CVE-2018-5244

low-risk
Published 2018-01-05

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.

Do I need to act?

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0.06% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Xen

Affected Vendors

Xen

References (8)

Third Party Advisory http://www.securityfocus.com/bid/102433
http://www.securitytracker.com/id/1040774
https://security.gentoo.org/glsa/201810-06
Issue Tracking https://xenbits.xen.org/xsa/advisory-253.html
Third Party Advisory http://www.securityfocus.com/bid/102433
http://www.securitytracker.com/id/1040774
https://security.gentoo.org/glsa/201810-06
Issue Tracking https://xenbits.xen.org/xsa/advisory-253.html
26
/ 100
low-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal