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AUSCERT External Security Bulletin Redistribution
Important: kernel-rt security and bug fix update
9 August 2017
AusCERT Security Bulletin Summary
Product: Linux kernel
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Existing Account
CVE Names: CVE-2017-2647 CVE-2016-10200 CVE-2015-8970
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Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2017:2444-01
Product: Red Hat Enterprise MRG for RHEL-6
Advisory URL: https://access.redhat.com/errata/RHSA-2017:2444
Issue date: 2017-08-08
CVE Names: CVE-2015-8970 CVE-2016-10200 CVE-2017-2647
An update for kernel-rt is now available for Red Hat Enterprise MRG 2.
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:
MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.
* A use-after-free flaw was found in the Linux kernel which enables a race
condition in the L2TPv3 IP Encapsulation feature. A local user could use
this flaw to escalate their privileges or crash the system.
* A flaw was found that can be triggered in keyring_search_iterator in
keyring.c if type->match is NULL. A local user could use this flaw to crash
the system or, potentially, escalate their privileges. (CVE-2017-2647,
* The lrw_crypt() function in 'crypto/lrw.c' in the Linux kernel before 4.5
allows local users to cause a system crash and a denial of service by the
NULL pointer dereference via accept(2) system call for AF_ALG socket
without calling setkey() first to set a cipher key. (CVE-2015-8970,
Red Hat would like to thank Igor Redko (Virtuozzo) and Andrey Ryabinin
(Virtuozzo) for reporting CVE-2017-2647 and Igor Redko (Virtuozzo) and
Vasily Averin (Virtuozzo) for reporting CVE-2015-8970.
* Writing model-specific register (MSR) registers during intel_idle
initialization could previously cause exceptions. Consequently, a kernel
panic occurred during this initialization. The function call to write to
the MSR with
exception handling was modified to use wrmsrl_safe() instead of wrmsrl().
In this scenario, the kernel no longer panics. (BZ#1447438)
* The ixgbe driver was using incorrect bitwise operations on received PTP
flags. Consequently, systems that were using the ixgbe driver could not
synchronize time using PTP. The provided patch corrected the bitwise
operations on received PTP flags allowing these system to correctly
synchronize time using PTP. (BZ#1469795) (BZ#1451821)
The kernel-rt packages have been upgraded to version 3.10.0-514.rt56.230,
which provides a number of security and bug fixes over the previous
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
The system must be rebooted for this update to take effect.
5. Bugs fixed (https://bugzilla.redhat.com/):
1386286 - CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref
1428353 - CVE-2017-2647 kernel: Null pointer dereference in search_keyring
1430347 - CVE-2016-10200 kernel: l2tp: Race condition in the L2TPv3 IP encapsulation feature
1437675 - ftrace: pull upstream commits for correct selftest operation
1463427 - update the MRG 2.5.z 3.10 kernel-rt sources
6. Package List:
MRG Realtime for RHEL 6 Server v.2:
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <email@example.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2017 Red Hat, Inc.
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