CVE-2021-47343 (GCVE-0-2021-47343)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2025-12-18 11:37
VLAI?
Title
dm btree remove: assign new_root only when removal succeeds
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
Severity ?
No CVSS data available.
Assigner
References
Impacted 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)
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    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)
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{\"status\": \"affected\", \"version\": \"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4\", \"lessThan\": \"ba47e65a5de3e0e8270301a409fc63d3129fdb9e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4\", \"lessThan\": \"89bf942314b78d454db92427201421b5dec132d9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4\", \"lessThan\": \"ad365e9351ac2b450e7e79932ff6abf59342d91a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4\", \"lessThan\": \"b6e58b5466b2959f83034bead2e2e1395cca8aeb\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/md/persistent-data/dm-btree-remove.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.276\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.276\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.240\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.133\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.51\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.18\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.13.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/md/persistent-data/dm-btree-remove.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc\"}, {\"url\": \"https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5\"}, {\"url\": \"https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3\"}, {\"url\": \"https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5\"}, {\"url\": \"https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851\"}, {\"url\": \"https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e\"}, {\"url\": \"https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9\"}, {\"url\": \"https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a\"}, {\"url\": \"https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.276\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.276\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.240\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.198\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.133\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.51\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.18\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13.3\", \"versionStartIncluding\": \"3.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14\", \"versionStartIncluding\": \"3.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-18T11:37:01.861Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47343\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-18T11:37:01.861Z\", \"dateReserved\": \"2024-05-21T14:28:16.979Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:50.293Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.