[Ksplice][Ubuntu-20.04-Updates] New Ksplice updates for Ubuntu 20.04 Focal (USN-5116-1)

[Oracle Ksplice]

Synopsis: USN-5116-1 can now be patched using Ksplice
CVEs: CVE-2020-3702 CVE-2021-3732 CVE-2021-38198 CVE-2021-38205 CVE-2021-40490 CVE-2021-42008

Systems running Ubuntu 20.04 Focal can now use Ksplice to patch
against the latest Ubuntu Security Notice, USN-5116-1.

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-2021-40490: Race condition in ext4 subsystem.

A logic error in the ext4 subsystem may lead to a race condition. This
may allow a local attacker to undermine system integrity and possibly
execute arbitrary code.


* CVE-2021-3732: Information disclosure in OverlayFS when mounting a filesystem.

A logic flaw in mounting functionality of OverlayFS subsystem could
allow an unprivileged local user with permissions to mount a filesystem
to access hidden files that should not be accessible in the original mount.
An unprivileged local attacker could use this flaw for information
disclosure.


* CVE-2021-38198: Denial-of-service when using shadow paging with KVM guests.

A missing check when using shadow paging with KVM guests could lead to a
page fault. A local attacker could use this flaw to cause a denial-of-
service.


* CVE-2021-42008: Out-of-bounds access in Serial port 6PACK driver.

A missing validation check flaw in data decoding of the Serial port
6PACK driver could lead to out-of-bounds writing. A local privileged
user could use this flaw to cause a denial-of-service or execute
arbitrary code.


* Note: Oracle has determined that CVE-2021-38205 is not applicable.

The kernel is not affected by CVE-2021-38205 since the code under
consideration is not compiled.


* CVE-2020-3702: Information disclosure in Atheros Wireless Card drivers.

A race condition flaw in layer 2 Wi-Fi encryption of Atheros Wireless
Card drivers could result in improper encryption. A specifically
handcrafted traffic could be created by a remote attacker and cause
information disclosure.

SUPPORT

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