Ranjivost jezgre operacijskog sustava RHEL 7

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Red Hat Security Advisory

Synopsis: Moderate: kernel security and bug fix update
Advisory ID: RHSA-2016:1395-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1395
Issue date: 2016-07-12
CVE Names: CVE-2015-4170
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue and several bugs are
now available for Red Hat Enterprise Linux 7 Extended Update Support.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.1) – noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1) – x86_64
Red Hat Enterprise Linux Server EUS (v. 7.1) – noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.1) – ppc64, ppc64le, s390x, x86_64

3. Description:

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

Security fix:

* A flaw was discovered in the way the Linux kernel’s TTY subsystem handled
the tty shutdown phase. A local, unprivileged user could use this flaw to
cause denial of service on the system by holding a reference to the ldisc
lock during tty shutdown, causing a deadlock. (CVE-2015-4170, Moderate)

This update also fixes the following bugs:

* When Small Computer System Interface (SCSI) devices were removed or
deleted, a system crash could occur due to a race condition between listing
all SCSI devices and SCSI device removal. The provided patch ensures that
the starting node for the klist_iter_init_node() function is actually a
member of the list before using it. As a result, a system crash no longer
occurs in the described scenario. (BZ#1333402)

* When creating Virtual Functions (VF) on the ixgbe driver, the Media
Access Control (MAC) address for each VF could be random if not explicitly
set. When generating a random MAC address, it was possible to set the
address to zero. As a consequence, transmitted packets were discarded
without being sent, and the user was not able to access the network. The
provided patchset ensures that the VFs always end up with valid MAC
addresses. As a result, packets are now transmitted as expected, and the
user is able to access the network. (BZ#1335405)

* Under significant load, some applications such as logshifter could
generate bursts of log messages too large for the system logger to spool.
Due to a race condition, log messages from that application could then be
lost even after the log volume dropped to manageable levels. This update
fixes the kernel mechanism used to notify the transmitter end of the socket
used by the system logger that more space is available on the receiver
side, removing a race condition which previously caused the sender to stop
transmitting new messages and allowing all log messages to be processed
correctly. (BZ#1337602)

* When a USB serial driver was trying to acquire a line-discipline
reference, a lockdep warning could occur due to the tty ldisc semaphore
that was not fully initialized. With this update, a set of patches has been
backported from upstream that fix this bug and no warnings occur in the
aforementioned scenario. (BZ#1343554)

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1218879 – CVE-2015-4170 kernel: pty layer race condition on tty ldisc shutdown.

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.1):

Source:
kernel-3.10.0-229.38.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-229.38.1.el7.noarch.rpm
kernel-doc-3.10.0-229.38.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-229.38.1.el7.x86_64.rpm
kernel-debug-3.10.0-229.38.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-229.38.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.38.1.el7.x86_64.rpm
kernel-devel-3.10.0-229.38.1.el7.x86_64.rpm
kernel-headers-3.10.0-229.38.1.el7.x86_64.rpm
kernel-tools-3.10.0-229.38.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-229.38.1.el7.x86_64.rpm
perf-3.10.0-229.38.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1):

x86_64:
kernel-debug-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-229.38.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-229.38.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm
python-perf-3.10.0-229.38.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-229.38.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.1):

Source:
kernel-3.10.0-229.38.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-229.38.1.el7.noarch.rpm
kernel-doc-3.10.0-229.38.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-229.38.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-229.38.1.el7.ppc64.rpm
kernel-debug-3.10.0-229.38.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-229.38.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-229.38.1.el7.ppc64.rpm
kernel-devel-3.10.0-229.38.1.el7.ppc64.rpm
kernel-headers-3.10.0-229.38.1.el7.ppc64.rpm
kernel-tools-3.10.0-229.38.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-229.38.1.el7.ppc64.rpm
perf-3.10.0-229.38.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm

s390x:
kernel-3.10.0-229.38.1.el7.s390x.rpm
kernel-debug-3.10.0-229.38.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-229.38.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-229.38.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-229.38.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-229.38.1.el7.s390x.rpm
kernel-devel-3.10.0-229.38.1.el7.s390x.rpm
kernel-headers-3.10.0-229.38.1.el7.s390x.rpm
kernel-kdump-3.10.0-229.38.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-229.38.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-229.38.1.el7.s390x.rpm
perf-3.10.0-229.38.1.el7.s390x.rpm
perf-debuginfo-3.10.0-229.38.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-229.38.1.el7.s390x.rpm

Red Hat Enterprise Linux Server EUS (v. 7.1):

Source:
kernel-3.10.0-229.38.1.ael7b.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-229.38.1.ael7b.noarch.rpm
kernel-doc-3.10.0-229.38.1.ael7b.noarch.rpm

ppc64le:
kernel-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-bootwrapper-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-debug-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-devel-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-headers-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-tools-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-tools-libs-3.10.0-229.38.1.ael7b.ppc64le.rpm
perf-3.10.0-229.38.1.ael7b.ppc64le.rpm
perf-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm
python-perf-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.1):

ppc64:
kernel-debug-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-229.38.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-229.38.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm
python-perf-3.10.0-229.38.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-229.38.1.el7.ppc64.rpm

s390x:
kernel-debug-debuginfo-3.10.0-229.38.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-229.38.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-229.38.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-229.38.1.el7.s390x.rpm
perf-debuginfo-3.10.0-229.38.1.el7.s390x.rpm
python-perf-3.10.0-229.38.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-229.38.1.el7.s390x.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.1):

ppc64le:
kernel-debug-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-debug-devel-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-229.38.1.ael7b.ppc64le.rpm
perf-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.rpm
python-perf-3.10.0-229.38.1.ael7b.ppc64le.rpm
python-perf-debuginfo-3.10.0-229.38.1.ael7b.ppc64le.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-2015-4170
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

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