UBUNTU-CVE-2020-15565

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Source
https://ubuntu.com/security/CVE-2020-15565
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-15565.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-15565
Related
Published
2020-07-07T13:15:00Z
Modified
2024-10-15T14:07:33Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both TLBs. Furthermore, IOMMUs may be non-coherent, and hence prior to flushing IOMMU TLBs, a CPU cache also needs writing back to memory after changes were made. Such writing back of cached data was missing in particular when splitting large page mappings into smaller granularity ones. A malicious guest may be able to retain read/write DMA access to frames returned to Xen's free pool, and later reused for another purpose. Host crashes (leading to a Denial of Service) and privilege escalation cannot be ruled out. Xen versions from at least 3.2 onwards are affected. Only x86 Intel systems are affected. x86 AMD as well as Arm systems are not affected. Only x86 HVM guests using hardware assisted paging (HAP), having a passed through PCI device assigned, and having page table sharing enabled can leverage the vulnerability. Note that page table sharing will be enabled (by default) only if Xen considers IOMMU and CPU large page size support compatible.

References

Affected packages

Ubuntu:Pro:16.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen?arch=src?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 

{
    "ubuntu_priority": "medium"
}

Ubuntu:Pro:18.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen?arch=src?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 

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.11.3+24-g14b62ab3e5-1ubuntu2.3

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "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": "libxencall1-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxendevicemodel1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxendevicemodel1-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenevtchn1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenevtchn1-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenforeignmemory1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenforeignmemory1-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxengnttab1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxengnttab1-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenmisc4.11"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenmisc4.11-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenstore3.0"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxenstore3.0-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxentoolcore1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxentoolcore1-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxentoollog1"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "libxentoollog1-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xen-doc"
        },
        {
            "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-4.11-dbgsym"
        },
        {
            "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": "xen-utils-common-dbgsym"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xenstore-utils"
        },
        {
            "binary_version": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "binary_name": "xenstore-utils-dbgsym"
        }
    ]
}

Ubuntu:22.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen?arch=src?distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.11.4+24-gddaaccbbab-1ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxen-dev"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxencall1"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxencall1-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxendevicemodel1"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxendevicemodel1-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxenevtchn1"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxenevtchn1-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxenforeignmemory1"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxenforeignmemory1-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxengnttab1"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxengnttab1-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxenmisc4.11"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxenmisc4.11-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxenstore3.0"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxenstore3.0-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxentoolcore1"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxentoolcore1-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxentoollog1"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "libxentoollog1-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-doc"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-hypervisor-4.11-amd64"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-hypervisor-4.11-arm64"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-hypervisor-4.11-armhf"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-hypervisor-common"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-system-amd64"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-system-arm64"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-system-armhf"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-utils-4.11"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-utils-4.11-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-utils-common"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xen-utils-common-dbgsym"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xenstore-utils"
        },
        {
            "binary_version": "4.11.4+24-gddaaccbbab-1ubuntu2",
            "binary_name": "xenstore-utils-dbgsym"
        }
    ]
}