usn-5070-1
Vulnerability from osv_ubuntu
Published
2021-09-08 23:38
Modified
2026-06-03 10:45
Summary
linux, linux-aws, linux-aws-5.11, linux-azure, linux-azure-5.11, linux-gcp, linux-hwe-5.11, linux-kvm, linux-oracle, linux-oracle-5.11, linux-raspi 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)

It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions. (CVE-2020-26541)

It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. An attacker who could start and control a VM could possibly use this to expose sensitive information or execute arbitrary code. (CVE-2021-22543)

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 KVM hypervisor implementation in the Linux kernel did not properly compute the access permissions for shadow pages in some situations. A local attacker could use this to cause a denial of service. (CVE-2021-38198)

It was discovered that the perf subsystem in the Linux kernel for the PowerPC architecture contained a null pointer dereference in some situations. An attacker could use this to cause a denial of service (system crash). (CVE-2021-38200)

Ben Greear discovered that the mac80211 subsystem in the Linux kernel contained a null pointer dereference in some situations. A physically proximate attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38206)

It was discovered that the Xilinx LL TEMAC device driver in the Linux kernel did not properly calculate the number of buffers to be used in certain situations. A remote attacker could use this to cause a denial of service (system crash). (CVE-2021-38207)

References
To clipboard 

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            "binary_version": "5.11.0-1017.18~20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "linux-oracle-5.11",
        "purl": "pkg:deb/ubuntu/linux-oracle-5.11@5.11.0-1017.18~20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.11.0-1017.18~20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.11.0-1008.8~20.04.1",
        "5.11.0-1013.14~20.04.1",
        "5.11.0-1016.17~20.04.1"
      ]
    }
  ],
  "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\nIt was discovered that the Linux kernel did not properly enforce certain\ntypes of entries in the Secure Boot Forbidden Signature Database (aka dbx)\nprotection mechanism. An attacker could use this to bypass UEFI Secure Boot\nrestrictions. (CVE-2020-26541)\n\nIt was discovered that the KVM hypervisor implementation in the Linux\nkernel did not properly perform reference counting in some situations,\nleading to a use-after-free vulnerability. An attacker who could start and\ncontrol a VM could possibly use this to expose sensitive information or\nexecute arbitrary code. (CVE-2021-22543)\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 KVM hypervisor implementation in the Linux\nkernel did not properly compute the access permissions for shadow pages in\nsome situations. A local attacker could use this to cause a denial of\nservice. (CVE-2021-38198)\n\nIt was discovered that the perf subsystem in the Linux kernel for the\nPowerPC architecture contained a null pointer dereference in some\nsituations. An attacker could use this to cause a denial of service (system\ncrash). (CVE-2021-38200)\n\nBen Greear discovered that the mac80211 subsystem in the Linux kernel\ncontained a null pointer dereference in some situations. A physically\nproximate attacker could possibly use this to cause a denial of service\n(system crash). (CVE-2021-38206)\n\nIt was discovered that the Xilinx LL TEMAC device driver in the Linux\nkernel did not properly calculate the number of buffers to be used in\ncertain situations. A remote attacker could use this to cause a denial of\nservice (system crash). (CVE-2021-38207)\n",
  "id": "USN-5070-1",
  "modified": "2026-06-03T10:45:26Z",
  "published": "2021-09-08T23:38:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5070-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-26541"
    },
    {
      "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-2021-22543"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-34693"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38198"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38200"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38206"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38207"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux, linux-aws, linux-aws-5.11, linux-azure, linux-azure-5.11, linux-gcp, linux-hwe-5.11, linux-kvm, linux-oracle, linux-oracle-5.11, linux-raspi vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2020-26541",
    "UBUNTU-CVE-2021-3612",
    "UBUNTU-CVE-2021-3653",
    "UBUNTU-CVE-2021-3656",
    "UBUNTU-CVE-2021-22543",
    "UBUNTU-CVE-2021-34693",
    "UBUNTU-CVE-2021-38198",
    "UBUNTU-CVE-2021-38200",
    "UBUNTU-CVE-2021-38206",
    "UBUNTU-CVE-2021-38207"
  ]
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.