Vulnerability-Lookup

FKIE_CVE-2021-47343

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-08-04 10:16

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5	Patch

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	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/persistent-data/dm-btree-remove.c"
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "4.14.240",
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            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.198",
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              "status": "unaffected",
              "version": "5.4.133",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "5.13.3",
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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": "2026-08-04T10:16:58.677",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "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"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47343",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-23T19:04:19.383705Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:20.993",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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CVE-2021-47343 (GCVE-0-2021-47343)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47

Title

dm btree remove: assign new_root only when removal succeeds

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-23 19:04 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7018 records in the last 180 days details

References

9 references

URL	Tags
https://git.kernel.org/stable/c/4c84b3e0728ffe10d…
https://git.kernel.org/stable/c/c154775619186781a…
https://git.kernel.org/stable/c/73f27adaa73e3057a…
https://git.kernel.org/stable/c/8fbae4a1bdb5b8894…
https://git.kernel.org/stable/c/964d57d1962d7e68f…
https://git.kernel.org/stable/c/ba47e65a5de3e0e82…
https://git.kernel.org/stable/c/89bf942314b78d454…
https://git.kernel.org/stable/c/ad365e9351ac2b450…
https://git.kernel.org/stable/c/b6e58b5466b2959f8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < 4c84b3e0728ffe10d89c633694c35a02b5c477dc (git) Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < c154775619186781aaf8a99333ac07437a1768d5 (git) Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < 73f27adaa73e3057a9ec464e33c4f54d34ea5de3 (git) Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < 8fbae4a1bdb5b889490cdee929e68540151536e5 (git) Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < 964d57d1962d7e68f0f578f05d9ae4a104d74851 (git) Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < ba47e65a5de3e0e8270301a409fc63d3129fdb9e (git) Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < 89bf942314b78d454db92427201421b5dec132d9 (git) Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < ad365e9351ac2b450e7e79932ff6abf59342d91a (git) Affected: 3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 , < b6e58b5466b2959f83034bead2e2e1395cca8aeb (git)
Linux	Linux	Affected: 3.2 Unaffected: 0 , < 3.2 (semver) Unaffected: 4.4.276 , ≤ 4.4.* (semver) Unaffected: 4.9.276 , ≤ 4.9.* (semver) Unaffected: 4.14.240 , ≤ 4.14.* (semver) Unaffected: 4.19.198 , ≤ 4.19.* (semver) Unaffected: 5.4.133 , ≤ 5.4.* (semver) Unaffected: 5.10.51 , ≤ 5.10.* (semver) Unaffected: 5.12.18 , ≤ 5.12.* (semver) Unaffected: 5.13.3 , ≤ 5.13.* (semver) Unaffected: 5.14 , ≤ * (original_commit_for_fix)

Show details on NVD website

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To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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