El-errata: New Ksplice updates for RHCK 6 (ELSA-2021-9212)

Synopsis: ELSA-2021-9212 can now be patched using Ksplice
CVEs: CVE-2020-29661 CVE-2021-20265 CVE-2021-27364 CVE-2021-27365

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2021-9212.
More information about this errata can be found at
  https://linux.oracle.com/errata/ELSA-2021-9212.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running RHCK 6 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-2021-20265: Memory leak when reading from AF_UNIX socket.

Incorrect reference counting when reading from AF_UNIX can trigger a
memory leak when a signal is delivered to a process.

* CVE-2020-29661: Use-after-free in ioctls of TTY subsystem.

A locking flaw in ioctls of TTY subsystem could lead to a use-after-free.
A local user could use this flaw to cause execution of arbitrary code or
a denial-of-service.

* CVE-2021-27364, CVE-2021-27365: Privilege escalation in iSCSI subsystem.

Multiple logic errors failing to check some messages and sysfs
attribute sizes may cause a buffer overflow. A local attacker could
use this to cause a privilege escalation.

Orabug: 32809880

SUPPORT

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