Bug 1660493 (CVE-2018-19967)

Summary: CVE-2018-19967 xen: guest use of HLE constructs may lock up host
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2018-12-18 13:06:26 UTC Type: ---
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Description Andrej Nemec 2018-12-18 13:06:10 UTC 

Various Intel CPU models have an erratum listed under the title
"Processor May Hang When Executing Code In an HLE Transaction".  It
describes a potential hang when using instructions with the XACQUIRE
prefix on the host physical memory range covering the first 4 MiB
starting at the 1GiB boundary.

A malicious or buggy guest may cause a CPU to hang, resulting in a DoS
(Denial of Service) affecting the entire host.

References:

https://xenbits.xen.org/xsa/advisory-282.html