Bug 1484476 – CVE-2017-15596 xsa235 xen: add-to-physmap error paths fail to release lock on ARM

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Bug 1484476 - (CVE-2017-15596) CVE-2017-15596 xsa235 xen: add-to-physmap error paths fail to release lock on ARM

Summary:	CVE-2017-15596 xsa235 xen: add-to-physmap error paths fail to release lock on...

Status:	NEW

Aliases:	CVE-2017-15596

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=low,public=20170823,reported=2...
Keywords:	Security

Depends On:	1503678
Blocks:
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Reported:	2017-08-23 13:14 EDT by Pedro Sampaio
Modified:	2017-10-18 10:41 EDT (History)
CC List:	12 users (show)

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Description Pedro Sampaio 2017-08-23 13:14:12 EDT

When dealing with the grant map space of add-to-physmap operations,
ARM specific code recognizes a number of error conditions, but fails
to release a lock being held on the respective exit paths.

A malicious guest administrator can cause a denial of service.
Specifically, prevent use of a physical CPU for an indefinite period
of time.

Upstream patch:

http://seclists.org/oss-sec/2017/q3/att-341/xsa235.patch

References:

http://seclists.org/oss-sec/2017/q3/341

Comment 1 Pedro Sampaio 2017-08-23 13:18:29 EDT

Only affects ARM architectures.

Comment 3 Adam Mariš 2017-10-18 10:28:20 EDT

External References:

https://xenbits.xen.org/xsa/advisory-235.html

Comment 4 Adam Mariš 2017-10-18 10:30:18 EDT

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1503678]

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