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

Synopsis:          Important: kernel security, bug fix, and enhancement update
Advisory ID:       RHSA-2017:0933-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:0933
Issue date:        2017-04-12
CVE Names:         CVE-2016-8650 CVE-2016-9793 CVE-2017-2618 
                   CVE-2017-2636 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.

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 Client (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

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

These updated kernel packages include several security issues and numerous
bug fixes. Space precludes documenting all of these bug fixes in this
advisory. To see the complete list of bug fixes, users are directed to the
related Knowledge Article: https://access.redhat.com/articles/2986951.

Security Fix(es):

* A race condition flaw was found in the N_HLDC Linux kernel driver when
accessing n_hdlc.tbuf list that can lead to double free. A local,
unprivileged user able to set the HDLC line discipline on the tty device
could use this flaw to increase their privileges on the system.
(CVE-2017-2636, Important)

* A flaw was found in the Linux kernel key management subsystem in which a
local attacker could crash the kernel or corrupt the stack and additional
memory (denial of service) by supplying a specially crafted RSA key. This
flaw panics the machine during the verification of the RSA key.
(CVE-2016-8650, Moderate)

* A flaw was found in the Linux kernel's implementation of setsockopt for
the SO_{SND|RCV}BUFFORCE setsockopt() system call. Users with non-namespace
CAP_NET_ADMIN are able to trigger this call and create a situation in which
the sockets sendbuff data size could be negative. This could adversely
affect memory allocations and create situations where the system could
crash or cause memory corruption. (CVE-2016-9793, Moderate)

* A flaw was found in the Linux kernel's handling of clearing SELinux
attributes on /proc/pid/attr files. An empty (null) write to this file can
crash the system by causing the system to attempt to access unmapped kernel
memory. (CVE-2017-2618, Moderate)

Red Hat would like to thank Alexander Popov for reporting CVE-2017-2636 and
Ralf Spenneberg for reporting CVE-2016-8650. The CVE-2017-2618 issue was
discovered by Paul Moore (Red Hat Engineering).

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/):

1395187 - CVE-2016-8650 kernel: Null pointer dereference via keyctl
1402013 - CVE-2016-9793 kernel: Signed overflow for SO_{SND|RCV}BUFFORCE
1419916 - CVE-2017-2618 kernel: Off-by-one error in selinux_setprocattr (/proc/self/attr/fscreate)
1428319 - CVE-2017-2636 kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release()

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
kernel-3.10.0-514.16.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.16.1.el7.noarch.rpm
kernel-doc-3.10.0-514.16.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.16.1.el7.x86_64.rpm
kernel-devel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-headers-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.16.1.el7.x86_64.rpm
perf-3.10.0-514.16.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.16.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
kernel-3.10.0-514.16.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.16.1.el7.noarch.rpm
kernel-doc-3.10.0-514.16.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.16.1.el7.x86_64.rpm
kernel-devel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-headers-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.16.1.el7.x86_64.rpm
perf-3.10.0-514.16.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.16.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
kernel-3.10.0-514.16.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.16.1.el7.noarch.rpm
kernel-doc-3.10.0-514.16.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-514.16.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-514.16.1.el7.ppc64.rpm
kernel-debug-3.10.0-514.16.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-514.16.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-514.16.1.el7.ppc64.rpm
kernel-devel-3.10.0-514.16.1.el7.ppc64.rpm
kernel-headers-3.10.0-514.16.1.el7.ppc64.rpm
kernel-tools-3.10.0-514.16.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-514.16.1.el7.ppc64.rpm
perf-3.10.0-514.16.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm
python-perf-3.10.0-514.16.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-debug-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-devel-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-headers-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-tools-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-514.16.1.el7.ppc64le.rpm
perf-3.10.0-514.16.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm
python-perf-3.10.0-514.16.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm

s390x:
kernel-3.10.0-514.16.1.el7.s390x.rpm
kernel-debug-3.10.0-514.16.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-514.16.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-514.16.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-514.16.1.el7.s390x.rpm
kernel-devel-3.10.0-514.16.1.el7.s390x.rpm
kernel-headers-3.10.0-514.16.1.el7.s390x.rpm
kernel-kdump-3.10.0-514.16.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-514.16.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-514.16.1.el7.s390x.rpm
perf-3.10.0-514.16.1.el7.s390x.rpm
perf-debuginfo-3.10.0-514.16.1.el7.s390x.rpm
python-perf-3.10.0-514.16.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.s390x.rpm

x86_64:
kernel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.16.1.el7.x86_64.rpm
kernel-devel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-headers-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.16.1.el7.x86_64.rpm
perf-3.10.0-514.16.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
kernel-debug-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-514.16.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-514.16.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-514.16.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.16.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
kernel-3.10.0-514.16.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.16.1.el7.noarch.rpm
kernel-doc-3.10.0-514.16.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.16.1.el7.x86_64.rpm
kernel-devel-3.10.0-514.16.1.el7.x86_64.rpm
kernel-headers-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.16.1.el7.x86_64.rpm
perf-3.10.0-514.16.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.16.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.16.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.16.1.el7.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-2016-8650
https://access.redhat.com/security/cve/CVE-2016-9793
https://access.redhat.com/security/cve/CVE-2017-2618
https://access.redhat.com/security/cve/CVE-2017-2636
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/articles/2986951

8. Contact:

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

Copyright 2017 Red Hat, Inc.
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