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usn-5073-2
Vulnerability from osv_ubuntu
Published
2021-09-17 06:27
Modified
2026-06-25 10:46
Summary
linux-gcp, linux-gcp-4.15 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)

Norbert Slusarek discovered that the CAN broadcast manger (bcm) protocol implementation in the Linux kernel did not properly initialize memory in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-34693)

Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly validate data passed via an ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code on systems with a joystick device registered. (CVE-2021-3612)

It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3612",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "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"
                }
              ]
            },
            {
              "id": "CVE-2021-34693",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38160",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122~16.04.1"
          },
          {
            "binary_name": "linux-gcp-headers-4.15.0-1108",
            "binary_version": "4.15.0-1108.122~16.04.1"
          },
          {
            "binary_name": "linux-gcp-tools-4.15.0-1108",
            "binary_version": "4.15.0-1108.122~16.04.1"
          },
          {
            "binary_name": "linux-headers-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122~16.04.1"
          },
          {
            "binary_name": "linux-image-unsigned-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122~16.04.1"
          },
          {
            "binary_name": "linux-modules-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122~16.04.1"
          },
          {
            "binary_name": "linux-modules-extra-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122~16.04.1"
          },
          {
            "binary_name": "linux-tools-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122~16.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "linux-gcp",
        "purl": "pkg:deb/ubuntu/linux-gcp@4.15.0-1108.122~16.04.1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-1108.122~16.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
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        "4.10.0-1006.6",
        "4.10.0-1007.7",
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        "4.15.0-1025.26~16.04.1",
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        "4.15.0-1027.28~16.04.1",
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        "4.15.0-1036.38~16.04.1",
        "4.15.0-1037.39~16.04.1",
        "4.15.0-1040.42~16.04.1",
        "4.15.0-1041.43",
        "4.15.0-1042.44",
        "4.15.0-1044.46",
        "4.15.0-1046.49",
        "4.15.0-1047.50",
        "4.15.0-1049.52",
        "4.15.0-1050.53",
        "4.15.0-1052.56",
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        "4.15.0-1078.88~16.04.1",
        "4.15.0-1080.90~16.04.1",
        "4.15.0-1081.92~16.04.1",
        "4.15.0-1083.94~16.04.1",
        "4.15.0-1084.95~16.04.1",
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        "4.15.0-1091.104~16.04.1",
        "4.15.0-1092.105~16.04.1",
        "4.15.0-1093.106~16.04.1",
        "4.15.0-1094.107~16.04.1",
        "4.15.0-1095.108~16.04.1",
        "4.15.0-1096.109~16.04.1",
        "4.15.0-1097.110~16.04.1",
        "4.15.0-1098.111~16.04.1",
        "4.15.0-1099.112~16.04.1",
        "4.15.0-1100.113~16.04.1",
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        "4.15.0-1107.121~16.04.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3612",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "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"
                }
              ]
            },
            {
              "id": "CVE-2021-34693",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-38160",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122"
          },
          {
            "binary_name": "linux-gcp-4.15-headers-4.15.0-1108",
            "binary_version": "4.15.0-1108.122"
          },
          {
            "binary_name": "linux-gcp-4.15-tools-4.15.0-1108",
            "binary_version": "4.15.0-1108.122"
          },
          {
            "binary_name": "linux-headers-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122"
          },
          {
            "binary_name": "linux-image-unsigned-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122"
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            "binary_version": "4.15.0-1108.122"
          },
          {
            "binary_name": "linux-tools-4.15.0-1108-gcp",
            "binary_version": "4.15.0-1108.122"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "linux-gcp-4.15",
        "purl": "pkg:deb/ubuntu/linux-gcp-4.15@4.15.0-1108.122?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.15.0-1108.122"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.15.0-1071.81",
        "4.15.0-1077.87",
        "4.15.0-1078.88",
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        "4.15.0-1103.116",
        "4.15.0-1106.120",
        "4.15.0-1107.121"
      ]
    }
  ],
  "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\nNorbert Slusarek discovered that the CAN broadcast manger (bcm) protocol\nimplementation in the Linux kernel did not properly initialize memory in\nsome situations. A local attacker could use this to expose sensitive\ninformation (kernel memory). (CVE-2021-34693)\n\nMurray McAllister discovered that the joystick device interface in the\nLinux kernel did not properly validate data passed via an ioctl(). A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code on systems with a joystick device\nregistered. (CVE-2021-3612)\n\nIt was discovered that the Virtio console implementation in the Linux\nkernel did not properly validate input lengths in some situations. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-38160)\n",
  "id": "USN-5073-2",
  "modified": "2026-06-25T10:46:01Z",
  "published": "2021-09-17T06:27:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5073-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3612"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3653"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3656"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-34693"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38160"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux-gcp, linux-gcp-4.15 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-3612",
    "UBUNTU-CVE-2021-3653",
    "UBUNTU-CVE-2021-3656",
    "UBUNTU-CVE-2021-34693",
    "UBUNTU-CVE-2021-38160"
  ]
}



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