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

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2017:2704-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2704
Issue date:        2017-09-13
CVE Names:         CVE-2017-1000251 
=====================================================================

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 stack buffer overflow flaw was found in the way the Bluetooth subsystem
of the Linux kernel processed pending L2CAP configuration responses from a
client. On systems with the stack protection feature enabled in the kernel
(CONFIG_CC_STACKPROTECTOR=y, which is enabled on all architectures other
than s390x and ppc64[le]), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to crash the
system. Due to the nature of the stack protection feature, code execution
cannot be fully ruled out, although we believe it is unlikely. On systems
without the stack protection feature (ppc64[le]; the Bluetooth modules are
not built on s390x), an unauthenticated attacker able to initiate a
connection to a system via Bluetooth could use this flaw to remotely
execute arbitrary code on the system with ring 0 (kernel) privileges.
(CVE-2017-1000251, Important)

Red Hat would like to thank Armis Labs for reporting this issue.

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/):

1489716 - CVE-2017-1000251 kernel: stack buffer overflow in the native Bluetooth stack

6. Package List:

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

Source:
kernel-rt-3.10.0-693.2.2.rt56.623.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-693.2.2.rt56.623.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-693.2.2.rt56.623.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-693.2.2.rt56.623.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-devel-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.2.2.rt56.623.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.2.2.rt56.623.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-2017-1000251
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/CVE-2017-1000251

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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