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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition Lets Local Users Obtain Elevated Privileges
SecurityTracker Alert ID:  1037148
SecurityTracker URL:  http://securitytracker.com/id/1037148
CVE Reference:   CVE-2016-5195   (Links to External Site)
Date:  Oct 31 2016
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 5.9
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:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-2126.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-2126.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:  [RHSA-2016:2126-01] Important: kernel security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2016:2126-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-2126.html
Issue date:        2016-10-31
CVE Names:         CVE-2016-5195 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 5.9 Long
Life.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Long Life (v. 5.9 server) - i386, ia64, noarch, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es):

* A race condition was found in the way the Linux kernel's memory subsystem
handled the copy-on-write (COW) breakage of private read-only memory
mappings. An unprivileged, local user could use this flaw to gain write
access to otherwise read-only memory mappings and thus increase their
privileges on the system. (CVE-2016-5195, Important)

Red Hat would like to thank Phil Oester for reporting this issue.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1384344 - CVE-2016-5195 kernel: mm: privilege escalation via MAP_PRIVATE COW breakage

6. Package List:

Red Hat Enterprise Linux Long Life (v. 5.9 server):

Source:
kernel-2.6.18-348.32.1.el5.src.rpm

i386:
kernel-2.6.18-348.32.1.el5.i686.rpm
kernel-PAE-2.6.18-348.32.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-348.32.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-348.32.1.el5.i686.rpm
kernel-debug-2.6.18-348.32.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-348.32.1.el5.i686.rpm
kernel-debug-devel-2.6.18-348.32.1.el5.i686.rpm
kernel-debuginfo-2.6.18-348.32.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-348.32.1.el5.i686.rpm
kernel-devel-2.6.18-348.32.1.el5.i686.rpm
kernel-headers-2.6.18-348.32.1.el5.i386.rpm
kernel-xen-2.6.18-348.32.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-348.32.1.el5.i686.rpm
kernel-xen-devel-2.6.18-348.32.1.el5.i686.rpm

ia64:
kernel-2.6.18-348.32.1.el5.ia64.rpm
kernel-debug-2.6.18-348.32.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-348.32.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-348.32.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-348.32.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-348.32.1.el5.ia64.rpm
kernel-devel-2.6.18-348.32.1.el5.ia64.rpm
kernel-headers-2.6.18-348.32.1.el5.ia64.rpm
kernel-xen-2.6.18-348.32.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-348.32.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-348.32.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-348.32.1.el5.noarch.rpm

x86_64:
kernel-2.6.18-348.32.1.el5.x86_64.rpm
kernel-debug-2.6.18-348.32.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-348.32.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-348.32.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-348.32.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-348.32.1.el5.x86_64.rpm
kernel-devel-2.6.18-348.32.1.el5.x86_64.rpm
kernel-headers-2.6.18-348.32.1.el5.x86_64.rpm
kernel-xen-2.6.18-348.32.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-348.32.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-348.32.1.el5.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-5195
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/2706661

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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