{
  "cveId": "CVE-2021-47228",
  "url": "https://patchblox.com/security/cve/CVE-2021-47228",
  "summary": "CVE-2021-47228 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47228, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  x86/ioremap: Map EFI-reserved memory as encrypte...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  x86/ioremap: Map EFI-reserved memory as encrypted for SEV  Some drivers require memory that is marked as EFI boot services data. In order for this memory to not be re-used by the kernel after ExitBootServices(), efi_mem_reserve() is used to preserve it by inserting a new EFI memory descriptor and marking it with the EFI_MEMORY_RUNTIME attribute.  Under SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to be mapped encrypted by Linux, otherwise the kernel might crash at boot like below:    EFI Variables Facility v0.08 2004-May-17   general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI   CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed   Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 0.0.0 02/06/2015   RIP: 0010:efi_mokvar_entry_next   [...]   Call Trace:    efi_mokvar_sysfs_init    ? efi_mokvar_table_init    do_one_initcall    ? __kmalloc    kernel_init_freeable    ? rest_init    kernel_init    ret_from_fork  Expand the __ioremap_check_other() function to additionally check for this other type of boot data reserved at runtime and indicate that it should be mapped encrypted for an SEV guest.   [ bp: Massage commit message. ]",
  "published": "2024-05-21T15:15:12Z",
  "severity": "medium",
  "cvss": 6.2,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00237,
  "epssPercentile": 0.14828,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47228",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47228",
      "released": "2024-05-21T15:15:12Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47228",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47228",
      "released": "2024-05-21T15:15:12Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47228",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47228",
      "released": "2024-05-21T15:15:12Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}