usn-5072-1
Vulnerability from osv_ubuntu
Published
2021-09-08 23:48
Modified
2026-06-03 10:45
Summary
linux-azure-5.8, linux-oem-5.10 vulnerabilities
Details

Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a guest VM could use this to read or write portions of the host's physical memory. (CVE-2021-3656)

Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host's physical memory. (CVE-2021-3653)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3653",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-3656",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-azure-5.8-cloud-tools-5.8.0-1041",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-azure-5.8-headers-5.8.0-1041",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-azure-5.8-tools-5.8.0-1041",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-buildinfo-5.8.0-1041-azure",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-cloud-tools-5.8.0-1041-azure",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-headers-5.8.0-1041-azure",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-5.8.0-1041-azure",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-modules-5.8.0-1041-azure",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-modules-extra-5.8.0-1041-azure",
            "binary_version": "5.8.0-1041.44~20.04.1"
          },
          {
            "binary_name": "linux-tools-5.8.0-1041-azure",
            "binary_version": "5.8.0-1041.44~20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "linux-azure-5.8",
        "purl": "pkg:deb/ubuntu/linux-azure-5.8@5.8.0-1041.44~20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.8.0-1041.44~20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.8.0-1033.35~20.04.1",
        "5.8.0-1036.38~20.04.1",
        "5.8.0-1039.42~20.04.1",
        "5.8.0-1040.43~20.04.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3653",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-3656",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-5.10.0-1045-oem",
            "binary_version": "5.10.0-1045.47"
          },
          {
            "binary_name": "linux-headers-5.10.0-1045-oem",
            "binary_version": "5.10.0-1045.47"
          },
          {
            "binary_name": "linux-image-unsigned-5.10.0-1045-oem",
            "binary_version": "5.10.0-1045.47"
          },
          {
            "binary_name": "linux-modules-5.10.0-1045-oem",
            "binary_version": "5.10.0-1045.47"
          },
          {
            "binary_name": "linux-oem-5.10-headers-5.10.0-1045",
            "binary_version": "5.10.0-1045.47"
          },
          {
            "binary_name": "linux-oem-5.10-tools-5.10.0-1045",
            "binary_version": "5.10.0-1045.47"
          },
          {
            "binary_name": "linux-oem-5.10-tools-host",
            "binary_version": "5.10.0-1045.47"
          },
          {
            "binary_name": "linux-tools-5.10.0-1045-oem",
            "binary_version": "5.10.0-1045.47"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "linux-oem-5.10",
        "purl": "pkg:deb/ubuntu/linux-oem-5.10@5.10.0-1045.47?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.10.0-1045.47"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.10.0-1008.9",
        "5.10.0-1011.12",
        "5.10.0-1013.14",
        "5.10.0-1014.15",
        "5.10.0-1016.17",
        "5.10.0-1017.18",
        "5.10.0-1019.20",
        "5.10.0-1021.22",
        "5.10.0-1022.23",
        "5.10.0-1023.24",
        "5.10.0-1025.26",
        "5.10.0-1026.27",
        "5.10.0-1029.30",
        "5.10.0-1032.33",
        "5.10.0-1033.34",
        "5.10.0-1034.35",
        "5.10.0-1038.40",
        "5.10.0-1044.46"
      ]
    }
  ],
  "aliases": [],
  "details": "Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor\nimplementation for AMD processors in the Linux kernel allowed a guest VM to\ndisable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a\nguest VM could use this to read or write portions of the host\u0027s physical\nmemory. (CVE-2021-3656)\n\nMaxim Levitsky discovered that the KVM hypervisor implementation for AMD\nprocessors in the Linux kernel did not properly prevent a guest VM from\nenabling AVIC in nested guest VMs. An attacker in a guest VM could use this\nto write to portions of the host\u0027s physical memory. (CVE-2021-3653)\n",
  "id": "USN-5072-1",
  "modified": "2026-06-03T10:45:26Z",
  "published": "2021-09-08T23:48:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5072-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3653"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3656"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-azure-5.8, linux-oem-5.10 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-3653",
    "UBUNTU-CVE-2021-3656"
  ]
}



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