UBUNTU-CVE-2021-28705

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Source
https://ubuntu.com/security/CVE-2021-28705
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28705.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-28705
Upstream
Published
2021-11-24T02:15:00Z
Modified
2025-10-24T04:50:14Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error handling in certain PoD cases has been insufficient in that in particular partial success of some operations was not properly accounted for. There are two code paths affected - page removal (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix to both issues.)

References

Affected packages

Ubuntu:16.04:LTS

xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.6.5-0ubuntu1.4?arch=source&distro=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:18.04:LTS

xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.9.2-0ubuntu1?arch=source&distro=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:20.04:LTS

xen

Package

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

Ubuntu:25.10

xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.20.0+68-g35cb38b222-1?arch=source&distro=questing

Affected ranges

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

Affected versions

4.*

4.20.0-1ubuntu1
4.20.0+68-g35cb38b222-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.20.0+68-g35cb38b222-1",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.20.0+68-g35cb38b222-1",
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