CVE-2018-5244

Severity: medium (CVSS 6.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-01-05 · updated 2026-06-17
Weakness: CWE-119

Description

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.

Affected products

xen: from 4.10.0

References

http://www.securityfocus.com/bid/102433
http://www.securitytracker.com/id/1040774
https://security.gentoo.org/glsa/201810-06
https://xenbits.xen.org/xsa/advisory-253.html
http://www.securityfocus.com/bid/102433
http://www.securitytracker.com/id/1040774
https://security.gentoo.org/glsa/201810-06
https://xenbits.xen.org/xsa/advisory-253.html

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