{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47343","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T14:28:16.979Z","datePublished":"2024-05-21T14:35:50.293Z","dateUpdated":"2025-12-18T11:37:01.861Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-12-18T11:37:01.861Z"},"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->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"}],"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"},{"version":"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4","lessThan":"964d57d1962d7e68f0f578f05d9ae4a104d74851","status":"affected","versionType":"git"},{"version":"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4","lessThan":"ba47e65a5de3e0e8270301a409fc63d3129fdb9e","status":"affected","versionType":"git"},{"version":"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4","lessThan":"89bf942314b78d454db92427201421b5dec132d9","status":"affected","versionType":"git"},{"version":"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4","lessThan":"ad365e9351ac2b450e7e79932ff6abf59342d91a","status":"affected","versionType":"git"},{"version":"3241b1d3e0aaafbfcd320f4d71ade629728cc4f4","lessThan":"b6e58b5466b2959f83034bead2e2e1395cca8aeb","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/persistent-data/dm-btree-remove.c"],"versions":[{"version":"3.2","status":"affected"},{"version":"0","lessThan":"3.2","status":"unaffected","versionType":"semver"},{"version":"4.4.276","lessThanOrEqual":"4.4.*","status":"unaffected","versionType":"semver"},{"version":"4.9.276","lessThanOrEqual":"4.9.*","status":"unaffected","versionType":"semver"},{"version":"4.14.240","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.198","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.133","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.51","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.18","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13.3","lessThanOrEqual":"5.13.*","status":"unaffected","versionType":"semver"},{"version":"5.14","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"4.4.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"4.9.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"4.14.240"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"4.19.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"5.4.133"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"5.10.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"5.12.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"5.13.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2","versionEndExcluding":"5.14"}]}]}],"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"}],"title":"dm 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