{
  "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-2026-46107",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-46107",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-05-28T09:35:13.051Z",
    "updatedAt": "2026-10-19T19:26:43.751Z",
    "importedAt": "2026-10-24T01:58:14.884Z",
    "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": "dm-thin: fix metadata refcount underflow",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-thin: fix metadata refcount underflow\n\nThere's a bug in dm-thin in the function rebalance_children. If the\ninternal btree node has one entry, the code tries to copy all btree\nentries from the node's child to the node itself and then decrement the\nchild's reference count.\n\nIf the child node is shared (it has reference count > 1), we won't free\nit, so there would be two pointers to each of the grandchildren nodes.\nBut the reference counts of the grandchildren is not increased, thus the\nreference count doesn't match the number of pointers that point to the\ngrandchildren. This results in \"device mapper: space map common: unable\nto decrement block\" errors.\n\nFix this bug by incrementing reference counts on the grandchildren if the\nbtree node is shared.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b719d12cb94df345e9ad2715fd0abe9afcaeb111"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f49b41c9eb7c6ff00df27cd49cea210abbadd8ad"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f06f6aededd792a754cd677c02b3d3016d868c2c"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "12161e03d33afce781f68fa11cc6060538862fad"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "323d252a4a378834e4fe68298ca61cfc5dd3a460"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "85311a585a26640760cd0f3349ab9f2905691044"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5ec0debbcfd43596e32c1239e993de06a704e04c"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "09a65adc7d8bbfce06392cb6d375468e2728ead5"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.2",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.2"
            },
            {
              "version": "5.10.259",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.209",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.175",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.140",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.88",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.30",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}