[Ksplice][EL8-Updates] New Ksplice updates for OL 8 and RHEL 8 (ELSA-2021-3057)

[Oracle Ksplice]

Synopsis: ELSA-2021-3057 can now be patched using Ksplice
CVEs: CVE-2021-22543 CVE-2021-22555 CVE-2021-3609

Systems running RHCK on Oracle Linux 8 and Red Hat Enterprise Linux 8
can now use Ksplice to patch against the latest Red Hat kernel update,
ELSA-2021-3057.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2021-3057.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running OL 8 and RHEL 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-2021-22543: Privilege escalation in KVM due to RO page check bypass.

The reference counts of VM_IO|VM_PFNMAP pages can be manipulated to
cause a deliberate use-after-free. This can be manipulated to cause
writes to arbitrary memory pages, allowing a malicious user with the
ability to create virtual machines to escalate their privileges.


* CVE-2021-22555: Privilege escalation in Netfilter due to out-of-bounds memory write.

A heap out-of-bounds write in netfilter could allow an attacker to gain
privileges or cause a denial-of-service.


* CVE-2021-3609: Privilege escalation in CAN BCM due to use-after-free.

A race condition in the CAN BCM implementation could lead to use-after-free
vulnerability. A local attacker could potentially use this to execute
arbitrary code.

SUPPORT

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