[RHSA-2016:2132-01] Important: kernel security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Important: kernel security and bug fix update

Advisory ID: RHSA-2016:2132-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-2132.html

Issue date: 2016-11-01

CVE Names: CVE-2016-5195

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1. Summary:

 

An update for kernel is now available for Red Hat Enterprise Linux 6.2

Advanced Update Support.

 

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 Server AUS (v. 6.2) - noarch, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.2) - 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.

 

Bug Fix(es):

 

* Previously, the BUG_ON() signal appeared in the fs_clear_inode() function

where the nfs_have_writebacks() function reported a positive value for

nfs_inode->npages. As a consequence, a kernel panic occurred. The provided

patch performs a serialization by holding the inode i_lock over the check

of PagePrivate and locking the request, which fixes this bug. (BZ#1365157)

 

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 Server AUS (v. 6.2):

 

Source:

kernel-2.6.32-220.68.1.el6.src.rpm

 

noarch:

kernel-doc-2.6.32-220.68.1.el6.noarch.rpm

kernel-firmware-2.6.32-220.68.1.el6.noarch.rpm

 

x86_64:

kernel-2.6.32-220.68.1.el6.x86_64.rpm

kernel-debug-2.6.32-220.68.1.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm

kernel-debug-devel-2.6.32-220.68.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-220.68.1.el6.x86_64.rpm

kernel-devel-2.6.32-220.68.1.el6.x86_64.rpm

kernel-headers-2.6.32-220.68.1.el6.x86_64.rpm

perf-2.6.32-220.68.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional AUS (v. 6.2):

 

Source:

kernel-2.6.32-220.68.1.el6.src.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-220.68.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-220.68.1.el6.x86_64.rpm

python-perf-2.6.32-220.68.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-220.68.1.el6.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

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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