mptcp: fallback earlier on simult connection

{
  "id": "ac50974494c2b8996cb2f06ede7ee79a4b1079140944048aa6b6467e64347023",
  "url": "https://osv.dev/vulnerability/CVE-2025-71088",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mptcp: fallback earlier on simult connection",
    "summary": "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: 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: 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_ip",
    "evidence": "osv:CVE-2025-71088",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.120",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.65",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-71088",
      "aliases": [
        "CVE-2025-71088"
      ],
      "affected": [
        {
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              "type": "GIT",
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                  "fixed": "c9bf315228287653522894df9d851e9b43db9516"
                },
                {
                  "fixed": "79f80a7a47849ef1b3c25a0bedcc448b9cb551c1"
                },
                {
                  "fixed": "25f1ae942c097b7ae4ce5c2b9c6fefb8e3672b86"
                },
                {
                  "fixed": "71154bbe49423128c1c8577b6576de1ed6836830"
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            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.1.110"
                },
                {
                  "fixed": "6.1.160"
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          "versions": [
            "v6.1.159",
            "v6.1.158",
            "v6.1.157",
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            "v6.1.155",
            "v6.1.154",
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            "v6.1.121",
            "v6.1.120",
            "v6.1.119",
            "v6.1.118",
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            "v6.1.114",
            "v6.1.113",
            "v6.1.112",
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71088.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "0"
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            {
              "type": "ECOSYSTEM",
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71088.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.434241328Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
        "https://git.kernel.org/stable/c/25f1ae942c097b7ae4ce5c2b9c6fefb8e3672b86",
        "https://git.kernel.org/stable/c/71154bbe49423128c1c8577b6576de1ed6836830",
        "https://git.kernel.org/stable/c/79f80a7a47849ef1b3c25a0bedcc448b9cb551c1",
        "https://git.kernel.org/stable/c/b5f46a08269265e2f5e87d855287d6d22de0a32b",
        "https://git.kernel.org/stable/c/c9bf315228287653522894df9d851e9b43db9516",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71088.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-71088",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71088.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-71088",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 520136,
  "published_at": "2026-01-13T15:34:50.377+00:00"
}