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CVE-2025-71088

Estado: ModificadaMedia (5.5)—

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

mptcp: fallback earlier on simult connection

Syzkaller reports a simult-connect race leading to inconsistent fallback status:

The TCP subflow can process the simult-connect syn-ack packet after transitioning to TCP_FIN1 state, bypassing the MPTCP fallback check, as the sk_state_change() callback is not invoked for * -> FIN_WAIT1 transitions.

That will move the msk socket to an inconsistent status and the next incoming data will hit the reported splat.

Close the race moving the simult-fallback check at the earliest possible stage - that is at syn-ack generation time.

Leer descripción completaMostrar menos

About the fixes tags: [2] was supposed to also fix this issue introduced by [3]. [1] is required as a dependence: it was not explicitly marked as a fix, but it is one and it has already been backported before [3]. In other words, this commit should be backported up to [3], including [2] and [1] if that's not already there.

Detalles técnicos trazas, registros y código del informe original
  WARNING: CPU: 3 PID: 33 at net/mptcp/subflow.c:1515 subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1515
  Modules linked in:
  CPU: 3 UID: 0 PID: 33 Comm: ksoftirqd/3 Not tainted syzkaller #0 PREEMPT(full)
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
  RIP: 0010:subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1515
  Code: 89 ee e8 78 61 3c f6 40 84 ed 75 21 e8 8e 66 3c f6 44 89 fe bf 07 00 00 00 e8 c1 61 3c f6 41 83 ff 07 74 09 e8 76 66 3c f6 90 <0f> 0b 90 e8 6d 66 3c f6 48 89 df e8 e5 ad ff ff 31 ff 89 c5 89 c6
  RSP: 0018:ffffc900006cf338 EFLAGS: 00010246
  RAX: 0000000000000000 RBX: ffff888031acd100 RCX: ffffffff8b7f2abf
  RDX: ffff88801e6ea440 RSI: ffffffff8b7f2aca RDI: 0000000000000005
  RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007
  R10: 0000000000000004 R11: 0000000000002c10 R12: ffff88802ba69900
  R13: 1ffff920000d9e67 R14: ffff888046f81800 R15: 0000000000000004
  FS:  0000000000000000(0000) GS:ffff8880d69bc000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000560fc0ca1670 CR3: 0000000032c3a000 CR4: 0000000000352ef0
  Call Trace:
   <TASK>
   tcp_data_queue+0x13b0/0x4f90 net/ipv4/tcp_input.c:5197
   tcp_rcv_state_process+0xfdf/0x4ec0 net/ipv4/tcp_input.c:6922
   tcp_v6_do_rcv+0x492/0x1740 net/ipv6/tcp_ipv6.c:1672
   tcp_v6_rcv+0x2976/0x41e0 net/ipv6/tcp_ipv6.c:1918
   ip6_protocol_deliver_rcu+0x188/0x1520 net/ipv6/ip6_input.c:438
   ip6_input_finish+0x1e4/0x4b0 net/ipv6/ip6_input.c:489
   NF_HOOK include/linux/netfilter.h:318 [inline]
   NF_HOOK include/linux/netfilter.h:312 [inline]
   ip6_input+0x105/0x2f0 net/ipv6/ip6_input.c:500
   dst_input include/net/dst.h:471 [inline]
   ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
   NF_HOOK include/linux/netfilter.h:318 [inline]
   NF_HOOK include/linux/netfilter.h:312 [inline]
   ipv6_rcv+0x264/0x650 net/ipv6/ip6_input.c:311
   __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:5979
   __netif_receive_skb+0x1d/0x160 net/core/dev.c:6092
   process_backlog+0x442/0x15e0 net/core/dev.c:6444
   __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7494
   napi_poll net/core/dev.c:7557 [inline]
   net_rx_action+0xa9f/0xfe0 net/core/dev.c:7684
   handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
   run_ksoftirqd kernel/softirq.c:968 [inline]
   run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960
   smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160
   kthread+0x3c2/0x780 kernel/kthread.c:463
   ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   </TASK>

CVSS

Probabilidad de explotación (EPSS)

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)

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-71088",
  "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
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "01b7822700f2256900089e00390e119e1ad545df",
              "lessThan": "b5f46a08269265e2f5e87d855287d6d22de0a32b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1e777f39b4d75e599a3aac8e0f67d739474f198c",
              "lessThan": "c9bf315228287653522894df9d851e9b43db9516",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1e777f39b4d75e599a3aac8e0f67d739474f198c",
              "lessThan": "79f80a7a47849ef1b3c25a0bedcc448b9cb551c1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1e777f39b4d75e599a3aac8e0f67d739474f198c",
              "lessThan": "25f1ae942c097b7ae4ce5c2b9c6fefb8e3672b86",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1e777f39b4d75e599a3aac8e0f67d739474f198c",
              "lessThan": "71154bbe49423128c1c8577b6576de1ed6836830",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.1.110",
              "lessThan": "6.1.160",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/mptcp/options.c",
            "net/mptcp/protocol.h",
            "net/mptcp/subflow.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.65",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/mptcp/options.c",
            "net/mptcp/protocol.h",
            "net/mptcp/subflow.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "affectedData": [
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        },
        {
          "vendor": "Siemens",
          "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
          "versions": [
            {
              "status": "affected",
              "version": "V3.1.6",
              "lessThan": "*",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
    }
  ],
  "published": "2026-01-13T16:16:08.460",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/25f1ae942c097b7ae4ce5c2b9c6fefb8e3672b86",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/71154bbe49423128c1c8577b6576de1ed6836830",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/79f80a7a47849ef1b3c25a0bedcc448b9cb551c1",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b5f46a08269265e2f5e87d855287d6d22de0a32b",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c9bf315228287653522894df9d851e9b43db9516",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
  "vulnStatus": "Modified",
  "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: fallback earlier on simult connection\n\nSyzkaller reports a simult-connect race leading to inconsistent fallback\nstatus:\n\n  WARNING: CPU: 3 PID: 33 at net/mptcp/subflow.c:1515 subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1515\n  Modules linked in:\n  CPU: 3 UID: 0 PID: 33 Comm: ksoftirqd/3 Not tainted syzkaller #0 PREEMPT(full)\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\n  RIP: 0010:subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1515\n  Code: 89 ee e8 78 61 3c f6 40 84 ed 75 21 e8 8e 66 3c f6 44 89 fe bf 07 00 00 00 e8 c1 61 3c f6 41 83 ff 07 74 09 e8 76 66 3c f6 90 <0f> 0b 90 e8 6d 66 3c f6 48 89 df e8 e5 ad ff ff 31 ff 89 c5 89 c6\n  RSP: 0018:ffffc900006cf338 EFLAGS: 00010246\n  RAX: 0000000000000000 RBX: ffff888031acd100 RCX: ffffffff8b7f2abf\n  RDX: ffff88801e6ea440 RSI: ffffffff8b7f2aca RDI: 0000000000000005\n  RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007\n  R10: 0000000000000004 R11: 0000000000002c10 R12: ffff88802ba69900\n  R13: 1ffff920000d9e67 R14: ffff888046f81800 R15: 0000000000000004\n  FS:  0000000000000000(0000) GS:ffff8880d69bc000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000560fc0ca1670 CR3: 0000000032c3a000 CR4: 0000000000352ef0\n  Call Trace:\n   <TASK>\n   tcp_data_queue+0x13b0/0x4f90 net/ipv4/tcp_input.c:5197\n   tcp_rcv_state_process+0xfdf/0x4ec0 net/ipv4/tcp_input.c:6922\n   tcp_v6_do_rcv+0x492/0x1740 net/ipv6/tcp_ipv6.c:1672\n   tcp_v6_rcv+0x2976/0x41e0 net/ipv6/tcp_ipv6.c:1918\n   ip6_protocol_deliver_rcu+0x188/0x1520 net/ipv6/ip6_input.c:438\n   ip6_input_finish+0x1e4/0x4b0 net/ipv6/ip6_input.c:489\n   NF_HOOK include/linux/netfilter.h:318 [inline]\n   NF_HOOK include/linux/netfilter.h:312 [inline]\n   ip6_input+0x105/0x2f0 net/ipv6/ip6_input.c:500\n   dst_input include/net/dst.h:471 [inline]\n   ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]\n   NF_HOOK include/linux/netfilter.h:318 [inline]\n   NF_HOOK include/linux/netfilter.h:312 [inline]\n   ipv6_rcv+0x264/0x650 net/ipv6/ip6_input.c:311\n   __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:5979\n   __netif_receive_skb+0x1d/0x160 net/core/dev.c:6092\n   process_backlog+0x442/0x15e0 net/core/dev.c:6444\n   __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7494\n   napi_poll net/core/dev.c:7557 [inline]\n   net_rx_action+0xa9f/0xfe0 net/core/dev.c:7684\n   handle_softirqs+0x216/0x8e0 kernel/softirq.c:579\n   run_ksoftirqd kernel/softirq.c:968 [inline]\n   run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960\n   smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160\n   kthread+0x3c2/0x780 kernel/kthread.c:463\n   ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n   </TASK>\n\nThe TCP subflow can process the simult-connect syn-ack packet after\ntransitioning to TCP_FIN1 state, bypassing the MPTCP fallback check,\nas the sk_state_change() callback is not invoked for * -> FIN_WAIT1\ntransitions.\n\nThat will move the msk socket to an inconsistent status and the next\nincoming data will hit the reported splat.\n\nClose the race moving the simult-fallback check at the earliest possible\nstage - that is at syn-ack generation time.\n\nAbout the fixes tags: [2] was supposed to also fix this issue introduced\nby [3]. [1] is required as a dependence: it was not explicitly marked as\na fix, but it is one and it has already been backported before [3]. In\nother words, this commit should be backported up to [3], including [2]\nand [1] if that's not already there."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmptcp: retroceso más temprano en conexión simultánea\n\nSyzkaller informa una condición de carrera de conexión simultánea que lleva a un estado de retroceso inconsistente:\n\n  WARNING: CPU: 3 PID: 33 at net/mptcp/subflow.c:1515 subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1515\n  Modules linked in:\n  CPU: 3 UID: 0 PID: 33 Comm: ksoftirqd/3 Not tainted syzkaller #0 PREEMPT(full)\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\n  RIP: 0010:subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1515\n  Code: 89 ee e8 78 61 3c f6 40 84 ed 75 21 e8 8e 66 3c f6 44 89 fe bf 07 00 00 00 e8 c1 61 3c f6 41 83 ff 07 74 09 e8 76 66 3c f6 90 &lt;0f&gt; 0b 90 e8 6d 66 3c f6 48 89 df e8 e5 ad ff ff 31 ff 89 c5 89 c6\n  RSP: 0018:ffffc900006cf338 EFLAGS: 00010246\n  RAX: 0000000000000000 RBX: ffff888031acd100 RCX: ffffffff8b7f2abf\n  RDX: ffff88801e6ea440 RSI: ffffffff8b7f2aca RDI: 0000000000000005\n  RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007\n  R10: 0000000000000004 R11: 0000000000002c10 R12: ffff88802ba69900\n  R13: 1ffff920000d9e67 R14: ffff888046f81800 R15: 0000000000000004\n  FS:  0000000000000000(0000) GS:ffff8880d69bc000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000560fc0ca1670 CR3: 0000000032c3a000 CR4: 0000000000352ef0\n  Call Trace:\n   \n   tcp_data_queue+0x13b0/0x4f90 net/ipv4/tcp_input.c:5197\n   tcp_rcv_state_process+0xfdf/0x4ec0 net/ipv4/tcp_input.c:6922\n   tcp_v6_do_rcv+0x492/0x1740 net/ipv6/tcp_ipv6.c:1672\n   tcp_v6_rcv+0x2976/0x41e0 net/ipv6/tcp_ipv6.c:1918\n   ip6_protocol_deliver_rcu+0x188/0x1520 net/ipv6/ip6_input.c:438\n   ip6_input_finish+0x1e4/0x4b0 net/ipv6/ip6_input.c:489\n   NF_HOOK include/linux/netfilter.h:318 [inline]\n   NF_HOOK include/linux/netfilter.h:312 [inline]\n   ip6_input+0x105/0x2f0 net/ipv6/ip6_input.c:500\n   dst_input include/net/dst.h:471 [inline]\n   ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]\n   NF_HOOK include/linux/netfilter.h:318 [inline]\n   NF_HOOK include/linux/netfilter.h:312 [inline]\n   ipv6_rcv+0x264/0x650 net/ipv6/ip6_input.c:311\n   __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:5979\n   __netif_receive_skb+0x1d/0x160 net/core/dev.c:6092\n   process_backlog+0x442/0x15e0 net/core/dev.c:6444\n   __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7494\n   napi_poll net/core/dev.c:7557 [inline]\n   net_rx_action+0xa9f/0xfe0 net/core/dev.c:7684\n   handle_softirqs+0x216/0x8e0 kernel/softirq.c:579\n   run_ksoftirqd kernel/softirq.c:968 [inline]\n   run_ksoftirqd+0x3a/0x60 kernel/softirq.c:960\n   smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160\n   kthread+0x3c2/0x780 kernel/kthread.c:463\n   ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n   \n\nEl subflujo TCP puede procesar el paquete syn-ack de conexión simultánea después de la transición al estado TCP_FIN1, evitando la verificación de retroceso de MPTCP, ya que la devolución de llamada sk_state_change() no se invoca para transiciones de * -&gt; FIN_WAIT1.\n\nEso moverá el socket msk a un estado inconsistente y los próximos datos entrantes alcanzarán el splat reportado.\n\nCerrar la condición de carrera moviendo la verificación de retroceso simultáneo en la etapa más temprana posible, es decir, en el momento de la generación del syn-ack.\n\nSobre las etiquetas de correcciones: [2] se suponía que también corregiría este problema introducido por [3]. [1] es requerido como dependencia: no fue marcado explícitamente como una corrección, pero lo es y ya ha sido retroportado antes de [3]. En otras palabras, este commit debería ser retroportado hasta [3], incluyendo [2] y [1] si aún no están allí."
    }
  ],
  "lastModified": "2026-07-14T13:18:02.440",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3A2EC30B-B7D2-46B0-91A5-0A8420BC52CE",
              "versionEndExcluding": "6.1.160",
              "versionStartIncluding": "6.1.110"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "528CCBAC-105D-4B7E-B115-EAB6707955CF",
              "versionEndExcluding": "6.6.120",
              "versionStartIncluding": "6.2.1"
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