[Ksplice][Ubuntu-18.10-Updates] New Ksplice updates for Ubuntu 18.10 Cosmic (USN-3903-1)

[Allan Xavier]

Synopsis: USN-3903-1 can now be patched using Ksplice
CVEs: CVE-2018-16880 CVE-2019-6133 CVE-2018-18397

Systems running Ubuntu 18.10 Cosmic can now use Ksplice to patch
against the latest Ubuntu Security Notice, USN-3903-1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Ubuntu 18.10
Cosmic 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

* NULL pointer dereference when running fstrim on Bcache driver.

A missing check when running fstrim on Bcache driver could lead to a
NULL pointer dereference. A local attacker could use this flaw to cause
a denial-of-service.


* CVE-2018-16880: Denial-of-service in virtual networking subsystem.

A malicious virtual guest under specific conditions can trigger an
out-of-bounds write on a virtual host which may lead to kernel memory
corruption and system panic. An attacker could exploit this flaw to
cause a denial-of-service.


* Denial-of-service in ipip tunnel netlink interface.

A missing check in the ipip driver netlink interface can result in a NULL
pointer dereference, leading to a kernel crash. A local user with the ability
to create network interfaces could use this flaw to cause a denial-of-service.


* CVE-2019-6133: Privilege escalation via forked process impersonation.

A race condition between recording process start time and assigning a pid can
allow an attacker to impersonate a privileged process. A local user could use
this flaw to escalate privileges.


* Kernel panic in IPv6 GRE tunneling driver.

The ip6_gre driver can incorrectly handle network namespaces in the
ip6gre_changelink function, resulting in list corruption, and a
potential future kernel panic.


* CVE-2018-18397: Permission bypass when using userfaultd to write temp or
hugetlb filesystem files.

Missing checks in userfaultd could let a local attacker write into
read-only files residing in a hugetlb or a temp filesystem.

SUPPORT

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