[El-errata] New Ksplice updates for Oracle Enhanced RHCK 5 (ELSA-2019-4732)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2019-4732 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-2019-4732.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2019-4732.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Oracle Enhanced
RHCK 5 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: 29821515

SUPPORT

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