USN-5072-1

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

Affected packages

Ubuntu:20.04:LTS / linux-azure-5.8

Package

Name: linux-azure-5.8
Purl: pkg:deb/ubuntu/linux-azure-5.8@5.8.0-1041.44~20.04.1?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.8.0-1041.44~20.04.1

Affected versions

5.*

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

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "5.8.0-1041.44~20.04.1",
            "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"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-3653",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "high"
                }
            ]
        },
        {
            "id": "CVE-2021-3656",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "high"
                }
            ]
        }
    ]
}

Ubuntu:20.04:LTS / linux-oem-5.10

Package

Name: linux-oem-5.10
Purl: pkg:deb/ubuntu/linux-oem-5.10@5.10.0-1045.47?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.10.0-1045.47

Affected versions

5.*

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

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "5.10.0-1045.47",
            "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"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-3653",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "high"
                }
            ]
        },
        {
            "id": "CVE-2021-3656",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "high"
                }
            ]
        }
    ]
}