gsd-2021-4093
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A flaw was found in the KVM's AMD code for supporting the Secure Encrypted Virtualization-Encrypted State (SEV-ES). A KVM guest using SEV-ES can trigger out-of-bounds reads and writes in the host kernel via a malicious VMGEXIT for a string I/O instruction (for example, outs or ins) using the exit reason SVM_EXIT_IOIO. This issue results in a crash of the entire system or a potential guest-to-host escape scenario.
Aliases
Aliases
CVE-2021-4093


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-4093",
    "description": "A flaw was found in the KVM\u0027s AMD code for supporting the Secure Encrypted Virtualization-Encrypted State (SEV-ES). A KVM guest using SEV-ES can trigger out-of-bounds reads and writes in the host kernel via a malicious VMGEXIT for a string I/O instruction (for example, outs or ins) using the exit reason SVM_EXIT_IOIO. This issue results in a crash of the entire system or a potential guest-to-host escape scenario.",
    "id": "GSD-2021-4093",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-4093.html",
      "https://ubuntu.com/security/CVE-2021-4093",
      "https://access.redhat.com/errata/RHSA-2022:1988"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-4093"
      ],
      "details": "A flaw was found in the KVM\u0027s AMD code for supporting the Secure Encrypted Virtualization-Encrypted State (SEV-ES). A KVM guest using SEV-ES can trigger out-of-bounds reads and writes in the host kernel via a malicious VMGEXIT for a string I/O instruction (for example, outs or ins) using the exit reason SVM_EXIT_IOIO. This issue results in a crash of the entire system or a potential guest-to-host escape scenario.",
      "id": "GSD-2021-4093",
      "modified": "2023-12-13T01:23:11.773113Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ASSIGNER": "secalert@redhat.com",
        "ID": "CVE-2021-4093",
        "STATE": "PUBLIC"
      },
      "affects": {
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          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "kernel",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "kernel 5.15"
                        }
                      ]
                    }
                  }
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              "vendor_name": "n/a"
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          }
        ]
      },
      "problemtype": {
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            "description": [
              {
                "lang": "eng",
                "value": "(CWE-125|CWE-787)"
              }
            ]
          }
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      },
      "references": {
        "reference_data": [
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            "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2028584",
            "refsource": "MISC",
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2028584"
          },
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            "refsource": "MISC",
            "url": "https://bugs.chromium.org/p/project-zero/issues/detail?id=2222"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "configurations": {
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        "nodes": [
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            "cpe_match": [
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                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "5.14.16",
                "versionStartIncluding": "5.11",
                "vulnerable": true
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            "operator": "OR"
          },
          {
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                "cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
                "cpe_name": [],
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            "operator": "OR"
          },
          {
            "children": [],
            "cpe_match": [
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          "ID": "CVE-2021-4093"
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        "data_version": "4.0",
        "description": {
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              "value": "A flaw was found in the KVM\u0027s AMD code for supporting the Secure Encrypted Virtualization-Encrypted State (SEV-ES). A KVM guest using SEV-ES can trigger out-of-bounds reads and writes in the host kernel via a malicious VMGEXIT for a string I/O instruction (for example, outs or ins) using the exit reason SVM_EXIT_IOIO. This issue results in a crash of the entire system or a potential guest-to-host escape scenario."
            }
          ]
        },
        "problemtype": {
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            {
              "description": [
                {
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                  "value": "CWE-787"
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              "tags": [
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                "Patch",
                "Third Party Advisory"
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            },
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              "refsource": "MISC",
              "tags": [
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              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2028584"
            }
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        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 7.2,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 10.0,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "HIGH",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.0,
          "impactScore": 6.0
        }
      },
      "lastModifiedDate": "2023-01-19T15:53Z",
      "publishedDate": "2022-02-18T18:15Z"
    }
  }
}


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