Bug 1164253 (CVE-2014-8866, xsa111)

Summary:	CVE-2014-8866 xen: Excessive checking in compatibility mode hypercall argument translation (xsa111)
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	drjones, imammedo, pbonzini, rkrcmar, security-response-team, vkuznets
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-11-14 13:24:37 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1164260

Description Petr Matousek 2014-11-14 13:22:03 UTC

The hypercall argument translation needed for 32-bit guests running on
64-bit hypervisors performs checks on the final register state. These
checks cover all registers potentially holding hypercall arguments,
not just the ones actually doing so for the hypercall being processed,
since the code was originally intended for use only by PV guests.

A buggy or malicious HVM guest can crash the host.

Acknowledgements:

Red Hat would like to thank the Xen for reporting this issue.

Comment 3 Petr Matousek 2014-11-14 13:24:37 UTC

Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.