Bug 1140254 (CVE-2014-7154)

Summary:	CVE-2014-7154 kernel: xen: Race condition in HVMOP_track_dirty_vram (XSA-104)
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	drjones, imammedo, jrusnack, pbonzini, rkrcmar, security-response-team, vkaigoro, 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:	2014-09-10 15:17:46 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:	1145736
Bug Blocks:	1140259

Description Petr Matousek 2014-09-10 15:13:18 UTC

The routine controlling the setup of dirty video RAM tracking latches
the value of a pointer before taking the respective guarding lock, thus
making it possible for a stale pointer to be used by the time the lock
got acquired and the pointer gets dereferenced.

Malicious or buggy stub domain kernels or tool stacks otherwise living
outside of Domain0 can mount a denial of service attack which, if
successful, can affect the whole system.

Only domains controlling HVM guests can exploit this vulnerability.
(This includes domains providing hardware emulation services to HVM
guests.)

Acknowledgements:

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

Comment 2 Petr Matousek 2014-09-10 15:17:46 UTC

Statement:

Not vulnerable.

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

Comment 3 Petr Matousek 2014-09-23 15:21:55 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1145736]