[El-errata] New Ksplice updates for UEKR5 4.14.35 on OL7 (ELSA-2020-5526)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2020-5526 can now be patched using Ksplice
CVEs: CVE-2019-19332 CVE-2019-3016

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2020-5526.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2020-5526.html

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-2019-3016: Privilege escalation in KVM guest paravirtualized TLB flushes.

A race condition when performing a paravirtualized TLB flush could
result in stale mappings in a KVM guest potentially allowing processes
access to pages from other processes.  A local unprivileged user could
use this flaw to crash the system or potentially, escalate privileges.

Orabug: 30489861


* Improved fix to CVE-2019-3016: Privilege escalation in KVM guest paravirtualized TLB flushes.

The original fix for CVE-2019-3016 did not cover all race conditions
which could result in a missing TLB flush and access to incorrect pages.

Orabug: 30489861, 30758028


* CVE-2019-19332: Denial-of-service in KVM cpuid emulation reporting.

A failure to correctly validate a request for KVM cpuid emulation
information a can lead to an out-of-bounds memory access, leading to a
kernel crash. A local user with the ability to use KVM could use this
flaw to cause a denial-of-service.


* Missing Non Maskable Interrupts on AMD KVM guests.

A logic error when handling NMI injection could result on failure to
deliver the NMI to the guest.  This could result in missing guest events
or a system hang.

Orabug: 30714532

SUPPORT

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