medium
4.9
CWE
835 399
Advisory Published
CVE Published
CVE Published
Updated

CVE-2015-5307

First published: Mon Nov 02 2015(Updated: )

It was found that a guest can DoS a host by triggering an infinite loop in microcode. If a guest in 32-bit mode enabled alignment exceptions, puts the exception handler in ring 3, and then triggers an alignment exception with an unaligned stack, then the microcode will enter an infinite loop. Because there's no instruction boundary the core never receives another interrupt (including SMIs). The host kernel panics pretty quickly due to the effects. A privileged user inside guest could use this flaw to crash the host kernel resulting in DoS. Upstream KVM patch: ------------------- -&gt; <a href="http://permalink.gmane.org/gmane.linux.kernel/2082329">http://permalink.gmane.org/gmane.linux.kernel/2082329</a> References: ----------- -&gt; <a href="http://www.openwall.com/lists/oss-security/2015/11/10/1">http://www.openwall.com/lists/oss-security/2015/11/10/1</a>

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel<0:2.6.32-573.12.1.el6
0:2.6.32-573.12.1.el6
redhat/kernel<0:2.6.32-220.65.1.el6
0:2.6.32-220.65.1.el6
redhat/kernel<0:2.6.32-358.69.1.el6
0:2.6.32-358.69.1.el6
redhat/kernel<0:2.6.32-431.68.1.el6
0:2.6.32-431.68.1.el6
redhat/kernel<0:2.6.32-504.40.1.el6
0:2.6.32-504.40.1.el6
redhat/kernel<0:3.10.0-327.3.1.el7
0:3.10.0-327.3.1.el7
redhat/kernel<0:3.10.0-229.24.2.el7
0:3.10.0-229.24.2.el7
Linux Linux kernel<=4.2.3
Xen Xen=4.3.0
Xen Xen=4.3.1
Xen Xen=4.3.2
Xen Xen=4.3.3
Xen Xen=4.3.4
Xen Xen=4.4.0
Xen Xen=4.4.1
Xen Xen=4.4.2
Xen Xen=4.4.3
Xen Xen=4.4.4
Xen Xen=4.5.0
Xen Xen=4.5.1
Xen Xen=4.5.2
Xen Xen=4.5.3
Xen Xen=4.5.5
Xen Xen=4.6.0
Xen Xen=4.6.1
Xen Xen=4.6.2
Xen Xen=4.6.3
Xen Xen=4.6.4
Xen Xen=4.6.5
Xen Xen=4.6.6
Oracle VM VirtualBox>=4.0.0<=4.0.34
Oracle VM VirtualBox>=4.1.0<=4.1.42
Oracle VM VirtualBox>=4.2.0<=4.2.34
Oracle VM VirtualBox>=4.3.0<=4.3.29
Oracle VM VirtualBox>=5.0.0<=5.0.8
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=15.10

Remedy

http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html

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