[El-errata] New Ksplice updates for UEKR5 4.14.35 on OL7 (ELSA-2019-4628)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2019-4628 can now be patched using Ksplice
CVEs: CVE-2018-12126 CVE-2018-12127 CVE-2018-12130 CVE-2019-11091

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2019-4628.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running UEKR5 4.14.35
on OL7 install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* CVE-2019-11091, CVE-2018-12126, CVE-2018-12130, CVE-2018-12127: Microarchitectural Data Sampling.

A hardware vulnerability on various Intel x86 processors can allow a process to
speculatively access privileged information stored in CPU microarchitectural
buffers. A local user or guest VM could use this flaw to learn information
about the host kernel or hypervisor and use this to facilitate a further
attack.

Updated microcode is required for the mitigation to be effective, please see
the output of /sys/devices/system/cpu/vulnerabilities/mds to determine whether
the microcode supports the mitigation.

This update does not mitigate the vulnerability when SMT is in use. SMT can be
disabled with the following command:

echo off > /sys/devices/system/cpu/smt/control

Orabug: 29526899, 29721835

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.