Bug 1610548 – CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269)

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Bug 1610548 - (CVE-2018-15468) CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BTS (XSA-269)

Summary:	CVE-2018-15468 xen: x86 Incorrect MSR_DEBUGCTL handling lets guests enable BT...

Status:	CLOSED NOTABUG

Aliases:	CVE-2018-15468

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=moderate,public=20180814:1700,...
Keywords:	Security

Depends On:	1616077
Blocks:	1610551
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Reported:	2018-07-31 17:48 EDT by Laura Pardo
Modified:	2018-10-09 08:01 EDT (History)
CC List:	13 users (show)

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Last Closed:	2018-10-09 08:01:10 EDT
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Description Laura Pardo 2018-07-31 17:48:16 EDT

A flaw was found in xen. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. A malicious or buggy guest administrator can lock up the entire host, causing a Denial of Service.

Comment 1 Laura Pardo 2018-08-14 17:48:09 EDT

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1616077]

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