UBUNTU-CVE-2021-28695

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Source
https://ubuntu.com/security/CVE-2021-28695
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28695.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-28695
Upstream
Published
2021-08-27T19:15:00Z
Modified
2025-09-08T16:47:03Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).

References

Affected packages

Ubuntu:Pro:16.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.6.5-0ubuntu1.4?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.5.1-0ubuntu1
4.5.1-0ubuntu2
4.6.0-1ubuntu1
4.6.0-1ubuntu2
4.6.0-1ubuntu4
4.6.0-1ubuntu4.1
4.6.0-1ubuntu4.2
4.6.0-1ubuntu4.3
4.6.5-0ubuntu1
4.6.5-0ubuntu1.1
4.6.5-0ubuntu1.2
4.6.5-0ubuntu1.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "libxen-4.6"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "libxenstore3.0"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.4-amd64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.4-arm64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.4-armhf"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.5-amd64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.5-arm64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.5-armhf"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.6-amd64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.6-arm64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-hypervisor-4.6-armhf"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-utils-4.6"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.6.5-0ubuntu1.4",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:Pro:18.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.9.2-0ubuntu1?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.9.0-0ubuntu3
4.9.0-0ubuntu4
4.9.2-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "libxen-4.9"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "libxenstore3.0"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.6-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.6-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.6-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.7-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.7-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.7-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.8-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.8-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.8-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.9-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.9-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-hypervisor-4.9-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-utils-4.9"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.9.2-0ubuntu1",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:Pro:20.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.11.3+24-g14b62ab3e5-1ubuntu2.3?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.9.2-0ubuntu2
4.9.2-0ubuntu6
4.9.2-0ubuntu7
4.11.3+24-g14b62ab3e5-1ubuntu1
4.11.3+24-g14b62ab3e5-1ubuntu2
4.11.3+24-g14b62ab3e5-1ubuntu2.2
4.11.3+24-g14b62ab3e5-1ubuntu2.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxencall1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxendevicemodel1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenevtchn1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenforeignmemory1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxengnttab1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenmisc4.11"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenstore3.0"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxentoolcore1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxentoollog1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.11-amd64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.11-arm64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.11-armhf"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.9-amd64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.9-arm64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-4.9-armhf"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-utils-4.11"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:22.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.16.0-1~ubuntu2.1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.11.4+24-gddaaccbbab-1ubuntu2
4.16.0-1~ubuntu2
4.16.0-1~ubuntu2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxencall1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxendevicemodel1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenevtchn1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenforeignmemory1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxengnttab1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenhypfs1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenmisc4.16"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxenstore4"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxentoolcore1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "libxentoollog1"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-hypervisor-4.16-amd64"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-hypervisor-4.16-arm64"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-hypervisor-4.16-armhf"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-utils-4.16"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.16.0-1~ubuntu2.1",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:24.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.17.3+10-g091466ba55-1.1ubuntu3?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.17.2-1
4.17.2+55-g0b56bed864-1
4.17.2+76-ge1f9cb16e2-1
4.17.2+76-ge1f9cb16e2-1ubuntu1
4.17.3+10-g091466ba55-1
4.17.3+10-g091466ba55-1.1ubuntu2
4.17.3+10-g091466ba55-1.1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxencall1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxendevicemodel1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenevtchn1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenforeignmemory1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxengnttab1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenhypfs1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenmisc4.17t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxenstore4t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxentoolcore1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "libxentoollog1t64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-hypervisor-4.17-amd64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-hypervisor-4.17-arm64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-hypervisor-4.17-armhf"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-utils-4.17"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.17.3+10-g091466ba55-1.1ubuntu3",
            "binary_name": "xenstore-utils"
        }
    ]
}

Ubuntu:25.04 / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.20.0-1ubuntu1?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.17.3+10-g091466ba55-1.1ubuntu3
4.19.1-1ubuntu3
4.20.0-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxencall1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxendevicemodel1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenevtchn1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenforeignmemory1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxengnttab1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenhypfs1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenmisc4.20"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxenstore4"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxentoolcore1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "libxentoollog1"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-hypervisor-4.20-amd64"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-hypervisor-4.20-arm64"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-utils-4.20"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.20.0-1ubuntu1",
            "binary_name": "xenstore-utils"
        }
    ]
}