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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
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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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