CVE-2021-47343

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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"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reached only through local device-mapper operations\u2014dmsetup ioctls on /dev/mapper/control (pool message \u2192 delete/create) or local block I/O/discard on a dm-thin volume that calls dm_thin_remove_range \u2192 dm_btree_remove\u2014not via network packet processing.\nAC:L - An attacker can reliably force the first shadow_step to fail (leaving spine.root uninitialized) by exhausting metadata space so dm_sm_new_block returns -ENOSPC during discard/remove, or\u2014on the admin path\u2014by placing dm-flakey under the metadata device; neither depends on a race or layout outside attacker influence.\nPR:L - Although the dmsetup path requires capable(CAP_SYS_ADMIN), dm_btree_remove is also reachable from unprivileged discard/write I/O on a thin volume via dm_thin_remove_range/__remove_range with no capability check, which is the common cloud/container deployment of dm-thin.\nUI:N - The attacker issues the discard, writes that fill metadata, or dmsetup delete themselves; no separate victim action such as mounting a crafted filesystem is required.\nS:U - Corruption and the resulting oops remain inside the host kernel\u2019s dm-thin/persistent-data authority and do not cross a VM, IOMMU, or other security boundary.\nC:H - The uninitialized new_root is later used as a metadata block number; at the time of the bug sm_ll_lookup_bitmap had no bounds check, so metadata_ll_load_ie performs an unbounded out-of-bounds read of kernel memory (as the commit\u2019s non-canonical GPF demonstrates), which per guidance scores Confidentiality High.\nI:H - The same unbounded index path exists in metadata_ll_save_ie (OOB write), and installing attacker-influenceable stack garbage as pmd->root/details_root causes subsequent btree shadowing/updates to read and write metadata through a corrupted root\u2014memory-corruption integrity impact High under the stated guidance.\nA:H - The documented consequence is a general protection fault / kernel oops when the corrupted root is reused (metadata_ll_load_ie GPF in the commit), which is a complete availability loss."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/persistent-data/dm-btree-remove.c"], "versions": [{"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "4c84b3e0728ffe10d89c633694c35a02b5c477dc", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "c154775619186781aaf8a99333ac07437a1768d5", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "73f27adaa73e3057a9ec464e33c4f54d34ea5de3", "status": "affected", "versionType": "git"}, {"version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "8fbae4a1bdb5b889490cdee929e68540151536e5", "status": "affected", "versionType": "git"}, 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"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"}], "title": "dm btree remove: assign new_root only when removal succeeds", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47343", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-23T19:04:19.383705Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:15:19.329Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", 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only through local device-mapper operations\u2014dmsetup ioctls on /dev/mapper/control (pool message \u2192 delete/create) or local block I/O/discard on a dm-thin volume that calls dm_thin_remove_range \u2192 dm_btree_remove\u2014not via network packet processing.\nAC:L - An attacker can reliably force the first shadow_step to fail (leaving spine.root uninitialized) by exhausting metadata space so dm_sm_new_block returns -ENOSPC during discard/remove, or\u2014on the admin path\u2014by placing dm-flakey under the metadata device; neither depends on a race or layout outside attacker influence.\nPR:L - Although the dmsetup path requires capable(CAP_SYS_ADMIN), dm_btree_remove is also reachable from unprivileged discard/write I/O on a thin volume via dm_thin_remove_range/__remove_range with no capability check, which is the common cloud/container deployment of dm-thin.\nUI:N - The attacker issues the discard, writes that fill metadata, or dmsetup delete themselves; no separate victim 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(metadata_ll_load_ie GPF in the commit), which is a complete availability loss."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "4c84b3e0728ffe10d89c633694c35a02b5c477dc", "versionType": "git"}, {"status": "affected", "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "c154775619186781aaf8a99333ac07437a1768d5", "versionType": "git"}, {"status": "affected", "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "73f27adaa73e3057a9ec464e33c4f54d34ea5de3", "versionType": "git"}, {"status": "affected", "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "8fbae4a1bdb5b889490cdee929e68540151536e5", "versionType": "git"}, {"status": "affected", "version": "3241b1d3e0aaafbfcd320f4d71ade629728cc4f4", "lessThan": "964d57d1962d7e68f0f578f05d9ae4a104d74851", 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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"}], "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": 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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"}, {"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->details_root o pmd->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"], "url": "https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": 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{"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1188"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dm btree remove: assign new_root only when removal succeeds", "id": "2282413", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282413"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndm btree remove: assign new_root only when removal succeeds\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().\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:\ngeneral protection fault, probably for non-canonical address 0x3fdcb14c8d7520\nCPU: 4 PID: 515 Comm: dmsetup Not tainted 5.13.0-rc6\nHardware name: QEMU Standard PC\nRIP: 0010:metadata_ll_load_ie+0x14/0x30\nCall Trace:\nsm_metadata_count_is_more_than_one+0xb9/0xe0\ndm_tm_shadow_block+0x52/0x1c0\nshadow_step+0x59/0xf0\nremove_raw+0xb2/0x170\ndm_btree_remove+0xf4/0x1c0\ndm_pool_delete_thin_device+0xc3/0x140\npool_message+0x218/0x2b0\ntarget_message+0x251/0x290\nctl_ioctl+0x1c4/0x4d0\ndm_ctl_ioctl+0xe/0x20\n__x64_sys_ioctl+0x7b/0xb0\ndo_syscall_64+0x40/0xb0\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nFixing it by only assign new_root when removal succeeds"], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47343", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47343\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47343\nhttps://lore.kernel.org/linux-cve-announce/2024052138-CVE-2021-47343-1974@gregkh/T"], "statement": "This vulnerability is rated as a moderate severity because it can cause system crashes or unpredictable behavior due to invalid memory access, but it does not directly compromise data security or allow unauthorized access.", "threat_severity": "Moderate"}

{}