UBUNTU-CVE-2021-28698

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Source
https://ubuntu.com/security/CVE-2021-28698
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28698.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-28698
Upstream
Published
2021-08-27T19:15:00Z
Modified
2025-09-08T16:47:03Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones which aren't in use anymore and some which may have been created but never used. If the number of entries for a given domain is large enough, this iterating of the entire table may tie up a CPU for too long, starving other domains or causing issues in the hypervisor itself. Note that a domain may map its own grants, i.e. there is no need for multiple domains to be involved here. A pair of "cooperating" guests may, however, cause the effects to be more severe.

References

Affected packages

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: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"
        }
    ]
}