{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-47343",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "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"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "1da177e4c3f4",
                                            "version_value": "4c84b3e0728f"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "4.4.276",
                                                        "lessThanOrEqual": "4.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.9.276",
                                                        "lessThanOrEqual": "4.9.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.14.240",
                                                        "lessThanOrEqual": "4.14.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "4.19.198",
                                                        "lessThanOrEqual": "4.19.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.4.133",
                                                        "lessThanOrEqual": "5.4.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.10.51",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.12.18",
                                                        "lessThanOrEqual": "5.12.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.13.3",
                                                        "lessThanOrEqual": "5.13.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.14",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/4c84b3e0728ffe10d89c633694c35a02b5c477dc"
            },
            {
                "url": "https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/c154775619186781aaf8a99333ac07437a1768d5"
            },
            {
                "url": "https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/73f27adaa73e3057a9ec464e33c4f54d34ea5de3"
            },
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                "url": "https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/8fbae4a1bdb5b889490cdee929e68540151536e5"
            },
            {
                "url": "https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/964d57d1962d7e68f0f578f05d9ae4a104d74851"
            },
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                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/ba47e65a5de3e0e8270301a409fc63d3129fdb9e"
            },
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                "url": "https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/89bf942314b78d454db92427201421b5dec132d9"
            },
            {
                "url": "https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/ad365e9351ac2b450e7e79932ff6abf59342d91a"
            },
            {
                "url": "https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/b6e58b5466b2959f83034bead2e2e1395cca8aeb"
            }
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