New Ksplice updates for RHCK 8 (ELSA-2023-12839)

Synopsis: ELSA-2023-12839 can now be patched using Ksplice
CVEs: CVE-2023-20593 CVE-2023-3390

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2023-12839.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2023-12839.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running RHCK 8 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-2023-3390: Use-after-free in Netfilter nf_tables packet classification framework.

Incorrect error path handling with NFT_MSG_NEWRULE in the Netfilter
nf_tables packet classification framework can lead to a use-after-free.
This can allow a local unprivileged user to perform arbitrary access to
kernel memory and escalate privileges.

* Note: Oracle will not provide a zero-downtime fix for CVE-2023-20593.

The optimal fix for this CVE is a microcode update for affected CPUs.
Customers will need to upgrade the microcode on affected CPUs in order
to mitigate this vulnerability.

SUPPORT

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