383 lines
20 KiB
JSON
383 lines
20 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2021-47343",
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"dateReserved": "2024-05-21T14:28:16.979Z",
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"datePublished": "2024-05-21T14:35:50.293Z",
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"dateUpdated": "2026-08-05T08:47:20.543Z"
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"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"
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}
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"baseScore": 7.8,
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"value": "AV:L - The vulnerable path is reached only through local device-mapper operations—dmsetup ioctls on /dev/mapper/control (pool message → delete/create) or local block I/O/discard on a dm-thin volume that calls dm_thin_remove_range → dm_btree_remove—not 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—on the admin path—by 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’s 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’s 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—memory-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."
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}
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