Advisory Published

RHSA-2018:2789: Important: kernel-rt security and bug fix update

First published: Tue Sep 25 2018(Updated: )

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.<br>Security Fix(es):<br><li> A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390)</li> Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting this issue.<br>Bug Fix(es):<br><li> The kernel-rt packages have been upgraded to the 3.10.0-693.39.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1616431)</li> <li> Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. This update disables preemption in the schedule_tail() function. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. The operating system no longer hangs due to this bug. (BZ#1618466)</li>

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-debug<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-debug-debuginfo<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-debug-devel<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-debuginfo<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-devel<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-doc<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-firmware<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-trace<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-trace-debuginfo<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-trace-devel<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-vanilla<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-vanilla-debuginfo<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6
redhat/kernel-rt-vanilla-devel<3.10.0-693.39.1.rt56.629.el6
3.10.0-693.39.1.rt56.629.el6

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203