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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Oracle Issues Fix for Oracle Linux) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
SecurityTracker Alert ID:  1037211
SecurityTracker URL:  http://securitytracker.com/id/1037211
CVE Reference:   CVE-2016-5195   (Links to External Site)
Date:  Nov 4 2016
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Oracle Linux 6
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain root privileges on the target system.

A local user can a race condition in the kernel memory subsystem in the management of copy-on-write operations on read-only memory mappings to overwrite kernel memory and gain kernel-level privileges.

This vulnerability is being actively exploited.

Some demonstration exploit code is listed at:

https://github.com/dirtycow/dirtycow.github.io/wiki/PoCs

Impact:   A local user can obtain root privileges on the target system.
Solution:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2016-2105.html

Vendor URL:  linux.oracle.com/errata/ELSA-2016-2105.html (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Oct 22 2016 Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges



 Source Message Contents

Subject:  [El-errata] ELSA-2016-2105 Important: Oracle Linux 6 kernel security update

Oracle Linux Security Advisory ELSA-2016-2105

http://linux.oracle.com/errata/ELSA-2016-2105.html

The following updated rpms for Oracle Linux 6 have been uploaded to the 
Unbreakable Linux Network:

i386:
kernel-2.6.32-642.6.2.el6.i686.rpm
kernel-abi-whitelists-2.6.32-642.6.2.el6.noarch.rpm
kernel-debug-2.6.32-642.6.2.el6.i686.rpm
kernel-debug-devel-2.6.32-642.6.2.el6.i686.rpm
kernel-devel-2.6.32-642.6.2.el6.i686.rpm
kernel-doc-2.6.32-642.6.2.el6.noarch.rpm
kernel-firmware-2.6.32-642.6.2.el6.noarch.rpm
kernel-headers-2.6.32-642.6.2.el6.i686.rpm
perf-2.6.32-642.6.2.el6.i686.rpm
python-perf-2.6.32-642.6.2.el6.i686.rpm

x86_64:
kernel-2.6.32-642.6.2.el6.x86_64.rpm
kernel-abi-whitelists-2.6.32-642.6.2.el6.noarch.rpm
kernel-debug-2.6.32-642.6.2.el6.x86_64.rpm
kernel-debug-devel-2.6.32-642.6.2.el6.i686.rpm
kernel-debug-devel-2.6.32-642.6.2.el6.x86_64.rpm
kernel-devel-2.6.32-642.6.2.el6.x86_64.rpm
kernel-doc-2.6.32-642.6.2.el6.noarch.rpm
kernel-firmware-2.6.32-642.6.2.el6.noarch.rpm
kernel-headers-2.6.32-642.6.2.el6.x86_64.rpm
perf-2.6.32-642.6.2.el6.x86_64.rpm
python-perf-2.6.32-642.6.2.el6.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol6/SRPMS-updates/kernel-2.6.32-642.6.2.el6.src.rpm



Description of changes:

[2.6.32-642.6.2.el6]
- [mm] close FOLL MAP_PRIVATE race (Larry Woodman) [1385116 1385117] 
{CVE-2016-5195}



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