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 Kernel<=4.2.3
Xen xen-unstable=4.3.0
Xen xen-unstable=4.3.1
Xen xen-unstable=4.3.2
Xen xen-unstable=4.3.3
Xen xen-unstable=4.3.4
Xen xen-unstable=4.4.0
Xen xen-unstable=4.4.1
Xen xen-unstable=4.4.2
Xen xen-unstable=4.4.3
Xen xen-unstable=4.4.4
Xen xen-unstable=4.5.0
Xen xen-unstable=4.5.1
Xen xen-unstable=4.5.2
Xen xen-unstable=4.5.3
Xen xen-unstable=4.5.5
Xen xen-unstable=4.6.0
Xen xen-unstable=4.6.1
Xen xen-unstable=4.6.2
Xen xen-unstable=4.6.3
Xen xen-unstable=4.6.4
Xen xen-unstable=4.6.5
Xen xen-unstable=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=7.0
Debian=8.0
Ubuntu=12.04
Ubuntu=14.04
Ubuntu=15.10

Remedy

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

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2015-5307?

    CVE-2015-5307 is considered a high severity vulnerability due to its potential for a denial of service attack.

  • How do I fix CVE-2015-5307?

    To fix CVE-2015-5307, you should upgrade to the kernel versions specified in the remedy section, such as 0:2.6.32-573.12.1.el6 or later.

  • Which systems are affected by CVE-2015-5307?

    CVE-2015-5307 affects various versions of Linux kernels, Xen hypervisors, and Oracle VM VirtualBox.

  • Can CVE-2015-5307 be exploited remotely?

    Yes, CVE-2015-5307 can be exploited by an attacker with access to the guest system, leading to denial of service on the host.

  • What type of threat does CVE-2015-5307 pose?

    CVE-2015-5307 poses a threat of denial of service due to an infinite loop triggered in the microcode.

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