[Ksplice][Ubuntu-20.04-Updates] New Ksplice updates for Ubuntu 20.04 Focal (USN-4945-1)

[Oracle Ksplice]

Synopsis: USN-4945-1 can now be patched using Ksplice
CVEs: CVE-2020-25639 CVE-2021-28038 CVE-2021-28375 CVE-2021-28660 CVE-2021-29265 CVE-2021-29650 CVE-2021-30002

Systems running Ubuntu 20.04 Focal can now use Ksplice to patch
against the latest Ubuntu Security Notice, USN-4945-1.

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-2020-25639: Denial-of-service in ioctls of Nouveau graphics driver.

A bad error handling in ioctls of Nouveau graphics driver could result
in a system crash. A local, unprivileged user could use this flaw to
cause a denial-of-service.


* CVE-2021-29265: Denial-of-service in usbip driver due to race conditions.

Race conditions in the stub-up sequence of the usbip driver during
an update of the local and shared status could lead to a system crash.
A local attacker could use this flaw to cause a Denial-of-service.


* CVE-2021-30002: Denial-of-service in V4L2 driver due to memory leaks.

A flaw in the exit code sequence of V4L2 driver could lead to memory
leaks. A local user could use this flaw to cause a denial-of-service.


* CVE-2021-28660: Out-of-bounds writes in ioctls of Realtek RTL8188EU Wireless LAN NIC driver.

A missing error handling check in ioctl of Realtek RTL8188EU Wireless
LAN NIC driver could lead to out-of-bounds writes. A local user could
use this flaw for a denial-of-service or code execution.


* CVE-2021-28038, XSA-367: Mishandling of errors causes DoS of Xen backend.

Error conditions in the net Xen backend driver may incorrectly cause
kernel assertion failures. A malicious or buggy Xen frontend might
trigger these conditions, causing a denial-of-service in the host.


* CVE-2021-29650: Denial-of-service in Netfilter due to incorrect memory barrier.

Lack of a full memory barrier upon the assignment of a new table value
in the Netfilter subsystem could result in a system crash. A local user
could use this flaw to cause a denial-of-service.


* Note: Oracle has determined that CVE-2021-28375 is not applicable.

Oracle has determined that CVE-2021-28375 is not applicable to x86.
Applying the patch has no resulting changes in the generated object
files.


* Out-of-bounds writes in ioctls of Realtek RTL8192U Wireless LAN NIC driver.

A missing error handling check in ioctls of Realtek RTL8192U Wireless
LAN NIC driver could lead to out-of-bounds writes. A local user could
use this flaw for a denial-of-service or code execution.

SUPPORT

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