[Ksplice][Ubuntu-20.04-Updates] New Ksplice updates for Ubuntu 20.04 Focal (USN-6317-1)

[Oracle Ksplice]

Synopsis: USN-6317-1 can now be patched using Ksplice
CVEs: CVE-2022-40982 CVE-2023-20593 CVE-2023-3609 CVE-2023-3611 CVE-2023-3776

Systems running Ubuntu 20.04 Focal can now use Ksplice to patch
against the latest Ubuntu Security Notice, USN-6317-1.

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-2023-3609: Privilege escalation in U32 network packet classifier.

Incorrect reference counter handling in the network packet scheduler when
classifying using Universal 32-bit comparisons with hashing can lead to
use-after-free. This can allow a local user to trigger privilege escalation.


* CVE-2023-3776: Privilege escalation in Netfilter mark (FW) network packet classifier.

Incorrect reference counter handling in the network packet scheduler when
classifying using netfilter/firewall marks can lead to use-after-free.
This can allow a local user to trigger privilege escalation.


* CVE-2023-3611: Privilege escalation in Quick Fair Queueing network scheduler.

Insufficient bounds checks in the Quick Fair Queueing network scheduler can
lead to an out-of-bounds write. A local user can exploit this vulnerability
to trigger a denial-of-service or privilege escalation.


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

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


* Note: Oracle will not provide a zero-downtime update for CVE-2022-40982.

The fix for this CVE on systems running Ubuntu Focal 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 at oracle.com.