[Ksplice][Ubuntu-Oracle-Updates] New Ksplice updates for Ubuntu OCI kernel (USN-5073-1)

[Oracle Ksplice]

Synopsis: USN-5073-1 can now be patched using Ksplice
CVEs: CVE-2021-34693 CVE-2021-3612 CVE-2021-3653 CVE-2021-3656 CVE-2021-38160

Systems running Ubuntu OCI kernel can now use Ksplice to patch against
the latest Ubuntu Security Notice, USN-5073-1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Ubuntu OCI
kernel 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-2021-34693: Information leak in CAN BCM message.

The header of a CAN bus BCM message contains uninitialized memory that
is transmitted over the wire. A malicious device might exploit this to
gain information about the running system.


* CVE-2021-3656, CVE-2021-3653: Privilege escalation in the AMD SVM L2 guests handling.

Multiple security bypasses potentially allow L2 guests to read/write host
physical memory.  An untrusted L1 guest running on certain AMD CPUs could
use these flaws to run with full ring zero privileges.


* CVE-2021-38160: Privileges escalation in virtio-console due to a buffer overflow.

A missing sanity check in the virtio-console functionality could allow
a console client to write corrupted data to the console and cause
a buffer overflow. A local user could use this flaw for a denial of
service or privileges escalation.


* CVE-2021-3612: Privilege escalation in joystick subsystem due to out-of-bounds write access.

Improper data validation in ioctls of joystick devices subsystem could
lead to out-of-bounds memory write access. A local user could use this
flaw to cause a denial-of-service or escalate their privileges.

SUPPORT

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