Sigurnosni nedostatak jezgre operacijskog sustava

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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2018:1216-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1216
Issue date: 2018-04-24
CVE Names: CVE-2017-8824
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.2
Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update
Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP
Solutions.

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. 7.2) – noarch, x86_64
Red Hat Enterprise Linux Server E4S (v. 7.2) – noarch, ppc64le, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.2) – x86_64
Red Hat Enterprise Linux Server Optional E4S (v. 7.2) – ppc64le, x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 7.2) – x86_64
Red Hat Enterprise Linux Server TUS (v. 7.2) – noarch, x86_64

3. Description:

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

Security Fix(es):

* kernel: Use-after-free vulnerability in DCCP socket (CVE-2017-8824,
Important)

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

Red Hat would like to thank Mohamed Ghannam for reporting this issue.

Bug Fix(es):

* Previously, the XFS code included a circular dependency between the
xfs-log and the xfs-cil workqueues. Consequently, an XFS deadlock occurred
in some cases. This update adds a new workqueue dedicated to the log
covering background task to avoid the deadlock. (BZ#1543303)

* The kernel build requirements have been updated to the GNU Compiler
Collection (GCC) compiler version that has the support for Retpolines. The
Retpolines mechanism is a software construct that leverages specific
knowledge of the underlying hardware to mitigate the branch target
injection, also known as Spectre variant 2 vulnerability described in
CVE-2017-5715. (BZ#1553181)

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/):

1519591 – CVE-2017-8824 kernel: Use-after-free vulnerability in DCCP socket

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 7.2):

Source:
kernel-3.10.0-327.66.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.66.1.el7.noarch.rpm
kernel-doc-3.10.0-327.66.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-327.66.1.el7.x86_64.rpm
kernel-debug-3.10.0-327.66.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.66.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.66.1.el7.x86_64.rpm
kernel-devel-3.10.0-327.66.1.el7.x86_64.rpm
kernel-headers-3.10.0-327.66.1.el7.x86_64.rpm
kernel-tools-3.10.0-327.66.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.66.1.el7.x86_64.rpm
perf-3.10.0-327.66.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm
python-perf-3.10.0-327.66.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server E4S (v. 7.2):

Source:
kernel-3.10.0-327.66.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.66.1.el7.noarch.rpm
kernel-doc-3.10.0-327.66.1.el7.noarch.rpm

ppc64le:
kernel-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-debug-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-devel-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-headers-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-tools-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-327.66.1.el7.ppc64le.rpm
perf-3.10.0-327.66.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm
python-perf-3.10.0-327.66.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm

Red Hat Enterprise Linux Server TUS (v. 7.2):

Source:
kernel-3.10.0-327.66.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.66.1.el7.noarch.rpm
kernel-doc-3.10.0-327.66.1.el7.noarch.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.2):

x86_64:
kernel-debug-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.66.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.66.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.66.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional E4S (v. 7.2):

ppc64le:
kernel-debug-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-327.66.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.66.1.el7.ppc64le.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 7.2):

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-2017-8824
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

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