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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2018:3822-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:3822
Issue date:        2018-12-12
CVE Names:         CVE-2017-8824 CVE-2017-11176 CVE-2017-15265
====================================================================
1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 5
Extended Lifecycle 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 (v. 5 ELS) - i386, noarch, s390x, x86_64

3. Description:

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

Security Fix(es):

* kernel: Use-after-free vulnerability in DCCP socket (CVE-2017-8824)

* kernel: Use-after-free in sys_mq_notify() (CVE-2017-11176)

* kernel: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank Mohamed Ghannam for reporting CVE-2017-8824.

Bug Fix(es):

* Previously, on certain Intel 64 systems, the microcode contained a new
model-specific register (MSR) that was not present in the older microcode
running on CPUs that had not been updated yet. As a consequence, the system
crashed due to a general protection fault on a CPU running the older
microcode. This update fixes the bug by having the kernel use MSR access
routines that handle the general protection fault. As a result, the system
no longer crashes in the described scenario. (BZ#1651481)

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/):

1470659 - CVE-2017-11176 kernel: Use-after-free in sys_mq_notify()
1501878 - CVE-2017-15265 kernel: Use-after-free in snd_seq_ioctl_create_port()
1519591 - CVE-2017-8824 kernel: Use-after-free vulnerability in DCCP socket

6. Package List:

Red Hat Enterprise Linux Server (v. 5 ELS):

Source:
kernel-2.6.18-436.el5.src.rpm

i386:
kernel-2.6.18-436.el5.i686.rpm
kernel-PAE-2.6.18-436.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-436.el5.i686.rpm
kernel-PAE-devel-2.6.18-436.el5.i686.rpm
kernel-debug-2.6.18-436.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-436.el5.i686.rpm
kernel-debug-devel-2.6.18-436.el5.i686.rpm
kernel-debuginfo-2.6.18-436.el5.i686.rpm
kernel-debuginfo-common-2.6.18-436.el5.i686.rpm
kernel-devel-2.6.18-436.el5.i686.rpm
kernel-headers-2.6.18-436.el5.i386.rpm
kernel-xen-2.6.18-436.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-436.el5.i686.rpm
kernel-xen-devel-2.6.18-436.el5.i686.rpm

noarch:
kernel-doc-2.6.18-436.el5.noarch.rpm

s390x:
kernel-2.6.18-436.el5.s390x.rpm
kernel-debug-2.6.18-436.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-436.el5.s390x.rpm
kernel-debug-devel-2.6.18-436.el5.s390x.rpm
kernel-debuginfo-2.6.18-436.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-436.el5.s390x.rpm
kernel-devel-2.6.18-436.el5.s390x.rpm
kernel-headers-2.6.18-436.el5.s390x.rpm
kernel-kdump-2.6.18-436.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-436.el5.s390x.rpm
kernel-kdump-devel-2.6.18-436.el5.s390x.rpm

x86_64:
kernel-2.6.18-436.el5.x86_64.rpm
kernel-debug-2.6.18-436.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-436.el5.x86_64.rpm
kernel-debug-devel-2.6.18-436.el5.x86_64.rpm
kernel-debuginfo-2.6.18-436.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-436.el5.x86_64.rpm
kernel-devel-2.6.18-436.el5.x86_64.rpm
kernel-headers-2.6.18-436.el5.x86_64.rpm
kernel-xen-2.6.18-436.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-436.el5.x86_64.rpm
kernel-xen-devel-2.6.18-436.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-2017-8824
https://access.redhat.com/security/cve/CVE-2017-11176
https://access.redhat.com/security/cve/CVE-2017-15265
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 2018 Red Hat, Inc.
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