usn-5082-1
Vulnerability from osv_ubuntu
Published
2021-09-16 16:49
Modified
2026-06-03 10:45
Summary
linux-oem-5.13 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 a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3609",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "linux-buildinfo-5.13.0-1012-oem",
            "binary_version": "5.13.0-1012.16"
          },
          {
            "binary_name": "linux-headers-5.13.0-1012-oem",
            "binary_version": "5.13.0-1012.16"
          },
          {
            "binary_name": "linux-image-unsigned-5.13.0-1012-oem",
            "binary_version": "5.13.0-1012.16"
          },
          {
            "binary_name": "linux-modules-5.13.0-1012-oem",
            "binary_version": "5.13.0-1012.16"
          },
          {
            "binary_name": "linux-oem-5.13-headers-5.13.0-1012",
            "binary_version": "5.13.0-1012.16"
          },
          {
            "binary_name": "linux-oem-5.13-tools-5.13.0-1012",
            "binary_version": "5.13.0-1012.16"
          },
          {
            "binary_name": "linux-oem-5.13-tools-host",
            "binary_version": "5.13.0-1012.16"
          },
          {
            "binary_name": "linux-tools-5.13.0-1012-oem",
            "binary_version": "5.13.0-1012.16"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "linux-oem-5.13",
        "purl": "pkg:deb/ubuntu/linux-oem-5.13@5.13.0-1012.16?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.13.0-1012.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.13.0-1009.10",
        "5.13.0-1010.11"
      ]
    }
  ],
  "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 a race condition in the CAN BCM networking\nprotocol of the Linux kernel leading to multiple use-after-free\nvulnerabilities. A local attacker could use this issue to execute arbitrary\ncode. (CVE-2021-3609)\n",
  "id": "USN-5082-1",
  "modified": "2026-06-03T10:45:26Z",
  "published": "2021-09-16T16:49:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5082-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3609"
    },
    {
      "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-oem-5.13 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-3609",
    "UBUNTU-CVE-2021-3653",
    "UBUNTU-CVE-2021-3656"
  ]
}



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