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AUSCERT External Security Bulletin Redistribution
ESB-2019.0247
Important: kernel-rt security and bug fix update
30 January 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-18559
Reference: ESB-2019.0245
Original Bulletin:
https://access.redhat.com/errata/RHSA-2019:0188
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Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2019:0188-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:0188
Issue date: 2019-01-29
CVE Names: CVE-2018-18559
=====================================================================
1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
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 Realtime (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - 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 due to race condition in AF_PACKET implementation
(CVE-2018-18559)
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.
Bug Fix(es):
* The kernel-rt packages have been upgraded to the 3.10.0-957.5.1 source
tree, which provides a number of bug fixes over the previous version.
(BZ#1653822)
* Under certain circumstances, the following warning message, which
indicated a SCHED_DEADLINE bandwidth tracking mechanism error, occurred:
WARNING: CPU: 8 PID: 19536 at kernel/sched/deadline.c:64
dequeue_task_dl+0x121/0x140
This update fixes the sched_setscheduler() core kernel function, and
backports multiple upstream patches to the SCHED_DEADLINE scheduler. As a
result, the SCHED_DEADLINE bandwidth tracking mechanism is prevented from
error conditions, and the warning message no longer occurs. (BZ#1655439)
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/):
1641878 - CVE-2018-18559 kernel: Use-after-free due to race condition in AF_PACKET implementation
6. Package List:
Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source:
kernel-rt-3.10.0-957.5.1.rt56.916.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-957.5.1.rt56.916.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
Red Hat Enterprise Linux Realtime (v. 7):
Source:
kernel-rt-3.10.0-957.5.1.rt56.916.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-957.5.1.rt56.916.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-957.5.1.rt56.916.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-2018-18559
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 2019 Red Hat, Inc.
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