GSD-2021-3653

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to 5.14-rc7.
Aliases
Aliases
CVE-2021-3653
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{
  "GSD": {
    "alias": "CVE-2021-3653",
    "description": "A flaw was found in the KVM\u0027s AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the \"int_ctl\" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to 5.14-rc7.",
    "id": "GSD-2021-3653",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-3653.html",
      "https://www.debian.org/security/2021/dsa-4978",
      "https://access.redhat.com/errata/RHSA-2021:4768",
      "https://access.redhat.com/errata/RHSA-2021:4692",
      "https://access.redhat.com/errata/RHSA-2021:3987",
      "https://access.redhat.com/errata/RHSA-2021:3909",
      "https://access.redhat.com/errata/RHSA-2021:3904",
      "https://access.redhat.com/errata/RHSA-2021:3812",
      "https://access.redhat.com/errata/RHSA-2021:3802",
      "https://access.redhat.com/errata/RHSA-2021:3801",
      "https://access.redhat.com/errata/RHSA-2021:3767",
      "https://access.redhat.com/errata/RHSA-2021:3676",
      "https://access.redhat.com/errata/RHSA-2021:3548",
      "https://access.redhat.com/errata/RHSA-2021:3547",
      "https://ubuntu.com/security/CVE-2021-3653",
      "https://advisories.mageia.org/CVE-2021-3653.html",
      "https://security.archlinux.org/CVE-2021-3653",
      "https://linux.oracle.com/cve/CVE-2021-3653.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
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      "details": "A flaw was found in the KVM\u0027s AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the \"int_ctl\" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to 5.14-rc7.",
      "id": "GSD-2021-3653",
      "modified": "2023-12-13T01:23:35.101185Z",
      "schema_version": "1.4.0"
    }
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          "cvssV2": {
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            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.1,
            "confidentialityImpact": "PARTIAL",
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            "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:C",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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      },
      "lastModifiedDate": "2023-05-16T10:49Z",
      "publishedDate": "2021-09-29T20:15Z"
    }
  }
}


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  • 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.
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  • 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.



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