{
  "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-2026-98621",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98621",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-18T15:19:41.211Z",
    "updatedAt": "2026-10-19T09:22:49.371Z",
    "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": "net: gue: reject invalid REMCSUM offsets",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gue: reject invalid REMCSUM offsets\n\nThe REMCSUM option carries an absolute checksum start and checksum field\noffset. gue_remcsum() passes them to skb_remcsum_process(), whose\npartial path stores offset - start in the u16 skb->csum_offset variable.\nIf offset is less than start, this underflows.\n\nA forwarded packet can retain CHECKSUM_PARTIAL and reach a NETIF_F_HW_CSUM\ndriver which trusts the metadata, leading skb_copy_and_csum_dev() to write\ntwo bytes about 64 KiB beyond the destination buffer.\n\nReject reversed tuples in validate_gue_flags(), after the existing length\nvalidation, so all GUE parsers enforce the ordering in one place.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "fe881ef11cf0220f118816181930494d484c4883",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4b9bc21b2396c396d88dd909caaf73d5be6ff593"
            },
            {
              "version": "fe881ef11cf0220f118816181930494d484c4883",
              "status": "affected",
              "versionType": "git",
              "lessThan": "43efb1f997e976f386aa89716f55870cd2cff9ad"
            },
            {
              "version": "fe881ef11cf0220f118816181930494d484c4883",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1eeec0c51fd5598da44080ed96bbd9880021c28b"
            },
            {
              "version": "fe881ef11cf0220f118816181930494d484c4883",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1d664be4ca49d1696e85239236f4988dfc4653c3"
            },
            {
              "version": "fe881ef11cf0220f118816181930494d484c4883",
              "status": "affected",
              "versionType": "git",
              "lessThan": "97f907203321eee2cc9132d5c9eb47698fb41d35"
            },
            {
              "version": "fe881ef11cf0220f118816181930494d484c4883",
              "status": "affected",
              "versionType": "git",
              "lessThan": "40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f"
            },
            {
              "version": "fe881ef11cf0220f118816181930494d484c4883",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c20f755338ca234e523dfc943719f194dfc1f903"
            },
            {
              "version": "fe881ef11cf0220f118816181930494d484c4883",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2566866fc30965d915d0b52b5c3323b362619f0e"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.0"
            },
            {
              "version": "5.10.271",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.222",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.189",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.158",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.112",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.55",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}