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Servers and applications

CVE-2018-5244

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.

Severity
Medium 6.5
Published
5 Jan 2018
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
0.4% in the next 30 daysHigher than 31% of CVEs. EPSS by FIRST, 11 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
XenServers and applications · cpe:o:xen:xen
  • From 4.10.0 on

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-5244
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-5244