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Red Hat Security Advisory 2019-1196-01

Red Hat Security Advisory 2019-1196-01
Posted May 15, 2019
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2019-1196-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include a CPU related vulnerability.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2019-11091
MD5 | ea6b30f876259d3118a38ac851328732

Red Hat Security Advisory 2019-1196-01

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Important: kernel security update
Advisory ID: RHSA-2019:1196-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:1196
Issue date: 2019-05-14
CVE Names: CVE-2018-12126 CVE-2018-12127 CVE-2018-12130
CVE-2019-11091
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.5
Advanced Update Support.

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 AUS (v. 6.5) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.5) - x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es):

* A flaw was found in the implementation of the "fill buffer", a mechanism
used by modern CPUs when a cache-miss is made on L1 CPU cache. If an
attacker can generate a load operation that would create a page fault, the
execution will continue speculatively with incorrect data from the fill
buffer while the data is fetched from higher level caches. This response
time can be measured to infer data in the fill buffer. (CVE-2018-12130)

* Modern Intel microprocessors implement hardware-level micro-optimizations
to improve the performance of writing data back to CPU caches. The write
operation is split into STA (STore Address) and STD (STore Data)
sub-operations. These sub-operations allow the processor to hand-off
address generation logic into these sub-operations for optimized writes.
Both of these sub-operations write to a shared distributed processor
structure called the 'processor store buffer'. As a result, an unprivileged
attacker could use this flaw to read private data resident within the CPU's
processor store buffer. (CVE-2018-12126)

* Microprocessors use a ‘load port’ subcomponent to perform load operations
from memory or IO. During a load operation, the load port receives data
from the memory or IO subsystem and then provides the data to the CPU
registers and operations in the CPU’s pipelines. Stale load operations
results are stored in the 'load port' table until overwritten by newer
operations. Certain load-port operations triggered by an attacker can be
used to reveal data about previous stale requests leaking data back to the
attacker via a timing side-channel. (CVE-2018-12127)

* Uncacheable memory on some microprocessors utilizing speculative
execution may allow an authenticated user to potentially enable information
disclosure via a side channel with local access. (CVE-2019-11091)

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:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

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

The system must be rebooted for this update to take effect.

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

1646781 - CVE-2018-12126 hardware: Microarchitectural Store Buffer Data Sampling (MSBDS)
1646784 - CVE-2018-12130 hardware: Microarchitectural Fill Buffer Data Sampling (MFBDS)
1667782 - CVE-2018-12127 hardware: Micro-architectural Load Port Data Sampling - Information Leak (MLPDS)
1705312 - CVE-2019-11091 hardware: Microarchitectural Data Sampling Uncacheable Memory (MDSUM)

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 6.5):

Source:
kernel-2.6.32-431.94.2.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-431.94.2.el6.noarch.rpm
kernel-doc-2.6.32-431.94.2.el6.noarch.rpm
kernel-firmware-2.6.32-431.94.2.el6.noarch.rpm

x86_64:
kernel-2.6.32-431.94.2.el6.x86_64.rpm
kernel-debug-2.6.32-431.94.2.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-431.94.2.el6.x86_64.rpm
kernel-debug-devel-2.6.32-431.94.2.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.94.2.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.94.2.el6.x86_64.rpm
kernel-devel-2.6.32-431.94.2.el6.x86_64.rpm
kernel-headers-2.6.32-431.94.2.el6.x86_64.rpm
perf-2.6.32-431.94.2.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.94.2.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.94.2.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.5):

Source:
kernel-2.6.32-431.94.2.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-431.94.2.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.94.2.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.94.2.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.94.2.el6.x86_64.rpm
python-perf-2.6.32-431.94.2.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.94.2.el6.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-2018-12126
https://access.redhat.com/security/cve/CVE-2018-12127
https://access.redhat.com/security/cve/CVE-2018-12130
https://access.redhat.com/security/cve/CVE-2019-11091
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/mds

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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