A domain cleanup issue was discovered in the C xenstore daemon (aka cxenstored) in Xen through 4.9.x. When shutting down a VM with a stubdomain, a race in cxenstored may cause a double-free. The xenstored daemon may crash, resulting in a DoS of any parts of the system relying on it (including domain creation / destruction, ballooning, device changes, etc.).
Exploitability
AV:LAC:HPR:LUI:NScope
S:CImpact
C:NI:NA:H5.6/CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H