[El-errata] New Ksplice updates for UEKR4 4.1.12 on OL6 and OL7 (ELSA-2019-4808)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2019-4808 can now be patched using Ksplice
CVEs: CVE-2019-14283 CVE-2019-15239 CVE-2019-15666

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2019-4808.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2019-4808.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running UEKR4 4.1.12 on
OL6 and OL7 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-2019-15239: Denial-of-service when establishing TCP connection.

A bug when retransmitting unacknowledged TCP packet in the TCP Fast Open
path triggers a kernel crash. A malicious local user can exploit this to
cause a denial-of-service.

Orabug: 30240133


* CVE-2019-14283: Denial-of-service in floppy disk geometry setting 
during insertion.

Missing input validation in the floppy disk geometry setting calls could
allow a malicious local user with access to the floppy device to cause
an out-of-bounds access either crashing the system or leaking the
contents of kernel memory.

Orabug: 30318219


* Denial-of-service when receiving segments over TCP.

A logic error when receiving segments over TCP could lead to a general
protection fault. A local attacker could use this flaw to cause a
denial-of-service.

Orabug: 29997352


* CVE-2019-15666: Denial-of-service when setting network xfrm policy.

A missing check on user input when setting network xfrm policy from
userspace could lead to an out-of-bounds access. A local attacker could
use this flaw to cause a denial-of-service.

Orabug: 30322230


* Memory corruption during Xen Software I/O TLB unregistration.

A logic error when unregistering Xen Software I/O TLB memory could cause
memory to be unmapped incorrectly. An attacker might be able to use this
to cause crashes or memory corruption.

Orabug: 30141778


* Performance regression during microcode loading.

The microcode update mechanism was changed in such a way that each CPU
would apply the update while the other cores were idle. On systems with
many CPUs, this will cause a prolonged delay when microcode is updated.

Orabug: 30302412


* NFSv4 state list corruption causes denial-of-service.

A race condition when freeing NFSv4 state objects could result in
objects being added present in the global list multiple times, resulting
in memory corruption and a denial-of-service.

Orabug: 30124013


SUPPORT

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