Bug 949981 - (CVE-2013-1935) CVE-2013-1935 kernel: kvm: pv_eoi guest updates with interrupts disabled
CVE-2013-1935 kernel: kvm: pv_eoi guest updates with interrupts disabled
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20130610,repo...
: Security
Depends On: 906602 949985
Blocks: 949982 970962
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Reported: 2013-04-09 08:21 EDT by Petr Matousek
Modified: 2016-04-26 11:11 EDT (History)
23 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-06-10 17:58:40 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Petr Matousek 2013-04-09 08:21:40 EDT
A bug has been found in the way guest pv_eoi updates were handled before entering the guests. Upon synchronizing LAPIC to the guest's VAPIC,  kvm_write_guest_cached() (and thus copy_to_user()) could be called with interrupts disabled.

A local unprivileged user in the guest could potentially use this flaw to crash the host.
Comment 2 Petr Matousek 2013-04-09 08:33:59 EDT
Statement:

This issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.

This issue does not affect the versions of KVM package as shipped with Red Hat Enterprise Linux 5.
Comment 3 Murray McAllister 2013-06-07 03:21:57 EDT
Acknowledgements:

Red Hat would like to thank IBM for reporting this issue.
Comment 4 errata-xmlrpc 2013-06-10 16:49:43 EDT
This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2013:0907 https://rhn.redhat.com/errata/RHSA-2013-0907.html
Comment 5 errata-xmlrpc 2013-06-10 17:51:20 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0911 https://rhn.redhat.com/errata/RHSA-2013-0911.html

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