Bug 649920 - (CVE-2010-3881) CVE-2010-3881 kvm: arch/x86/kvm/x86.c: reading uninitialized stack memory
CVE-2010-3881 kvm: arch/x86/kvm/x86.c: reading uninitialized stack memory
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
Unspecified Unspecified
low Severity low
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Assigned To: Red Hat Product Security
: Security
Depends On: 649832 649840 649929 649931
Blocks: Rhel6KvmTier1
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Reported: 2010-11-04 15:59 EDT by Petr Matousek
Modified: 2016-02-15 07:12 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Description Petr Matousek 2010-11-04 15:59:06 EDT
Description of problem:
Structures kvm_vcpu_events, kvm_debugregs, kvm_pit_state2 and kvm_clock_data are copied to userland with some padding and reserved fields unitialized.  It leads to leaking of contents of kernel stack memory.



Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.
Comment 1 Petr Matousek 2010-11-04 16:00:02 EDT

This issue did not affect the version of Linux kernel as shipped with Red Hat
Enterprise Linux 3, 4 and Red Hat Enterprise MRG as they did not include
support for Kernel-based Virtual Machine (KVM). A future kernel update in Red
Hat Enterprise Linux 5 may address this flaw.
Comment 3 Eugene Teo (Security Response) 2010-11-22 08:25:03 EST
Upstream commit:
Comment 4 errata-xmlrpc 2010-12-20 12:36:59 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2010:0998 https://rhn.redhat.com/errata/RHSA-2010-0998.html
Comment 5 errata-xmlrpc 2011-06-21 19:53:31 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.0.Z - Server Only

Via RHSA-2011:0883 https://rhn.redhat.com/errata/RHSA-2011-0883.html

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