{
  "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-2024-50250",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-50250",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-11-09T10:14:59.003Z",
    "updatedAt": "2026-08-05T11:42:46.493Z",
    "importedAt": "2026-10-24T01:57:20.494Z",
    "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": "fsdax: dax_unshare_iter needs to copy entire blocks",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nfsdax: dax_unshare_iter needs to copy entire blocks\n\nThe code that copies data from srcmap to iomap in dax_unshare_iter is\nvery very broken, which bfoster's recent fsx changes have exposed.\n\nIf the pos and len passed to dax_file_unshare are not aligned to an\nfsblock boundary, the iter pos and length in the _iter function will\nreflect this unalignment.\n\ndax_iomap_direct_access always returns a pointer to the start of the\nkmapped fsdax page, even if its pos argument is in the middle of that\npage.  This is catastrophic for data integrity when iter->pos is not\naligned to a page, because daddr/saddr do not point to the same byte in\nthe file as iter->pos.  Hence we corrupt user data by copying it to the\nwrong place.\n\nIf iter->pos + iomap_length() in the _iter function not aligned to a\npage, then we fail to copy a full block, and only partially populate the\ndestination block.  This is catastrophic for data confidentiality\nbecause we expose stale pmem contents.\n\nFix both of these issues by aligning copy_pos/copy_len to a page\nboundary (remember, this is fsdax so 1 fsblock == 1 base page) so that\nwe always copy full blocks.\n\nWe're not done yet -- there's no call to invalidate_inode_pages2_range,\nso programs that have the file range mmap'd will continue accessing the\nold memory mapping after the file metadata updates have completed.\n\nBe careful with the return value -- if the unshare succeeds, we still\nneed to return the number of bytes that the iomap iter thinks we're\noperating on.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1bec6782a25c9b92c203ea7a1b3e3dc6a468cbc4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bdbc96c23197d773a7d1bf03e4f11de593b0ff28"
            },
            {
              "version": "d984648e428bf88cbd94ebe346c73632cb92fffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9bc18bb476e50e32e5d08f2734d63d63e0fa528c"
            },
            {
              "version": "d984648e428bf88cbd94ebe346c73632cb92fffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8e9c0f500b42216ef930f5c0d1703989a451913d"
            },
            {
              "version": "d984648e428bf88cbd94ebe346c73632cb92fffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "50793801fc7f6d08def48754fb0f0706b0cfc394"
            },
            {
              "version": "6.1.113",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.116"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.2",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.2"
            },
            {
              "version": "6.1.116",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.60",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.11.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.11.*"
            },
            {
              "version": "6.12",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}