{
  "cveId": "CVE-2021-47463",
  "url": "https://patchblox.com/security/cve/CVE-2021-47463",
  "summary": "CVE-2021-47463 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47463, released May 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/secretmem: fix NULL page-\u003Emapping dereference...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/secretmem: fix NULL page-\u003Emapping dereference in page_is_secretmem()  Check for a NULL page-\u003Emapping before dereferencing the mapping in page_is_secretmem(), as the page\u0027s mapping can be nullified while gup() is running, e.g.  by reclaim or truncation.    BUG: kernel NULL pointer dereference, address: 0000000000000068   #PF: supervisor read access in kernel mode   #PF: error_code(0x0000) - not-present page   PGD 0 P4D 0   Oops: 0000 [#1] PREEMPT SMP NOPTI   CPU: 6 PID: 4173897 Comm: CPU 3/KVM Tainted: G        W   RIP: 0010:internal_get_user_pages_fast\u002B0x621/0x9d0   Code: \u003C48\u003E 81 7a 68 80 08 04 bc 0f 85 21 ff ff 8 89 c7 be   RSP: 0018:ffffaa90087679b0 EFLAGS: 00010046   RAX: ffffe3f37905b900 RBX: 00007f2dd561e000 RCX: ffffe3f37905b934   RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe3f37905b900   ...   CR2: 0000000000000068 CR3: 00000004c5898003 CR4: 00000000001726e0   Call Trace:    get_user_pages_fast_only\u002B0x13/0x20    hva_to_pfn\u002B0xa9/0x3e0    try_async_pf\u002B0xa1/0x270    direct_page_fault\u002B0x113/0xad0    kvm_mmu_page_fault\u002B0x69/0x680    vmx_handle_exit\u002B0xe1/0x5d0    kvm_arch_vcpu_ioctl_run\u002B0xd81/0x1c70    kvm_vcpu_ioctl\u002B0x267/0x670    __x64_sys_ioctl\u002B0x83/0xa0    do_syscall_64\u002B0x56/0x80    entry_SYSCALL_64_after_hwframe\u002B0x44/0xae",
  "published": "2024-05-22T07:15:11Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0018,
  "epssPercentile": 0.07637,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.14.16-1",
      "fix": "DEBIAN-CVE-2021-47463",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47463",
      "released": "2024-05-22T07:15:11Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.14.16-1",
      "fix": "DEBIAN-CVE-2021-47463",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47463",
      "released": "2024-05-22T07:15:11Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.14.16-1",
      "fix": "DEBIAN-CVE-2021-47463",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47463",
      "released": "2024-05-22T07:15:11Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}