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Red Hat Security Advisory 2016-0068-01

Red Hat Security Advisory 2016-0068-01
Posted Jan 26, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0068-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A use-after-free flaw was found in the way the Linux kernel's key management subsystem handled keyring object reference counting in certain error path of the join_session_keyring() function. A local, unprivileged user could use this flaw to escalate their privileges on the system.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2016-0728
MD5 | 90b1526b8906c2e2d3bc467d646aaefb

Red Hat Security Advisory 2016-0068-01

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

Synopsis: Important: kernel-rt security update
Advisory ID: RHSA-2016:0068-01
Product: Red Hat Enterprise MRG for RHEL-6
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0068.html
Issue date: 2016-01-26
CVE Names: CVE-2016-0728
=====================================================================

1. Summary:

Updated kernel-rt packages that fix one security issue are now available
for Red Hat Enterprise MRG 2.

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

2. Relevant releases/architectures:

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

3. Description:

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

* A use-after-free flaw was found in the way the Linux kernel's key
management subsystem handled keyring object reference counting in certain
error path of the join_session_keyring() function. A local, unprivileged
user could use this flaw to escalate their privileges on the system.
(CVE-2016-0728, Important)

Red Hat would like to thank the Perception Point research team for
reporting this issue.

All kernel-rt users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. The system must be
rebooted for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

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

1297475 - CVE-2016-0728 kernel: Possible use-after-free vulnerability in keyring facility

6. Package List:

MRG Realtime for RHEL 6 Server v.2:

Source:
kernel-rt-3.10.0-327.rt56.170.el6rt.src.rpm

noarch:
kernel-rt-doc-3.10.0-327.rt56.170.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-327.rt56.170.el6rt.noarch.rpm

x86_64:
kernel-rt-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-327.rt56.170.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-327.rt56.170.el6rt.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-2016-0728
https://access.redhat.com/security/updates/classification/#important

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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