cve-2021-47463
Vulnerability from cvelistv5
Published
2024-05-22 06:23
Modified
2024-08-04 05:39
Severity
Summary
mm/secretmem: fix NULL page->mapping dereference in page_is_secretmem()
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
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                "timestamp": "2024-05-22T17:54:35.234529Z",
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/secretmem: fix NULL page-\u003emapping dereference in page_is_secretmem()\n\nCheck for a NULL page-\u003emapping before dereferencing the mapping in\npage_is_secretmem(), as the page\u0027s 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: \u003c48\u003e 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"
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      "title": "mm/secretmem: fix NULL page-\u003emapping dereference in page_is_secretmem()",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47463",
    "datePublished": "2024-05-22T06:23:23.688Z",
    "dateReserved": "2024-05-22T06:20:56.198Z",
    "dateUpdated": "2024-08-04T05:39:59.505Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47463\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:11.193\",\"lastModified\":\"2024-05-22T12:46:53.887\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/secretmem: fix NULL page-\u003emapping dereference in page_is_secretmem()\\n\\nCheck for a NULL page-\u003emapping before dereferencing the mapping in\\npage_is_secretmem(), as the page\u0027s 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: \u003c48\u003e 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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/secretmem: corrige la p\u00e1gina NULL-\u0026gt;desreferencia de mapeo en page_is_secretmem() Verifique si hay una p\u00e1gina NULL-\u0026gt;mapping antes de desreferenciar el mapeo en page_is_secretmem(), ya que el mapeo de la p\u00e1gina puede ser anulado mientras se ejecuta gup(), por ejemplo, mediante recuperaci\u00f3n o truncamiento. ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 00000000000000068 #PF: acceso de lectura del supervisor en modo kernel #PF: c\u00f3digo_error(0x0000) - p\u00e1gina no presente PGD 0 P4D 0 Ups: 0000 [#1] PREEMPT SMP NOPTI CPU: 6 PID: 4173897 Comunicaciones: CPU 3/KVM contaminada: GW RIP: 0010:internal_get_user_pages_fast+0x621/0x9d0 C\u00f3digo: \u0026lt;48\u0026gt; 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be RSP: ffffaa90087679 b0 EFLAGS: 00010046 RAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934 RDX: 0000000000000000 RSI: 00000000000000000 RDI: ffffe3f37905b900 ... CR2: 0000068 CR3: 00000004c5898003 CR4: 00000000001726e0 Seguimiento de llamadas: get_user_pages_fast_only+0x13/0x20 hva_to_pfn+0xa9/0x3e0 try_async_pf+0xa1/0x270 direct_page_fault+0x113/ 0xad0 kvm_mmu_page_fault+0x69/0x680 vmx_handle_exit+0xe1/0x5d0 kvm_arch_vcpu_ioctl_run+0xd81/0x1c70 kvm_vcpu_ioctl+0x267/0x670 __x64_sys_ioctl+0x83/0xa0 scall_64+0x56/0x80 entrada_SYSCALL_64_after_hwframe+0x44/0xae\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/79f9bc5843142b649575f887dccdf1c07ad75c20\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b77ba1e02345bafd703f0d407bdbd88c3be1f767\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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