Bug 1172765 - (CVE-2014-8134) CVE-2014-8134 kernel: x86: espfix not working for 32-bit KVM paravirt guests
CVE-2014-8134 kernel: x86: espfix not working for 32-bit KVM paravirt guests
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20141205,reported=2...
: Security
Depends On: 1172767 1172769
Blocks: 1170693
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Reported: 2014-12-10 12:12 EST by Petr Matousek
Modified: 2016-05-11 03:27 EDT (History)
30 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that the espfix functionality does not work for 32-bit KVM paravirtualized guests. A local, unprivileged guest user could potentially use this flaw to leak kernel stack addresses.
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Last Closed: 2016-05-11 03:27:18 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2014-12-10 12:12:41 EST
It was found that espfix funcionality (when returning to userspace with a 16
bit stack, the CPU will not restore the high word of esp for us on executing
iret and thus potentially leaks kernel addresses; espfix fixes this) does not
work for 32-bit KVM paravirt guests.

A local unprivileged user could potentially use this flaw to leak kernel
stack addresses.

Proposed upstream patch:
http://www.spinics.net/lists/kvm/msg111458.html

Acknowledgements:

Red Hat would like to thank Andy Lutomirski for reporting this issue.
Comment 1 Petr Matousek 2014-12-10 12:13:17 EST
Statement:

This issue did not affect the Linux kernel packages as shipped with Red
Hat Enterprise Linux 5 and 7, and Red Hat Enterprise Linux MRG 2.
Comment 3 Petr Matousek 2014-12-10 12:14:47 EST
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1172769]
Comment 5 Fedora Update System 2014-12-21 01:36:34 EST
kernel-3.17.7-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2014-12-21 21:32:43 EST
kernel-3.17.7-300.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2015-01-05 02:34:46 EST
kernel-3.14.27-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 8 errata-xmlrpc 2016-05-10 18:06:11 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:0855 https://rhn.redhat.com/errata/RHSA-2016-0855.html

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