[El-errata] New Ksplice updates for UEKR4 4.1.12 on OL6 and OL7 (ELSA-2021-9346)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2021-9346 can now be patched using Ksplice
CVEs: CVE-2020-12352 CVE-2020-36386 CVE-2021-31916 CVE-2021-33034

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2021-9346.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2021-9346.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running UEKR4 4.1.12 on
OL6 and 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-2021-31916: Out-Of-Bounds memory write in Device Mapper subsystem.

A logic error whilst listing devices may cause an out-of-bounds memory
write.  An attacker with CAP_SYS_ADMIN permissions could use this to
cause a denial-of-service.

Orabug: 32860494


* CVE-2020-12352: Information leak when handling AMP packets in Bluetooth stack.

A missing zeroing of stack memory when handling AMP packets in Bluetooth
stack could lead to an information leak. A remote attacker could use this
flaw to leak information about running kernel and facilitate an attack.

Orabug: 32021289


* CVE-2020-36386: Out-of-bounds read in Bluetooth HCI event subsystem.

Insufficient packet validation in the Bluetooth Host Controller Interface
event packet handler can cause out-of-bounds reads with a potential for
denial-of-service or leaking of privileged data.

Orabug: 33013890


* CVE-2021-33034: Use-after-free when tearing down bluetooth HCI channel.

A race condition in the bluetooth Host Controller Interface code could
result in a use-after-free. A malicious device might exploit this to
write data to an arbitrary kernel address, potentially allowing code
execution under control of the device.

Orabug: 32912103


* Improve Machine Check Exception handling.

On Machine Check Exception, collect error data in crashdump.

Orabug: 32820278

SUPPORT

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