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

Synopsis:          Moderate: kernel security and bug fix update
Advisory ID:       RHSA-2019:0324-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2019:0324
Issue date:        2019-02-12
CVE Names:         CVE-2018-18397
====================================================================
1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.4
Extended Update Support.

Red Hat Product Security has rated this update as having a security impact
of Moderate. 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 ComputeNode EUS (v. 7.4) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, x86_64

3. Description:

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

Security Fix(es):

* kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Bug Fix(es):

* The timeout handling in the libfc.ko kernel module did not work
correctly. This was happening during certain steps of the Fibre Channel
login procedure, when the timeout handling was not synchronized with the
state of a partially offloaded Fibre Channel over Ethernet (FCoE) in the
lower-level driver. Consequently, the offloaded FCoE state was incorrect,
which led to I/O timeout errors until the SCSI error recovery issued a host
reset. This update fixes the bug by improving the libfc.ko error handling
during the fabric login. As a result, the fabric login errors are addressed
in time, without the I/O timeouts in the described scenario. (BZ#1655042)

* Symmetric Multi-Processing (SMP) or Non-Uniform Memory Access (NUMA)
systems in some cases experienced deadlocks during a task migration and
task wakeup operations. Consequently, the systems terminated unexpectedly
with the following message:

    NMI watchdog: Watchdog detected hard LOCKUP on <some CPU #>

This update fixes the bug by queueing the stopper thread to run after locks
are released. As a result, the deadlocks and the system crashes no longer
occur in the described scenario. (BZ#1667326)

Users of kernel are advised to upgrade to these updated packages, which fix
these bugs.

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/):

1641548 - CVE-2018-18397 kernel: userfaultfd bypasses tmpfs file permissions

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.4):

Source:
kernel-3.10.0-693.44.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.44.1.el7.noarch.rpm
kernel-doc-3.10.0-693.44.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.44.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.44.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.44.1.el7.x86_64.rpm
perf-3.10.0-693.44.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
python-perf-3.10.0-693.44.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4):

x86_64:
kernel-debug-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.44.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.4):

Source:
kernel-3.10.0-693.44.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.44.1.el7.noarch.rpm
kernel-doc-3.10.0-693.44.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-693.44.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-693.44.1.el7.ppc64.rpm
kernel-debug-3.10.0-693.44.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-693.44.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-693.44.1.el7.ppc64.rpm
kernel-devel-3.10.0-693.44.1.el7.ppc64.rpm
kernel-headers-3.10.0-693.44.1.el7.ppc64.rpm
kernel-tools-3.10.0-693.44.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-693.44.1.el7.ppc64.rpm
perf-3.10.0-693.44.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
python-perf-3.10.0-693.44.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-debug-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-devel-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-headers-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-tools-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-693.44.1.el7.ppc64le.rpm
perf-3.10.0-693.44.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
python-perf-3.10.0-693.44.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm

s390x:
kernel-3.10.0-693.44.1.el7.s390x.rpm
kernel-debug-3.10.0-693.44.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-693.44.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-693.44.1.el7.s390x.rpm
kernel-devel-3.10.0-693.44.1.el7.s390x.rpm
kernel-headers-3.10.0-693.44.1.el7.s390x.rpm
kernel-kdump-3.10.0-693.44.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-693.44.1.el7.s390x.rpm
perf-3.10.0-693.44.1.el7.s390x.rpm
perf-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
python-perf-3.10.0-693.44.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-693.44.1.el7.s390x.rpm

x86_64:
kernel-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.44.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.44.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.44.1.el7.x86_64.rpm
perf-3.10.0-693.44.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
python-perf-3.10.0-693.44.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.4):

ppc64:
kernel-debug-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-693.44.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-693.44.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-693.44.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.44.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.44.1.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-2018-18397
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/

Copyright 2019 Red Hat, Inc.
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