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Red Hat Security Advisory 2019-2865-01

Red Hat Security Advisory 2019-2865-01
Posted Sep 23, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-2865-01 - This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow, kernel
systems | linux, redhat
advisories | CVE-2019-14835
SHA-256 | 1622d04a6345fd45798a8cfd130ab3b855a18bc7e0997986b33418f0cca88ec9

Red Hat Security Advisory 2019-2865-01

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====================================================================
Red Hat Security Advisory

Synopsis: Important: kpatch-patch security update
Advisory ID: RHSA-2019:2865-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2865
Issue date: 2019-09-23
CVE Names: CVE-2019-14835
====================================================================
1. Summary:

An update for kpatch-patch is now available for RHEL-7.6.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server EUS (v. 7.6) - ppc64le, x86_64

3. Description:

This is a kernel live patch module which can be loaded by the kpatch
command line utility to modify the code of a running kernel.

Security Fix(es):

* A buffer overflow flaw was found in the way Linux kernel's vhost
functionality that translates virtqueue buffers to IOVs, logged the buffer
descriptors during migration. A privileged guest user able to pass
descriptors with invalid length to the host when migration is underway,
could use this flaw to increase their privileges on the host.
(CVE-2019-14835)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1750727 - CVE-2019-14835 kernel: vhost-net: guest to host kernel escape during migration

6. Package List:

Red Hat Enterprise Linux Server EUS (v. 7.6):

Source:
kpatch-patch-3_10_0-957_35_1-1-1.el7.src.rpm

ppc64le:
kpatch-patch-3_10_0-957_35_1-1-1.el7.ppc64le.rpm
kpatch-patch-3_10_0-957_35_1-debuginfo-1-1.el7.ppc64le.rpm

x86_64:
kpatch-patch-3_10_0-957_35_1-1-1.el7.x86_64.rpm
kpatch-patch-3_10_0-957_35_1-debuginfo-1-1.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2019-14835
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/kernel-vhost

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2019 Red Hat, Inc.
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