[Ksplice][Ubuntu-20.04-Updates] New Ksplice updates for Ubuntu 20.04 Focal (5.4.0-60.67)

[Roman Geller]

Synopsis: 5.4.0-60.67 can now be patched using Ksplice
CVEs: CVE-2020-25656 CVE-2020-25668 CVE-2020-25704 CVE-2020-27675 CVE-2020-28974

Systems running Ubuntu 20.04 Focal can now use Ksplice to patch
against the latest Ubuntu kernel update, 5.4.0-60.67.

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-2020-28974: Invalid memory access when manipulating framebuffer fonts.

A logic error when manipulating framebuffer console fonts may cause an
out-of-bounds memory read. A local attacker could use this flaw to read
privileged information or potentially cause a denial-of-service.


* CVE-2020-25704: Denial-of-service in the performance monitoring subsystem.

A possible memory leak when setting performance monitoring filter could lead to
kernel memory exhaustion. A local attacker could use this flaw to cause a
denial-of-service.


* CVE-2020-25668: Race condition when sending ioctls to a virtual terminal.

A race condition can possibly occur when sending ioctls to a tty device may
cause a use-after-free. A local attacker may use this to cause memory
corruption or a denial-of-service.


* CVE-2020-27675: Race condition when reconfiguring para-virtualized Xen devices.

An event-channel removal when reconfiguring paravirtualized devices may cause a
race condition leading to a null pointer dereference. A local attacker could use
this flaw to cause a denial-of-service on a dom0.


* CVE-2020-25656: Use-after-free in console subsystem.

Specific ioctls sent to the console subsystem could lead to a use-after-free.
A local attacker could use this flaw to read confidential data.

SUPPORT

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