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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Oracle Issues Fix for Oracle Linux for Linux Kernel) Xen I/O Port Access Missing PHYSDEVOP_set_iopl Hypercall Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1035434
SecurityTracker URL:  http://securitytracker.com/id/1035434
CVE Reference:   CVE-2016-3157   (Links to External Site)
Date:  Mar 29 2016
Impact:   Denial of service via local system, Disclosure of system information, Disclosure of user information, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Oracle Linux 6, 7
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the guest system. The Linux Kernel is affected.

A local user on the guest system can access I/O ports without proper permissions. As a result, the local user can cause the guest to crash, obtain potentially sensitive information from the guest system, or gain elevated privileges on the guest system.

The vulnerability is due to a missing hypercall (PHYSDEVOP_set_iopl).

x86-64 Linux systems configured as PV guests are affected.

x86 HVM guests are not affected.

32-bit Linux guests are not affected.

ARM systems are not affected.

Andy Lutomirski reported this vulnerability.

Impact:   A local user on the guest system can cause the guest to crash, obtain potentially sensitive information from the guest system, or gain elevated privileges on the guest system.
Solution:   Oracle has issued a fix for the Linux Kernel.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2016-3529.html

Vendor URL:  linux.oracle.com/errata/ELSA-2016-3529.html (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Mar 17 2016 Xen I/O Port Access Missing PHYSDEVOP_set_iopl Hypercall Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System



 Source Message Contents

Subject:  [El-errata] ELSA-2016-3529 Important: Oracle Linux 7 kernel-uek security update

Oracle Linux Security Advisory ELSA-2016-3529

http://linux.oracle.com/errata/ELSA-2016-3529.html

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

x86_64:
kernel-uek-doc-4.1.12-32.2.3.el7uek.noarch.rpm
kernel-uek-firmware-4.1.12-32.2.3.el7uek.noarch.rpm
kernel-uek-4.1.12-32.2.3.el7uek.x86_64.rpm
kernel-uek-devel-4.1.12-32.2.3.el7uek.x86_64.rpm
kernel-uek-debug-4.1.12-32.2.3.el7uek.x86_64.rpm
kernel-uek-debug-devel-4.1.12-32.2.3.el7uek.x86_64.rpm
dtrace-modules-4.1.12-32.2.3.el7uek-0.5.1-1.el7.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/kernel-uek-4.1.12-32.2.3.el7uek.src.rpm
http://oss.oracle.com/ol7/SRPMS-updates/dtrace-modules-4.1.12-32.2.3.el7uek-0.5.1-1.el7.src.rpm



Description of changes:

kernel-uek
[4.1.12-32.2.3.el7uek]
- rebuild bumping release

[4.1.12-32.2.2.el7uek]
- x86/iopl/64: properly context-switch IOPL on Xen PV (Andy Lutomirski) 
  [Orabug: 22997978]  {CVE-2016-3157}
- fs/hugetlbfs/inode.c: fix bugs in hugetlb_vmtruncate_list() (Mike 
Kravetz)  [Orabug: 22667863]


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