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

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

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2016:2110-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2016:2110.html
Issue date:        2016-10-26
CVE Names:         CVE-2016-5195 CVE-2016-7039 
====================================================================
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 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)

* Linux kernel built with the 802.1Q/802.1ad VLAN(CONFIG_VLAN_8021Q) OR
Virtual eXtensible Local Area Network(CONFIG_VXLAN) with Transparent
Ethernet Bridging(TEB) GRO support, is vulnerable to a stack overflow
issue. It could occur while receiving large packets via GRO path; As an
unlimited recursion could unfold in both VLAN and TEB modules, leading to a
stack corruption in the kernel. (CVE-2016-7039, Important)

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

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/):

1375944 - CVE-2016-7039 kernel: remotely triggerable unbounded recursion in the vlan gro code leading to a kernel crash
1384344 - CVE-2016-5195 kernel: mm: privilege escalation via MAP_PRIVATE COW breakage

6. Package List:

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

Source:
kernel-rt-3.10.0-327.36.3.rt56.238.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-327.36.3.rt56.238.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debug-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-trace-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-327.36.3.rt56.238.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-327.36.3.rt56.238.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debug-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-trace-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-327.36.3.rt56.238.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-2016-5195
https://access.redhat.com/security/cve/CVE-2016-7039
https://access.redhat.com/security/updates/classification#important
https://access.redhat.com/security/vulnerabilities/DirtyCow

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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