{
  "cveId": "CVE-2021-47343",
  "url": "https://patchblox.com/security/cve/CVE-2021-47343",
  "summary": "CVE-2021-47343 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47343, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  dm btree remove: assign new_root only when remov...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  dm btree remove: assign new_root only when removal succeeds  remove_raw() in dm_btree_remove() may fail due to IO read error (e.g. read the content of origin block fails during shadowing), and the value of shadow_spine::root is uninitialized, but the uninitialized value is still assign to new_root in the end of dm_btree_remove().  For dm-thin, the value of pmd-\u003Edetails_root or pmd-\u003Eroot will become an uninitialized value, so if trying to read details_info tree again out-of-bound memory may occur as showed below:    general protection fault, probably for non-canonical address 0x3fdcb14c8d7520   CPU: 4 PID: 515 Comm: dmsetup Not tainted 5.13.0-rc6   Hardware name: QEMU Standard PC   RIP: 0010:metadata_ll_load_ie\u002B0x14/0x30   Call Trace:    sm_metadata_count_is_more_than_one\u002B0xb9/0xe0    dm_tm_shadow_block\u002B0x52/0x1c0    shadow_step\u002B0x59/0xf0    remove_raw\u002B0xb2/0x170    dm_btree_remove\u002B0xf4/0x1c0    dm_pool_delete_thin_device\u002B0xc3/0x140    pool_message\u002B0x218/0x2b0    target_message\u002B0x251/0x290    ctl_ioctl\u002B0x1c4/0x4d0    dm_ctl_ioctl\u002B0xe/0x20    __x64_sys_ioctl\u002B0x7b/0xb0    do_syscall_64\u002B0x40/0xb0    entry_SYSCALL_64_after_hwframe\u002B0x44/0xae  Fixing it by only assign new_root when removal succeeds",
  "published": "2024-05-21T15:15:20Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0027,
  "epssPercentile": 0.19309,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47343",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47343",
      "released": "2024-05-21T15:15:20Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47343",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47343",
      "released": "2024-05-21T15:15:20Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-47343",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47343",
      "released": "2024-05-21T15:15:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}