[RHSA-2016:2124-01] 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-2016:2124-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-2124.html

Issue date: 2016-10-28

CVE Names: CVE-2016-1583 CVE-2016-5195

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1. Summary:

 

An update for kernel is now available for Red Hat Enterprise Linux 5.

 

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 (v. 5 server) - i386, ia64, noarch, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, 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)

 

* It was found that stacking a file system over procfs in the Linux kernel

could lead to a kernel stack overflow due to deep nesting, as demonstrated

by mounting ecryptfs over procfs and creating a recursion by mapping

/proc/environ. An unprivileged, local user could potentially use this flaw

to escalate their privileges on the system. (CVE-2016-1583, Important)

 

Red Hat would like to thank Phil Oester for reporting CVE-2016-5195.

 

Bug Fix(es):

 

* In some cases, a kernel crash or file system corruption occurred when

running journal mode 'ordered'. The kernel crash was caused by a null

pointer dereference due to a race condition between two journal functions.

The file system corruption occurred due to a race condition between the

do_get_write_access() function and buffer writeout. This update fixes both

race conditions. As a result, neither the kernel crash, nor the file system

corruption now occur. (BZ#1067708)

 

* Prior to this update, some Global File System 2 (GFS2) files had

incorrect time stamp values due to two problems with handling time stamps

of such files. The first problem concerned the atime time stamp, which

ended up with an arbitrary value ahead of the actual value, when a GFS2

file was accessed. The second problem was related to the mtime and ctime

time stamp updates, which got lost when a GFS2 file was written to from one

node and read from or written to from another node. With this update, a set

of patches has been applied that fix these problems. As a result, the time

stamps of GFS2 files are now handled correctly. (BZ#1374861)

 

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/):

 

1344721 - CVE-2016-1583 kernel: Stack overflow via ecryptfs and /proc/$pid/environ

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

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 5 client):

 

Source:

kernel-2.6.18-416.el5.src.rpm

 

i386:

kernel-2.6.18-416.el5.i686.rpm

kernel-PAE-2.6.18-416.el5.i686.rpm

kernel-PAE-debuginfo-2.6.18-416.el5.i686.rpm

kernel-PAE-devel-2.6.18-416.el5.i686.rpm

kernel-debug-2.6.18-416.el5.i686.rpm

kernel-debug-debuginfo-2.6.18-416.el5.i686.rpm

kernel-debug-devel-2.6.18-416.el5.i686.rpm

kernel-debuginfo-2.6.18-416.el5.i686.rpm

kernel-debuginfo-common-2.6.18-416.el5.i686.rpm

kernel-devel-2.6.18-416.el5.i686.rpm

kernel-headers-2.6.18-416.el5.i386.rpm

kernel-xen-2.6.18-416.el5.i686.rpm

kernel-xen-debuginfo-2.6.18-416.el5.i686.rpm

kernel-xen-devel-2.6.18-416.el5.i686.rpm

 

noarch:

kernel-doc-2.6.18-416.el5.noarch.rpm

 

x86_64:

kernel-2.6.18-416.el5.x86_64.rpm

kernel-debug-2.6.18-416.el5.x86_64.rpm

kernel-debug-debuginfo-2.6.18-416.el5.x86_64.rpm

kernel-debug-devel-2.6.18-416.el5.x86_64.rpm

kernel-debuginfo-2.6.18-416.el5.x86_64.rpm

kernel-debuginfo-common-2.6.18-416.el5.x86_64.rpm

kernel-devel-2.6.18-416.el5.x86_64.rpm

kernel-headers-2.6.18-416.el5.x86_64.rpm

kernel-xen-2.6.18-416.el5.x86_64.rpm

kernel-xen-debuginfo-2.6.18-416.el5.x86_64.rpm

kernel-xen-devel-2.6.18-416.el5.x86_64.rpm

 

Red Hat Enterprise Linux (v. 5 server):

 

Source:

kernel-2.6.18-416.el5.src.rpm

 

i386:

kernel-2.6.18-416.el5.i686.rpm

kernel-PAE-2.6.18-416.el5.i686.rpm

kernel-PAE-debuginfo-2.6.18-416.el5.i686.rpm

kernel-PAE-devel-2.6.18-416.el5.i686.rpm

kernel-debug-2.6.18-416.el5.i686.rpm

kernel-debug-debuginfo-2.6.18-416.el5.i686.rpm

kernel-debug-devel-2.6.18-416.el5.i686.rpm

kernel-debuginfo-2.6.18-416.el5.i686.rpm

kernel-debuginfo-common-2.6.18-416.el5.i686.rpm

kernel-devel-2.6.18-416.el5.i686.rpm

kernel-headers-2.6.18-416.el5.i386.rpm

kernel-xen-2.6.18-416.el5.i686.rpm

kernel-xen-debuginfo-2.6.18-416.el5.i686.rpm

kernel-xen-devel-2.6.18-416.el5.i686.rpm

 

ia64:

kernel-2.6.18-416.el5.ia64.rpm

kernel-debug-2.6.18-416.el5.ia64.rpm

kernel-debug-debuginfo-2.6.18-416.el5.ia64.rpm

kernel-debug-devel-2.6.18-416.el5.ia64.rpm

kernel-debuginfo-2.6.18-416.el5.ia64.rpm

kernel-debuginfo-common-2.6.18-416.el5.ia64.rpm

kernel-devel-2.6.18-416.el5.ia64.rpm

kernel-headers-2.6.18-416.el5.ia64.rpm

kernel-xen-2.6.18-416.el5.ia64.rpm

kernel-xen-debuginfo-2.6.18-416.el5.ia64.rpm

kernel-xen-devel-2.6.18-416.el5.ia64.rpm

 

noarch:

kernel-doc-2.6.18-416.el5.noarch.rpm

 

ppc:

kernel-2.6.18-416.el5.ppc64.rpm

kernel-debug-2.6.18-416.el5.ppc64.rpm

kernel-debug-debuginfo-2.6.18-416.el5.ppc64.rpm

kernel-debug-devel-2.6.18-416.el5.ppc64.rpm

kernel-debuginfo-2.6.18-416.el5.ppc64.rpm

kernel-debuginfo-common-2.6.18-416.el5.ppc64.rpm

kernel-devel-2.6.18-416.el5.ppc64.rpm

kernel-headers-2.6.18-416.el5.ppc.rpm

kernel-headers-2.6.18-416.el5.ppc64.rpm

kernel-kdump-2.6.18-416.el5.ppc64.rpm

kernel-kdump-debuginfo-2.6.18-416.el5.ppc64.rpm

kernel-kdump-devel-2.6.18-416.el5.ppc64.rpm

 

s390x:

kernel-2.6.18-416.el5.s390x.rpm

kernel-debug-2.6.18-416.el5.s390x.rpm

kernel-debug-debuginfo-2.6.18-416.el5.s390x.rpm

kernel-debug-devel-2.6.18-416.el5.s390x.rpm

kernel-debuginfo-2.6.18-416.el5.s390x.rpm

kernel-debuginfo-common-2.6.18-416.el5.s390x.rpm

kernel-devel-2.6.18-416.el5.s390x.rpm

kernel-headers-2.6.18-416.el5.s390x.rpm

kernel-kdump-2.6.18-416.el5.s390x.rpm

kernel-kdump-debuginfo-2.6.18-416.el5.s390x.rpm

kernel-kdump-devel-2.6.18-416.el5.s390x.rpm

 

x86_64:

kernel-2.6.18-416.el5.x86_64.rpm

kernel-debug-2.6.18-416.el5.x86_64.rpm

kernel-debug-debuginfo-2.6.18-416.el5.x86_64.rpm

kernel-debug-devel-2.6.18-416.el5.x86_64.rpm

kernel-debuginfo-2.6.18-416.el5.x86_64.rpm

kernel-debuginfo-common-2.6.18-416.el5.x86_64.rpm

kernel-devel-2.6.18-416.el5.x86_64.rpm

kernel-headers-2.6.18-416.el5.x86_64.rpm

kernel-xen-2.6.18-416.el5.x86_64.rpm

kernel-xen-debuginfo-2.6.18-416.el5.x86_64.rpm

kernel-xen-devel-2.6.18-416.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-2016-1583

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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