{
  "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-2025-21978",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21978",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-04-01T15:47:08.168Z",
    "updatedAt": "2026-05-11T21:10:16.302Z",
    "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": "drm/hyperv: Fix address space leak when Hyper-V DRM device is removed",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/hyperv: Fix address space leak when Hyper-V DRM device is removed\n\nWhen a Hyper-V DRM device is probed, the driver allocates MMIO space for\nthe vram, and maps it cacheable. If the device removed, or in the error\npath for device probing, the MMIO space is released but no unmap is done.\nConsequently the kernel address space for the mapping is leaked.\n\nFix this by adding iounmap() calls in the device removal path, and in the\nerror path during device probing.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "a0ab5abced550ddeefddb06055ed60779a54eb79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c40cd24bfb9bfbb315c118ca14ebe6cf52e2dd1e"
            },
            {
              "version": "a0ab5abced550ddeefddb06055ed60779a54eb79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ad27b4a51495490b815580d9b935e8eee14d1a9c"
            },
            {
              "version": "a0ab5abced550ddeefddb06055ed60779a54eb79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "24f1bbfb2be77dad82489c1468bbb14312aab129"
            },
            {
              "version": "a0ab5abced550ddeefddb06055ed60779a54eb79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "158242b56bf465a73e1edeac0fe828a8acad4499"
            },
            {
              "version": "a0ab5abced550ddeefddb06055ed60779a54eb79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "aed709355fd05ef747e1af24a1d5d78cd7feb81e"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.0"
            },
            {
              "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": "*"
            }
          ]
        }
      ]
    }
  }
}