{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-98438",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98438",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-18T14:45:27.288Z",
    "updatedAt": "2026-10-19T09:19:34.132Z",
    "importedAt": "2026-10-24T01:58:41.756Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "mptcp: options: fix uninit-value in mptcp_write_data_fin",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: options: fix uninit-value in mptcp_write_data_fin\n\nWhen sending a DATA_FIN without data, and because the DATA_FIN occupies\n1 octet of the connection-level sequence space [1], it is then required\nto add a DSS mapping with specific values.\n\nIf the checksum has been negotiated, it also needs to be computed, and\nincluded in the outgoing packet, and thus the initial csum data needs to\nbe reset to 0 as well. This is no longer the case since commit\ncfcceb7a39fc (\"tcp: shrink per-packet memset in __tcp_transmit_skb()\"),\nbecause the whole ext_copy structure is no longer zeroed by default.\n\nThis seems to be the only case where use_map is changed and set\nafterwards, so initialising the csum field only in this case, along with\nother fields for this specific case.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "cfcceb7a39fc10a6f896af8229bf81d96acb22cc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9a682067dd7b9dce6b94a0a05661dcc921446402"
            },
            {
              "version": "cfcceb7a39fc10a6f896af8229bf81d96acb22cc",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b110f1dd6cb6a9930503354a01a315e0a821eaa7"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "7.1",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "7.1"
            },
            {
              "version": "7.2.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}