RedHat: RHSA-2019-0188:01 Important: kernel-rt security and bug fix update
Summary
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)
Summary
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.
References
https://access.redhat.com/security/cve/CVE-2018-18559 https://access.redhat.com/security/updates/classification/#important
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/
Topic
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 impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.
Topic
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
Bugs Fixed
1641878 - CVE-2018-18559 kernel: Use-after-free due to race condition in AF_PACKET implementation