{
  "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-2026-23247",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-23247",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-03-18T10:05:09.353Z",
    "updatedAt": "2026-10-21T12:39:02.742Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "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": "tcp: secure_seq: add back ports to TS offset",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: secure_seq: add back ports to TS offset\n\nThis reverts 28ee1b746f49 (\"secure_seq: downgrade to per-host timestamp offsets\")\n\ntcp_tw_recycle went away in 2017.\n\nZhouyan Deng reported off-path TCP source port leakage via\nSYN cookie side-channel that can be fixed in multiple ways.\n\nOne of them is to bring back TCP ports in TS offset randomization.\n\nAs a bonus, we perform a single siphash() computation\nto provide both an ISN and a TS offset.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e873e8c16b2fb743a381a9e59c108e63512301ec"
            },
            {
              "version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5da5662181ef8a251e3ba564903002c2e87de452"
            },
            {
              "version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "eae2f14ab2efccdb7480fae7d42c4b0116ef8805"
            },
            {
              "version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "46e5b0d7cf55821527adea471ffe52a5afbd9caf"
            },
            {
              "version": "28ee1b746f493b7c62347d714f58fbf4f70df4f0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "165573e41f2f66ef98940cf65f838b2cb575d9d1"
            },
            {
              "version": "443fac9f2618b93cbc5ab068dc594530236b3a23",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.10.14",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.11"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.11",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.11"
            },
            {
              "version": "6.6.160",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.94",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.17",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "6.19.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}