CVE-2026-98438

{
  "etk_id": "ETK-2026-2033",
  "cve_id": "CVE-2026-98438",
  "display_id": "CVE-2026-98438",
  "ghsa_id": "GHSA-232g-622w-prrg",
  "euvd_id": "EUVD-2026-103677",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Uninitialized value in Linux kernel MPTCP DATA_FIN handling",
  "summary": "Linux kernels with the affected MPTCP option handling can construct a no-data DATA_FIN using uninitialized checksum state. A remote peer able to reach this MPTCP connection state may trigger the flawed path when checksum negotiation is active; the evidence does not specify the resulting security impact.",
  "mitigation": "Upgrade to a Linux kernel release containing the applicable fix commit 9a682067dd7b9dce6b94a0a05661dcc921446402 or b110f1dd6cb6a9930503354a01a315e0a821eaa7. Disable MPTCP where it is not required until updated.",
  "vendor": "Linux",
  "product": "Linux",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= cfcceb7a39fc10a6f896af8229bf81d96acb22cc, < 9a682067dd7b9dce6b94a0a05661dcc921446402",
        ">= cfcceb7a39fc10a6f896af8229bf81d96acb22cc, < b110f1dd6cb6a9930503354a01a315e0a821eaa7"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "9a682067dd7b9dce6b94a0a05661dcc921446402",
        "b110f1dd6cb6a9930503354a01a315e0a821eaa7"
      ],
      "package_name": "Linux",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "7.1"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "Linux",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": null,
  "cvss_src": null,
  "cvss_vector": null,
  "epss_score": 0.0015,
  "epss_percentile": 0.0338,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 102.8911004,
  "t0_at": "2026-10-18T14:45:27.288000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-19T07:28:17.333797+00:00",
      "days": 0.6964125670949074,
      "is_lower_bound": false,
      "measured_at": "2026-10-18T14:45:27.288000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-18T14:45:27.288000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-18T14:45:27.288000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98438"
    }
  }
}