Bug 1167951 (CVE-2014-9065, CVE-2014-9066, xsa114)

Summary: CVE-2014-9065 xen: p2m lock starvation (xsa114)
Product: [Other] Security Response Reporter: Petr Matousek <pmatouse>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: drjones, imammedo, jrusnack, mmcallis, pbonzini, rkrcmar, security-response-team, vkuznets
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2014-11-25 17:11:19 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 1167952    

Description Petr Matousek 2014-11-25 17:08:58 UTC 
The current read/write lock implementation is read-biased, which allows
a consistent stream of readers to starve writers indefinitely. There
are certain rwlocks where guests are capable of applying arbitrary read
pressure.

A malicious guest administrator can deny service to other tasks. If
the NMI watchdog is active, a timeout might be triggered, resulting in
a host crash.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 2 Petr Matousek 2014-11-25 17:11:19 UTC 
Statement:

Not vulnerable.

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