fkie_cve-2021-47343
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-05-12 19:58
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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->details_root or pmd->root 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+0x14/0x30 Call Trace: sm_metadata_count_is_more_than_one+0xb9/0xe0 dm_tm_shadow_block+0x52/0x1c0 shadow_step+0x59/0xf0 remove_raw+0xb2/0x170 dm_btree_remove+0xf4/0x1c0 dm_pool_delete_thin_device+0xc3/0x140 pool_message+0x218/0x2b0 target_message+0x251/0x290 ctl_ioctl+0x1c4/0x4d0 dm_ctl_ioctl+0xe/0x20 __x64_sys_ioctl+0x7b/0xb0 do_syscall_64+0x40/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae Fixing it by only assign new_root when removal succeeds
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aebPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dcPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aebPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
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          "negate": false,
          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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-\u003edetails_root or pmd-\u003eroot 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"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm btree remove: asigna new_root solo cuando la eliminaci\u00f3n se realiza correctamente. remove_raw() en dm_btree_remove() puede fallar debido a un error de lectura de E/S (por ejemplo, la lectura del contenido del bloque de origen falla durante el sombreado), y el valor de shadow_spine::root no est\u00e1 inicializado, pero el valor no inicializado a\u00fan se asigna a new_root al final de dm_btree_remove(). Para dm-thin, el valor de pmd-\u0026gt;details_root o pmd-\u0026gt;root se convertir\u00e1 en un valor no inicializado, por lo que si intenta leer el \u00e1rbol de detalles_info nuevamente, puede ocurrir que la memoria est\u00e9 fuera de los l\u00edmites, como se muestra a continuaci\u00f3n: falla de protecci\u00f3n general, probablemente para no usuarios. -direcci\u00f3n can\u00f3nica 0x3fdcb14c8d7520 CPU: 4 PID: 515 Comm: dmsetup No contaminado 5.13.0-rc6 Nombre de hardware: QEMU PC est\u00e1ndar RIP: 0010:metadata_ll_load_ie+0x14/0x30 Seguimiento de llamadas: sm_metadata_count_is_more_than_one+0xb9/0xe0 m_shadow_block+0x52/0x1c0 sombra_paso+ 0x59/0xf0 remove_raw+0xb2/0x170 dm_btree_remove+0xf4/0x1c0 dm_pool_delete_thin_device+0xc3/0x140 pool_message+0x218/0x2b0 target_message+0x251/0x290 ctl_ioctl+0x1c4/0x4d0 _ctl_ioctl+0xe/0x20 __x64_sys_ioctl+0x7b/0xb0 do_syscall_64+0x40/0xb0 entrada_SYSCALL_64_after_hwframe+ 0x44/0xae Se soluciona asignando new_root \u00fanicamente cuando la eliminaci\u00f3n se realiza correctamente"
    }
  ],
  "id": "CVE-2021-47343",
  "lastModified": "2025-05-12T19:58:09.607",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-05-21T15:15:20.993",
  "references": [
    {
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1188"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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