Bug 1160643 (CVE-2014-8595, xsa110)

Summary: CVE-2014-8595 kernel: xen: Missing privilege level checks in x86 emulation of far branches (xsa110)
Product: [Other] Security Response Reporter: Petr Matousek <pmatouse>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: drjones, imammedo, pbonzini, rkrcmar, security-response-team, vkuznets
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2014-11-05 10:14:48 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1165204    
Bug Blocks: 1160648    

Description Petr Matousek 2014-11-05 10:11:49 UTC
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.


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

Comment 3 Petr Matousek 2014-11-05 10:14:48 UTC

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 14:44:42 UTC
External References:


Comment 5 Vincent Danen 2014-11-18 14:45:41 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1165204]