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                   Red Hat Security Advisory

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2017:0091-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0091.html
Issue date:        2017-01-17
CVE Names:         CVE-2016-6828 CVE-2016-7117 CVE-2016-9555 
=====================================================================

1. Summary:

An update for kernel-rt 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 Realtime (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* A use-after-free vulnerability was found in the kernel's socket recvmmsg
subsystem. This may allow remote attackers to corrupt memory and may allow
execution of arbitrary code. This corruption takes place during the error
handling routines within __sys_recvmmsg() function. (CVE-2016-7117,
Important)

* A use-after-free vulnerability was found in tcp_xmit_retransmit_queue and
other tcp_* functions. This condition could allow an attacker to send an
incorrect selective acknowledgment to existing connections, possibly
resetting a connection. (CVE-2016-6828, Moderate)

* A flaw was found in the Linux kernel's implementation of sctp protocol in
which a remote attacker can trigger an out of bounds read with an offset of
up to 64kB. This may panic the machine with a page-fault. (CVE-2016-9555,
Moderate)

Bug Fix(es):

* The kernel-rt packages have been upgraded to the 3.10.0-514.6.1 source
tree, which provides a number of bug fixes over the previous version.
(BZ#1401863)

* Previously, the device mapper (DM) subsystem was not notified that the
real-time kernel changes the way preemption works with spinlocks. This
caused a kernel panic when the dm-multipath kernel module was loaded
because the interrupt request (IRQ) check was invalid on the real-time
kernel. This check has been corrected enabling the system to boot correctly
with the dm-multipath module enabled. (BZ#1400930)

* Unlike the standard Linux kernel, the real-time kernel does not disable
interrupts inside the Interrupt Service Routines driver. Because of this
difference, a New API (NAPI) function for turning interrupt requests (IRQ)
off was actually being called with IRQs enabled. Consequently, the NAPI
poll list was being corrupted, causing improper networking card operation
and potential kernel hangs. With this update, the NAPI function has been
corrected to force modifications of the poll list to be protected allowing
proper operation of the networking card drivers. (BZ#1402837)

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/):

1367091 - CVE-2016-6828 kernel: Use after free in tcp_xmit_retransmit_queue
1382268 - CVE-2016-7117 kernel: Use-after-free in the recvmmsg exit path
1397930 - CVE-2016-9555 kernel: Slab out-of-bounds access in sctp_sf_ootb()
1400930 - RT kernel panics with dm-multipath enabled
1401863 - kernel-rt: update to the RHEL7.3.z batch#2 source tree

6. Package List:

Red Hat Enterprise Linux for Real Time for NFV (v. 7):

Source:
kernel-rt-3.10.0-514.6.1.rt56.429.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-514.6.1.rt56.429.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debug-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-devel-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-trace-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-514.6.1.rt56.429.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-514.6.1.rt56.429.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debug-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-devel-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-trace-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-514.6.1.rt56.429.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-514.6.1.rt56.429.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-2016-6828
https://access.redhat.com/security/cve/CVE-2016-7117
https://access.redhat.com/security/cve/CVE-2016-9555
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

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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