input.c:5356)\n   tcp_data_queue (net/ipv4/tcp_input.c:5445)\n   tcp_rcv_state_process (net/ipv4/tcp_input.c:7165)\n   tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1955)\n   __release_sock (include/net/sock.h:1158 (discriminator 6) net/core/sock.c:3180 (discriminator 6))\n   release_sock (net/core/sock.c:3737)\n   mptcp_sendmsg (net/mptcp/protocol.c:1763 net/mptcp/protocol.c:1857)\n   inet_sendmsg (net/ipv4/af_inet.c:853 (discriminator 7))\n   __sys_sendto (net/socket.c:727 (discriminator 15) net/socket.c:742 (discriminator 15) net/socket.c:2244 (discriminator 15))\n   __x64_sys_sendto (net/socket.c:2247)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n  RIP: 0033:0x7f883326702d\n\nAddress the issue setting an explicit `fastclosing` flag at fastclose\ntime, and checking such flag after mptcp_do_fastclose()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmptcp: asegurar el restablecimiento del contexto en disconnect()\n\nDespués del commit culpado a continuación, si el subflujo MPC ya está en estado TCP_CLOSE o ha recurrido a TCP en el momento de mptcp_disconnect(), mptcp_do_fastclose() omite establecer la bandera 'send_fastclose' y el posterior __mptcp_close_ssk() ya no restablece el contexto del subflujo relacionado.\n\nCualquier conexión posterior se creará con la bandera 'request_mptcp' y el estado de recurso a nivel msk desactivado (se borra incondicionalmente en el momento de la desconexión MPTCP), lo que lleva a una advertencia en subflow_data_ready():\n\n  WARNING: CPU: 26 PID: 8996 at net/mptcp/subflow.c:1519 subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\n  Modules linked in:\n  CPU: 26 UID: 0 PID: 8996 Comm: syz.22.39 Not tainted 6.18.0-rc7-05427-g11fc074f6c36 #1 PREEMPT(voluntary)\n  Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011\n  RIP: 0010:subflow_data_ready (net/mptcp/subflow.c:1519 (discriminator 13))\n  Code: 90 0f 0b 90 90 e9 04 fe ff ff e8 b7 1e f5 fe 89 ee bf 07 00 00 00 e8 db 19 f5 fe 83 fd 07 0f 84 35 ff ff ff e8 9d 1e f5 fe 90 &lt;0f&gt; 0b 90 e9 27 ff ff ff e8 8f 1e f5 fe 4c 89 e7 48 89 de e8 14 09\n  RSP: 0018:ffffc9002646fb30 EFLAGS: 00010293\n  RAX: 0000000000000000 RBX: ffff88813b218000 RCX: ffffffff825c8435\n  RDX: ffff8881300b3580 RSI: ffffffff825c8443 RDI: 0000000000000005\n  RBP: 000000000000000b R08: ffffffff825c8435 R09: 000000000000000b\n  R10: 0000000000000005 R11: 0000000000000007 R12: ffff888131ac0000\n  R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n  FS:  00007f88330af6c0(0000) GS:ffff888a93dd2000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f88330aefe8 CR3: 000000010ff59000 CR4: 0000000000350ef0\n  Call Trace:\n   \n   tcp_data_ready (net/ipv4/tcp_input.c:5356)\n   tcp_data_queue (net/ipv4/tcp_input.c:5445)\n   tcp_rcv_state_process (net/ipv4/tcp_input.c:7165)\n   tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1955)\n   __release_sock (include/net/sock.h:1158 (discriminator 6) net/core/sock.c:3180 (discriminator 6))\n   release_sock (net/core/sock.c:3737)\n   mptcp_sendmsg (net/mptcp/protocol.c:1763 net/mptcp/protocol.c:1857)\n   inet_sendmsg (net/ipv4/af_inet.c:853 (discriminator 7))\n   __sys_sendto (net/socket.c:727 (discriminator 15) net/socket.c:742 (discriminator 15) net/socket.c:2244 (discriminator 15))\n   __x64_sys_sendto (net/socket.c:2247)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n   entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n  RIP: 0033:0x7f883326702d\n\nAbordar el problema estableciendo una bandera 'fastclosing' explícita en el momento de fastclose, y verificando dicha bandera después de mptcp_do_fastclose()."
    }
  ],
  "lastModified": "2026-06-17T10:03:45.163",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndExcluding": "6.1.164",
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            {
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              "vulnerable": true,
              "matchCriteriaId": "DA8B3A36-C658-4562-AA47-7FD1228380DA",
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              "matchCriteriaId": "AC4D9A16-72F2-4CA3-A8F5-80DD12FD7626",
              "versionEndExcluding": "6.18",
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              "matchCriteriaId": "FC10B9C3-37AA-4674-94E9-42060AD7B02E",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}