[Ksplice][Virtuozzo 4.7 Updates] New Ksplice updates for Virtuozzo 4.7 or OpenVZ on RHEL 6 (2.6.32-042stab140.1)

[Oracle Ksplice]

Synopsis: 2.6.32-042stab140.1 can now be patched using Ksplice
CVEs: CVE-2017-17805 CVE-2018-17972 CVE-2019-1125 CVE-2019-11810 CVE-2019-5489

Systems running Virtuozzo 4.7 or the OpenVZ RHEL 6 kernel can now use
Ksplice to patch against the latest Parallels Virtuozzo Containers 4.7
kernel security update, 2.6.32-042stab140.1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running Virtuozzo 4.7
or OpenVZ on RHEL 6 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

* Memory leak when releasing a xenbus file.

A missing free of resources when releasing xenbus file could lead to a
memory leak. A local attacker could use this flaw to exhaust kernel
memory and cause a denial-of-service.


* CVE-2019-5489: Information leak in the mincore() syscall implementation.

Missing checks in the mincore() syscall could let a local attacker
observes page cache access patterns on other processes in the system and
lead to an information leak.


* CVE-2018-17972: Information leak in /proc kernel stack dumps.

A failure to restrict accessing /proc/self/task/*/stack to only
root could allow an unprivileged user to get information about the
stack and its contents for another process.


* CVE-2017-17805: Denial-of-service in SALSA20 block cipher.

Incorrect handling of zero length buffers could result in an invalid
pointer dereference and kernel crash.  A local, unprivileged user could
use this flaw to crash the system, or potentially, escalate privileges.


* CVE-2019-1125: Information leak in kernel entry code when swapping GS.

A local attacker could speculatively access percpu data using a user
defined GS and leak information about running kernel to facilitate an
attack.


* CVE-2019-11810: Denial-of-service in LSI Logic MegaRAID probing.

A logic error in the LSI Logic MegaRAID device probing could result in a
NULL pointer dereference and kernel crash under specific conditions.

SUPPORT

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