{
  "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-2021-47343",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47343",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-21T14:35:50.293Z",
    "updatedAt": "2026-08-05T08:47:20.543Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "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 btree remove: assign new_root only when removal succeeds",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm btree remove: assign new_root only when removal succeeds\n\nremove_raw() in dm_btree_remove() may fail due to IO read error\n(e.g. read the content of origin block fails during shadowing),\nand the value of shadow_spine::root is uninitialized, but\nthe uninitialized value is still assign to new_root in the\nend of dm_btree_remove().\n\nFor dm-thin, the value of pmd->details_root or pmd->root will become\nan uninitialized value, so if trying to read details_info tree again\nout-of-bound memory may occur as showed below:\n\n  general protection fault, probably for non-canonical address 0x3fdcb14c8d7520\n  CPU: 4 PID: 515 Comm: dmsetup Not tainted 5.13.0-rc6\n  Hardware name: QEMU Standard PC\n  RIP: 0010:metadata_ll_load_ie+0x14/0x30\n  Call Trace:\n   sm_metadata_count_is_more_than_one+0xb9/0xe0\n   dm_tm_shadow_block+0x52/0x1c0\n   shadow_step+0x59/0xf0\n   remove_raw+0xb2/0x170\n   dm_btree_remove+0xf4/0x1c0\n   dm_pool_delete_thin_device+0xc3/0x140\n   pool_message+0x218/0x2b0\n   target_message+0x251/0x290\n   ctl_ioctl+0x1c4/0x4d0\n   dm_ctl_ioctl+0xe/0x20\n   __x64_sys_ioctl+0x7b/0xb0\n   do_syscall_64+0x40/0xb0\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nFixing it by only assign new_root when removal succeeds",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4c84b3e0728ffe10d89c633694c35a02b5c477dc"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c154775619186781aaf8a99333ac07437a1768d5"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "73f27adaa73e3057a9ec464e33c4f54d34ea5de3"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8fbae4a1bdb5b889490cdee929e68540151536e5"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "964d57d1962d7e68f0f578f05d9ae4a104d74851"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ba47e65a5de3e0e8270301a409fc63d3129fdb9e"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "89bf942314b78d454db92427201421b5dec132d9"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ad365e9351ac2b450e7e79932ff6abf59342d91a"
            },
            {
              "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b6e58b5466b2959f83034bead2e2e1395cca8aeb"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.2",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.2"
            },
            {
              "version": "4.4.276",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.4.*"
            },
            {
              "version": "4.9.276",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.9.*"
            },
            {
              "version": "4.14.240",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.198",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.133",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.51",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.12.18",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.12.*"
            },
            {
              "version": "5.13.3",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.13.*"
            },
            {
              "version": "5.14",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}