{"id":"CVE-2021-47343","details":"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","modified":"2026-03-13T05:20:43.668659Z","published":"2024-05-21T15:15:20.993Z","related":["SUSE-SU-2024:1979-1","SUSE-SU-2024:1983-1","SUSE-SU-2024:2010-1","SUSE-SU-2024:2184-1","SUSE-SU-2024:2185-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb"},{"type":"FIX","url":"https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc"},{"type":"FIX","url":"https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e"},{"type":"FIX","url":"https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5"},{"type":"FIX","url":"https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9"},{"type":"FIX","url":"https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5"},{"type":"FIX","url":"https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47343.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"4.4.276"}]},{"events":[{"introduced":"4.5"},{"fixed":"4.9.276"}]},{"events":[{"introduced":"4.10"},{"fixed":"4.14.240"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.198"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.133"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.51"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.12.18"}]},{"events":[{"introduced":"5.13"},{"fixed":"5.13.3"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}