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CVE-2018-5244

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation...

6.5 MediumFix available

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.37%Down 0.9 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

Record
CVE-2018-5244
CVSS 3.0
6.5 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CVSS 2.0
4.9 MediumAV:L/AC:L/Au:N/C:N/I:N/A:C
Weakness
CWE-119
Updated
2026-11-02
CVE List No score

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

Record
CVE-2018-5244
Updated
2026-11-02
EUVDEUVD-2018-17026 No score

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

Record
EUVD-2018-17026
Updated
2026-11-03
GitHub AdvisoriesGHSA-3r9m-2j47-xq4r 6.5

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation...

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

Record
GHSA-3r9m-2j47-xq4r
CVSS 3.0
6.5 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness
CWE-119
Updated
2026-11-02
OSVALPINE-CVE-2018-5244 6.5

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

Record
ALPINE-CVE-2018-5244
CVSS 3.0
6.5 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Updated
2026-11-02
OSV 6.5

In Xen 4.10, new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. Unfortunately, one tracking structure isn't freed when a vcpu is destroyed. This allows guest OS administrators to cause a denial of service (host OS memory consumption) by rebooting many times.

Record
CVE-2018-5244
CVSS 3.0
6.5 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2024:11520-1 No score

xen-4.15.1_01-1.2 on GA media

These are all security issues fixed in the xen-4.15.1_01-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11520-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xen
Alpine:v3.15
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.16
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.17
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.18
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.19
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.20
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.21
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.22
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.23
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
Alpine:v3.24
4.10.0 up to 4.10.0-r1
4.10.0-r1
xen
openSUSE:Tumbleweed
From an advisory covering 93 CVEs
before 4.15.1_01-1.2
4.15.1_01-1.2

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-5244 is a medium vulnerability (CVSS 6.5) in Xen, published January 5, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 31st percentile. Fixed in xen 4.10.0-r1.

References

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