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Bug 1160643 - (CVE-2014-8595, xsa110) CVE-2014-8595 kernel: xen: Missing privilege level checks in x86 emulation of far branches (xsa110)
CVE-2014-8595 kernel: xen: Missing privilege level checks in x86 emulation of...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20141118,repo...
: Security
Depends On: 1165204
Blocks: 1160648
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Reported: 2014-11-05 05:11 EST by Petr Matousek
Modified: 2014-11-18 09:45 EST (History)
6 users (show)

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Doc Type: Bug Fix
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Environment:
Last Closed: 2014-11-05 05:14:48 EST
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Petr Matousek 2014-11-05 05:11:49 EST 
The emulation of far branch instructions (CALL, JMP, and RETF in Intel
assembly syntax, LCALL, LJMP, and LRET in AT&T assembly syntax)
incompletely performs privilege checks.

Malicious HVM guest user mode code may be able to elevate its
privileges to guest supervisor mode, or to crash the guest.

Acknowledgements:

Red Hat would like to thank the Xen for reporting this issue.
Comment 3 Petr Matousek 2014-11-05 05:14:48 EST 
Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.
Comment 4 Vincent Danen 2014-11-18 09:44:42 EST 
External References:

http://xenbits.xen.org/xsa/advisory-110.html
Comment 5 Vincent Danen 2014-11-18 09:45:41 EST 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1165204]
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