Operating System:

[RedHat]

Published:

16 January 2020

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0148
                   kernel-rt security and bug fix update
                              16 January 2020

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel-rt
Publisher:         Red Hat
Operating System:  Red Hat Enterprise MRG for RHEL-6
                   Red Hat Enterprise Linux Server 6
Impact/Access:     Increased Privileges     -- Existing Account
                   Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-11599 CVE-2018-20856 CVE-2018-18281

Reference:         ESB-2020.0068
                   ESB-2019.4121
                   ESB-2019.4110
                   ESB-2019.3997
                   ESB-2019.1909

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2020:0100

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                   Red Hat Security Advisory

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2020:0100-01
Product:           Red Hat Enterprise MRG for RHEL-6
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:0100
Issue date:        2020-01-14
CVE Names:         CVE-2018-18281 CVE-2018-20856 CVE-2019-11599 
=====================================================================

1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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 MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* kernel: Use-after-free in __blk_drain_queue() function in
block/blk-core.c (CVE-2018-20856)

* kernel: TLB flush happens too late on mremap (CVE-2018-18281)

* kernel: fix race condition between mmget_not_zero()/get_task_mm() and
core dumping (CVE-2019-11599)

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.

Bug Fix(es):

* update the MRG 2.5.z 3.10 realtime-kernel sources (BZ#1779367)

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/):

1645121 - CVE-2018-18281 kernel: TLB flush happens too late on mremap
1705937 - CVE-2019-11599 kernel: fix race condition between mmget_not_zero()/get_task_mm() and core dumping
1738705 - CVE-2018-20856 kernel: Use-after-free in __blk_drain_queue() function in block/blk-core.c
1779367 - update the MRG 2.5.z 3.10 realtime-kernel sources

6. Package List:

Red Hat MRG Realtime for RHEL 6 Server v.2:

Source:
kernel-rt-3.10.0-693.62.1.rt56.659.el6rt.src.rpm

noarch:
kernel-rt-doc-3.10.0-693.62.1.rt56.659.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-693.62.1.rt56.659.el6rt.noarch.rpm

x86_64:
kernel-rt-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-693.62.1.rt56.659.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-693.62.1.rt56.659.el6rt.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-2018-18281
https://access.redhat.com/security/cve/CVE-2018-20856
https://access.redhat.com/security/cve/CVE-2019-11599
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/

Copyright 2020 Red Hat, Inc.
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