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

Synopsis:          Important: kernel-alt security and bug fix update
Advisory ID:       RHSA-2018:1374-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1374
Issue date:        2018-05-14
CVE Names:         CVE-2018-1000199 
=====================================================================

1. Summary:

An update for kernel-alt 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 for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, noarch, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le

3. Description:

The kernel-alt packages provide the Linux kernel version 4.x.

Security Fix(es):

* kernel: ptrace() incorrect error handling leads to corruption and DoS
(CVE-2018-1000199)

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.

Red Hat would like to thank Andy Lutomirski for reporting this issue.

Bug Fix(es):

* Previously, the nfs_commit_inode() function did not respect the
FLUSH_SYNC argument and exited even if there were already the in-flight
COMMIT requests. As a consequence, the mmap() system call occasionally
returned the EBUSY error on NFS, and CPU soft lockups occurred during a
writeback on NFS. This update fixes nfs_commit_inode() to respect
FLUSH_SYNC. As a result, mmap() does not return EBUSY, and the CPU soft
lockups no longer occur during NFS writebacks. (BZ#1559869)

* Recent IBM z Systems hardware contains an extension to the time-of-day
clock that ensures it will be operational after the year 2042 by avoiding
an overflow that would happen without it. However, the KVM hypervisor was
previously unable to handle the extension correctly, which lead to guests
freezing if their kernel supported the time-of-day clock extension. This
update adds support for the extension to the KVM hypervisor, and KVM guests
which support it no longer freeze. (BZ#1559871)

* This update provides the ability to disable the "RFI Flush" mitigation
mechanism for the Meltdown vulnerability (CVE-2017-5754) in the kernel. The
patches that mitigate the effect of Meltdown may have negative impact on
performance when the mechanism they provide is enabled, and at the same
time your systems may not need this mitigation if they are secured by other
means. The vulnerability mitigation remains enabled by default and must be
disabled manually; this restores system performance to original levels, but
the system then also remains vulnerable to Meltdown. Instructions
describing how to disable RFI Flush, as well as additional information, is
provided in the following Red Hat Knowledgebase article:
https://access.redhat.com/articles/3311301 (BZ#1561463)

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/):

1568477 - CVE-2018-1000199 kernel: ptrace() incorrect error handling leads to corruption and DoS

6. Package List:

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
kernel-alt-4.14.0-49.2.2.el7a.src.rpm

aarch64:
kernel-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-debug-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-debug-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-debug-devel-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-devel-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-headers-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-tools-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-tools-libs-4.14.0-49.2.2.el7a.aarch64.rpm
perf-4.14.0-49.2.2.el7a.aarch64.rpm
perf-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm
python-perf-4.14.0-49.2.2.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm

noarch:
kernel-abi-whitelists-4.14.0-49.2.2.el7a.noarch.rpm
kernel-doc-4.14.0-49.2.2.el7a.noarch.rpm

ppc64le:
kernel-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-bootwrapper-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-debug-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-debug-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-devel-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-headers-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-tools-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-tools-libs-4.14.0-49.2.2.el7a.ppc64le.rpm
perf-4.14.0-49.2.2.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm
python-perf-4.14.0-49.2.2.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm

s390x:
kernel-4.14.0-49.2.2.el7a.s390x.rpm
kernel-debug-4.14.0-49.2.2.el7a.s390x.rpm
kernel-debug-debuginfo-4.14.0-49.2.2.el7a.s390x.rpm
kernel-debug-devel-4.14.0-49.2.2.el7a.s390x.rpm
kernel-debuginfo-4.14.0-49.2.2.el7a.s390x.rpm
kernel-debuginfo-common-s390x-4.14.0-49.2.2.el7a.s390x.rpm
kernel-devel-4.14.0-49.2.2.el7a.s390x.rpm
kernel-headers-4.14.0-49.2.2.el7a.s390x.rpm
kernel-kdump-4.14.0-49.2.2.el7a.s390x.rpm
kernel-kdump-debuginfo-4.14.0-49.2.2.el7a.s390x.rpm
kernel-kdump-devel-4.14.0-49.2.2.el7a.s390x.rpm
perf-4.14.0-49.2.2.el7a.s390x.rpm
perf-debuginfo-4.14.0-49.2.2.el7a.s390x.rpm
python-perf-4.14.0-49.2.2.el7a.s390x.rpm
python-perf-debuginfo-4.14.0-49.2.2.el7a.s390x.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64:
kernel-debug-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm
kernel-tools-libs-devel-4.14.0-49.2.2.el7a.aarch64.rpm
perf-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-49.2.2.el7a.aarch64.rpm

noarch:
kernel-doc-4.14.0-49.2.2.el7a.noarch.rpm

ppc64le:
kernel-debug-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-debug-devel-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm
kernel-tools-libs-devel-4.14.0-49.2.2.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-49.2.2.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-49.2.2.el7a.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-2018-1000199
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/cve/CVE-2018-1000199
https://access.redhat.com/articles/3311301

8. Contact:

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

Copyright 2018 Red Hat, Inc.
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