{
  "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-2025-21993",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21993",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-04-02T12:53:15.513Z",
    "updatedAt": "2026-05-11T21:10:34.056Z",
    "importedAt": "2026-10-24T01:57:29.455Z",
    "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": "iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\niscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()\n\nWhen performing an iSCSI boot using IPv6, iscsistart still reads the\n/sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix\nlength is 64, this causes the shift exponent to become negative,\ntriggering a UBSAN warning. As the concept of a subnet mask does not\napply to IPv6, the value is set to ~0 to suppress the warning message.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "138fe4e069798d9aa948a5402ff15e58f483ee4e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a858cd58dea06cf85b142673deea8c5d87f11e70"
            },
            {
              "version": "138fe4e069798d9aa948a5402ff15e58f483ee4e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f763c82db8166e28f45b7cc4a5398a7859665940"
            },
            {
              "version": "138fe4e069798d9aa948a5402ff15e58f483ee4e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b388e185bfad32bfed6a97a6817f74ca00a4318f"
            },
            {
              "version": "138fe4e069798d9aa948a5402ff15e58f483ee4e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c"
            },
            {
              "version": "138fe4e069798d9aa948a5402ff15e58f483ee4e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d"
            },
            {
              "version": "138fe4e069798d9aa948a5402ff15e58f483ee4e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b253660fac5e0e9080d2c95e3a029e1898d49afb"
            },
            {
              "version": "138fe4e069798d9aa948a5402ff15e58f483ee4e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c1c6e527470e5eab0b2d57bd073530fbace39eab"
            },
            {
              "version": "138fe4e069798d9aa948a5402ff15e58f483ee4e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "07e0d99a2f701123ad3104c0f1a1e66bce74d6e5"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "2.6.26",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "2.6.26"
            },
            {
              "version": "5.4.292",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.236",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.180",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.132",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.84",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.20",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.13.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "version": "6.14",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}