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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Oracle Issues Fix for Oracle Linux for Linux Kernel) Xen Exception Handling Bugs Let Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034402
SecurityTracker URL:  http://securitytracker.com/id/1034402
CVE Reference:   CVE-2015-5307, CVE-2015-8104   (Links to External Site)
Updated:  Dec 11 2015
Original Entry Date:  Dec 11 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Oracle Linux 6, 7
Description:   Two vulnerabilities were reported in Xen. A local user on the guest system can cause denial of service conditions on the host system. The Linux Kernel is affected.

The processing of benign exceptions may result in an infinite loop in the CPU. A local user on the guest system can exploit this to cause denial of service conditions on the host system.

An alignment check exception may be triggered by a 32-bit guest [CVE-2015-5307].

A debug exception can be triggered [CVE-2015-8104].

ARM is not affected.

x86 PV VMs are not affected.

x86 CPUs from all manufacturers are affected.

Ben Serebrin from Google and Jan Beulich from SUSE reported these vulnerabilities.

Impact:   A local user on the guest system can cause denial of service conditions on the host system.
Solution:   Oracle has issued a fix for the Linux Kernel.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2015-3107.html

Vendor URL:  linux.oracle.com/errata/ELSA-2015-3107.html (Links to External Site)
Cause:   Exception handling error

Message History:   This archive entry is a follow-up to the message listed below.
Nov 10 2015 Xen Exception Handling Bugs Let Local Users on a Guest System Cause Denial of Service Conditions on the Host System



 Source Message Contents

Subject:  [El-errata] ELSA-2015-3107 Important: Oracle Linux 7 Unbreakable Enterprise kernel security update

Oracle Linux Security Advisory ELSA-2015-3107

http://linux.oracle.com/errata/ELSA-2015-3107.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:


x86_64:
kernel-uek-firmware-3.8.13-118.2.2.el7uek.noarch.rpm
kernel-uek-doc-3.8.13-118.2.2.el7uek.noarch.rpm
kernel-uek-3.8.13-118.2.2.el7uek.x86_64.rpm
kernel-uek-devel-3.8.13-118.2.2.el7uek.x86_64.rpm
kernel-uek-debug-devel-3.8.13-118.2.2.el7uek.x86_64.rpm
kernel-uek-debug-3.8.13-118.2.2.el7uek.x86_64.rpm
dtrace-modules-3.8.13-118.2.2.el7uek-0.4.5-3.el7.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/kernel-uek-3.8.13-118.2.2.el7uek.src.rpm
http://oss.oracle.com/ol7/SRPMS-updates/dtrace-modules-3.8.13-118.2.2.el7uek-0.4.5-3.el7.src.rpm



Description of changes:

kernel-uek
[3.8.13-118.2.2.el7uek]
- KVM: svm: unconditionally intercept #DB (Paolo Bonzini)  [Orabug: 
22333698]  {CVE-2015-8104}
- KVM: x86: work around infinite loop in microcode when #AC is delivered 
(Eric Northup)  [Orabug: 22333689]  {CVE-2015-5307} {CVE-2015-5307}
- KVM: x86: Defining missing x86 vectors (Nadav Amit)  [Orabug: 22333689]


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