{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2021-47463",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/secretmem: fix NULL page->mapping dereference in page_is_secretmem()\n\nCheck for a NULL page->mapping before dereferencing the mapping in\npage_is_secretmem(), as the page's mapping can be nullified while gup()\nis running, e.g.  by reclaim or truncation.\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000068\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  PGD 0 P4D 0\n  Oops: 0000 [#1] PREEMPT SMP NOPTI\n  CPU: 6 PID: 4173897 Comm: CPU 3/KVM Tainted: G        W\n  RIP: 0010:internal_get_user_pages_fast+0x621/0x9d0\n  Code: <48> 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be\n  RSP: 0018:ffffaa90087679b0 EFLAGS: 00010046\n  RAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934\n  RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe3f37905b900\n  ...\n  CR2: 0000000000000068 CR3: 00000004c5898003 CR4: 00000000001726e0\n  Call Trace:\n   get_user_pages_fast_only+0x13/0x20\n   hva_to_pfn+0xa9/0x3e0\n   try_async_pf+0xa1/0x270\n   direct_page_fault+0x113/0xad0\n   kvm_mmu_page_fault+0x69/0x680\n   vmx_handle_exit+0xe1/0x5d0\n   kvm_arch_vcpu_ioctl_run+0xd81/0x1c70\n   kvm_vcpu_ioctl+0x267/0x670\n   __x64_sys_ioctl+0x83/0xa0\n   do_syscall_64+0x56/0x80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae"
            }
        ]
    },
    "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": "1507f51255c9",
                                            "version_value": "b77ba1e02345"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "5.14",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "5.14",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.14.15",
                                                        "lessThanOrEqual": "5.14.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.15",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767"
            },
            {
                "url": "https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20"
            }
        ]
    },
    "generator": {
        "engine": "bippy-a5840b7849dd"
    }
}