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Bug 1140254 - (CVE-2014-7154) CVE-2014-7154 kernel: xen: Race condition in HVMOP_track_dirty_vram (XSA-104)
CVE-2014-7154 kernel: xen: Race condition in HVMOP_track_dirty_vram (XSA-104)
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20140923,repor...
: Security
Depends On: 1145736
Blocks: 1140259
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Reported: 2014-09-10 11:13 EDT by Petr Matousek
Modified: 2014-09-24 06:34 EDT (History)
8 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2014-09-10 11:17:46 EDT
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Petr Matousek 2014-09-10 11:13:18 EDT 
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 11:17:46 EDT 
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 11:21:55 EDT 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1145736]
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