Vulnerability-Lookup

GHSA-W5H9-GVGR-JHPG

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-10-31 18:31

Details

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 + 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. ]

Severity

6.2 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2021-47228"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:12Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/ioremap: Map EFI-reserved memory as encrypted for SEV\n\nSome drivers require memory that is marked as EFI boot services\ndata. In order for this memory to not be re-used by the kernel\nafter ExitBootServices(), efi_mem_reserve() is used to preserve it\nby inserting a new EFI memory descriptor and marking it with the\nEFI_MEMORY_RUNTIME attribute.\n\nUnder SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to\nbe mapped encrypted by Linux, otherwise the kernel might crash at boot\nlike below:\n\n  EFI Variables Facility v0.08 2004-May-17\n  general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI\n  CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  RIP: 0010:efi_mokvar_entry_next\n  [...]\n  Call Trace:\n   efi_mokvar_sysfs_init\n   ? efi_mokvar_table_init\n   do_one_initcall\n   ? __kmalloc\n   kernel_init_freeable\n   ? rest_init\n   kernel_init\n   ret_from_fork\n\nExpand the __ioremap_check_other() function to additionally check for\nthis other type of boot data reserved at runtime and indicate that it\nshould be mapped encrypted for an SEV guest.\n\n [ bp: Massage commit message. ]",
  "id": "GHSA-w5h9-gvgr-jhpg",
  "modified": "2024-10-31T18:31:16Z",
  "published": "2024-05-21T15:31:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47228"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-47228 (GCVE-0-2021-47228)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2026-05-11 13:50

Title

x86/ioremap: Map EFI-reserved memory as encrypted for SEV

Summary

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 + 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. ]

Severity

6.2 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-31 18:49 UTC

CWE

CWE-noinfo Not enough information

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/208bb686e7fa7fff1…
https://git.kernel.org/stable/c/b7a05aba39f733ec3…
https://git.kernel.org/stable/c/8d651ee9c71bb12fc…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7 (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < b7a05aba39f733ec337c5b952e112dd2dc4fc404 (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b (git)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (semver) Unaffected: 5.10.46 , ≤ 5.10.* (semver) Unaffected: 5.12.13 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 6.2,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-47228",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-31T18:49:28.730368Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-31T14:37:11.006Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:07.392Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/mm/ioremap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7",
              "status": "affected",
              "version": "58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5",
              "versionType": "git"
            },
            {
              "lessThan": "b7a05aba39f733ec337c5b952e112dd2dc4fc404",
              "status": "affected",
              "version": "58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5",
              "versionType": "git"
            },
            {
              "lessThan": "8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b",
              "status": "affected",
              "version": "58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/mm/ioremap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.46",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.13",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/ioremap: Map EFI-reserved memory as encrypted for SEV\n\nSome drivers require memory that is marked as EFI boot services\ndata. In order for this memory to not be re-used by the kernel\nafter ExitBootServices(), efi_mem_reserve() is used to preserve it\nby inserting a new EFI memory descriptor and marking it with the\nEFI_MEMORY_RUNTIME attribute.\n\nUnder SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to\nbe mapped encrypted by Linux, otherwise the kernel might crash at boot\nlike below:\n\n  EFI Variables Facility v0.08 2004-May-17\n  general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI\n  CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  RIP: 0010:efi_mokvar_entry_next\n  [...]\n  Call Trace:\n   efi_mokvar_sysfs_init\n   ? efi_mokvar_table_init\n   do_one_initcall\n   ? __kmalloc\n   kernel_init_freeable\n   ? rest_init\n   kernel_init\n   ret_from_fork\n\nExpand the __ioremap_check_other() function to additionally check for\nthis other type of boot data reserved at runtime and indicate that it\nshould be mapped encrypted for an SEV guest.\n\n [ bp: Massage commit message. ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T13:50:26.392Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b"
        }
      ],
      "title": "x86/ioremap: Map EFI-reserved memory as encrypted for SEV",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47228",
    "datePublished": "2024-05-21T14:19:32.167Z",
    "dateReserved": "2024-04-10T18:59:19.530Z",
    "dateUpdated": "2026-05-11T13:50:26.392Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-W5H9-GVGR-JHPG

CVE-2021-47228 (GCVE-0-2021-47228)

Tags

Sightings

Nomenclature

Related by attack behaviour