{
  "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-2025-39681",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-39681",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-09-05T17:20:47.564Z",
    "updatedAt": "2026-10-15T01:07:57.889Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "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": "x86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/cpu/hygon: Add missing resctrl_cpu_detect() in bsp_init helper\n\nSince\n\n  923f3a2b48bd (\"x86/resctrl: Query LLC monitoring properties once during boot\")\n\nresctrl_cpu_detect() has been moved from common CPU initialization code to\nthe vendor-specific BSP init helper, while Hygon didn't put that call in their\ncode.\n\nThis triggers a division by zero fault during early booting stage on our\nmachines with X86_FEATURE_CQM* supported, where get_rdt_mon_resources() tries\nto calculate mon_l3_config with uninitialized boot_cpu_data.x86_cache_occ_scale.\n\nAdd the missing resctrl_cpu_detect() in the Hygon BSP init helper.\n\n  [ bp: Massage commit message. ]",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "62f12cde10118253348a7540e85606869bd69432"
            },
            {
              "version": "923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "873f32201df8876bdb2563e3187e79149427cab4"
            },
            {
              "version": "923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fb81222c1559f89bfe3aa1010f6d112531d55353"
            },
            {
              "version": "923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7207923d8453ebfb35667c1736169f2dd796772e"
            },
            {
              "version": "923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a9e5924daa954c9f585c1ca00358afe71d6781c4"
            },
            {
              "version": "923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d23264c257a70dbe021b43b3bc2ee16134cd2c69"
            },
            {
              "version": "923f3a2b48bdccb6a1d1f0dd48de03de7ad936d9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d8df126349dad855cdfedd6bbf315bad2e901c2f"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.8",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.8"
            },
            {
              "version": "5.10.242",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.190",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.149",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.103",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.44",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.16.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.16.*"
            },
            {
              "version": "6.17",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}