[Ksplice][Ubuntu-20.04-Updates] New Ksplice updates for Ubuntu 20.04 Focal (5.4.0-81.91)

[Oracle Ksplice]

Synopsis: 5.4.0-81.91 can now be patched using Ksplice
CVEs: CVE-2021-34693 CVE-2021-3564 CVE-2021-3587

Systems running Ubuntu 20.04 Focal can now use Ksplice to patch
against the latest Ubuntu kernel update, 5.4.0-81.91.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Ubuntu 20.04
Focal 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-2021-3564: Use-after-free when initializing bluetooth HCI device.

A flaw in the bluetooth Host Controller Interface handling could result
in a use-after-free if a device fails initialization. A malicious local
device or user might exploit this to cause a denial-of-service.


* CVE-2021-3587: Denial-of-service when calling sockname() on NFC socket.

If an NFC socket fails to bind, calling getsockname() will result in a
NULL pointer deference. A local, unprivileged user might exploit this to
cause a denial-of-service.


* 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.

SUPPORT

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