CVE-2022-42327 (GCVE-0-2022-42327)

Vulnerability from cvelistv5 – Published: 2022-11-01 00:00 – Updated: 2025-05-05 19:11
VLAI
Summary
x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-05 19:10 UTC
CWE
  • unknown
  • CWE-284 - Improper Access Control
Assigner
References
Impacted products
Vendor Product Version CPE status
Xen xen Unknown: consult Xen advisory XSA-412
guessed Create a notification for this product.
Credits
{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Andrew Cooper of Citrix.'}]}}}
Show details on NVD website
To clipboard 

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      "product_status:known_affected": "271",
      "product_status:known_not_affected": "244",
      "product_status:recommended": "222",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-42327",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-42327.json",
      "version": "45"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-03T13:03:45.969Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://xenbits.xenproject.org/xsa/advisory-412.txt"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "http://xenbits.xen.org/xsa/advisory-412.html"
              },
              {
                "name": "[oss-security] 20221101 Xen Security Advisory 412 v2 (CVE-2022-42327) - x86: unintended memory sharing between guests",
                "tags": [
                  "mailing-list",
                  "x_transferred"
                ],
                "url": "http://www.openwall.com/lists/oss-security/2022/11/01/3"
              },
              {
                "name": "FEDORA-2022-07438e12df",
                "tags": [
                  "vendor-advisory",
                  "x_transferred"
                ],
                "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/"
              },
              {
                "name": "FEDORA-2022-9f51d13fa3",
                "tags": [
                  "vendor-advisory",
                  "x_transferred"
                ],
                "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/"
              },
              {
                "name": "GLSA-202402-07",
                "tags": [
                  "vendor-advisory",
                  "x_transferred"
                ],
                "url": "https://security.gentoo.org/glsa/202402-07"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "NONE",
                  "baseScore": 7.1,
                  "baseSeverity": "HIGH",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "HIGH",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2022-42327",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-05-05T19:10:45.645601Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-284",
                    "description": "CWE-284 Improper Access Control",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-05-05T19:11:31.511Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "xen",
              "vendor": "Xen",
              "versions": [
                {
                  "status": "unknown",
                  "version": "consult Xen advisory XSA-412"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "value": "{\u0027credit_data\u0027: {\u0027description\u0027: {\u0027description_data\u0027: [{\u0027lang\u0027: \u0027eng\u0027, \u0027value\u0027: \u0027This issue was discovered by Andrew Cooper of Citrix.\u0027}]}}}"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "x86: unintended memory sharing between guests On Intel systems that support the \"virtualize APIC accesses\" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests."
            }
          ],
          "metrics": [
            {
              "other": {
                "content": {
                  "description": {
                    "description_data": [
                      {
                        "lang": "eng",
                        "value": "Guests are able to access an unintended shared memory page.  Note the\ncontents of the page are not interpreted by Xen or hardware."
                      }
                    ]
                  }
                },
                "type": "unknown"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "description": "unknown",
                  "lang": "en",
                  "type": "text"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2024-02-04T08:07:10.920Z",
            "orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
            "shortName": "XEN"
          },
          "references": [
            {
              "url": "https://xenbits.xenproject.org/xsa/advisory-412.txt"
            },
            {
              "url": "http://xenbits.xen.org/xsa/advisory-412.html"
            },
            {
              "name": "[oss-security] 20221101 Xen Security Advisory 412 v2 (CVE-2022-42327) - x86: unintended memory sharing between guests",
              "tags": [
                "mailing-list"
              ],
              "url": "http://www.openwall.com/lists/oss-security/2022/11/01/3"
            },
            {
              "name": "FEDORA-2022-07438e12df",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/"
            },
            {
              "name": "FEDORA-2022-9f51d13fa3",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/"
            },
            {
              "name": "GLSA-202402-07",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://security.gentoo.org/glsa/202402-07"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
        "assignerShortName": "XEN",
        "cveId": "CVE-2022-42327",
        "datePublished": "2022-11-01T00:00:00.000Z",
        "dateReserved": "2022-10-03T00:00:00.000Z",
        "dateUpdated": "2025-05-05T19:11:37.065Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.



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.