CVE - CVE-2021-47343

CVE-ID
CVE-2021-47343	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc URL:https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc MISC:https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3 URL:https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3 MISC:https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9 URL:https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9 MISC:https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5 URL:https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5 MISC:https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851 URL:https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851 MISC:https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a URL:https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a MISC:https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb URL:https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb MISC:https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e URL:https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e MISC:https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5 URL:https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5
Assigning CNA
kernel.org
Date Record Created
20240521	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240521)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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