USN-5082-1

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)

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

Affected packages

Ubuntu:20.04:LTS / linux-oem-5.13

Package

Name: linux-oem-5.13
Purl: pkg:deb/ubuntu/linux-oem-5.13@5.13.0-1012.16?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.13.0-1012.16

Affected versions

5.*

5.13.0-1009.10

5.13.0-1010.11

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "5.13.0-1012.16",
            "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"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-3609",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "high"
                }
            ]
        },
        {
            "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"
                }
            ]
        }
    ]
}