RHEL 6 : kernel (RHSA-2018:2645)
High Nessus Plugin ID 112284
SynopsisThe remote Red Hat host is missing one or more security updates.
DescriptionAn update for kernel is now available for Red Hat Enterprise Linux 6.7 Extended Update Support.
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.
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es) :
* 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.
Red Hat would like to thank Juha-Matti Tilli (Aalto University, Department of Communications and Networking and Nokia Bell Labs) for reporting this issue.
SolutionUpdate the affected packages.