{
  "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-2024-50217",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-50217",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-11-09T10:14:28.798Z",
    "updatedAt": "2026-08-05T11:42:34.683Z",
    "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": "btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()\n\nMounting btrfs from two images (which have the same one fsid and two\ndifferent dev_uuids) in certain executing order may trigger an UAF for\nvariable 'device->bdev_file' in __btrfs_free_extra_devids(). And\nfollowing are the details:\n\n1. Attach image_1 to loop0, attach image_2 to loop1, and scan btrfs\n   devices by ioctl(BTRFS_IOC_SCAN_DEV):\n\n             /  btrfs_device_1 → loop0\n   fs_device\n             \\  btrfs_device_2 → loop1\n2. mount /dev/loop0 /mnt\n   btrfs_open_devices\n    btrfs_device_1->bdev_file = btrfs_get_bdev_and_sb(loop0)\n    btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1)\n   btrfs_fill_super\n    open_ctree\n     fail: btrfs_close_devices // -ENOMEM\n\t    btrfs_close_bdev(btrfs_device_1)\n             fput(btrfs_device_1->bdev_file)\n\t      // btrfs_device_1->bdev_file is freed\n\t    btrfs_close_bdev(btrfs_device_2)\n             fput(btrfs_device_2->bdev_file)\n\n3. mount /dev/loop1 /mnt\n   btrfs_open_devices\n    btrfs_get_bdev_and_sb(&bdev_file)\n     // EIO, btrfs_device_1->bdev_file is not assigned,\n     // which points to a freed memory area\n    btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1)\n   btrfs_fill_super\n    open_ctree\n     btrfs_free_extra_devids\n      if (btrfs_device_1->bdev_file)\n       fput(btrfs_device_1->bdev_file) // UAF !\n\nFix it by setting 'device->bdev_file' as 'NULL' after closing the\nbtrfs_device in btrfs_close_one_device().",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "142388194191a3edc9ba01cfcfd8b691e0971fb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "47a83f8df39545f3f552bb6a1b6d9c30e37621dd"
            },
            {
              "version": "142388194191a3edc9ba01cfcfd8b691e0971fb2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "aec8e6bf839101784f3ef037dcdb9432c3f32343"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.8",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.8"
            },
            {
              "version": "6.11.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.11.*"
            },
            {
              "version": "6.12",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}