RHSA-2018:2645: Important: kernel security update
The kernel packages contain the Linux kernel, the core of any Linux operating system.<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 tcpcollapseofoqueue() and tcppruneofoqueue() 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.
Affected Software
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Frequently Asked Questions
What is the severity of RHSA-2018:2645?
RHSA-2018:2645 is classified as a moderate severity vulnerability.
How do I fix RHSA-2018:2645?
To fix RHSA-2018:2645, update your kernel packages to version 2.6.32-573.62.1.el6 or higher.
What is the nature of the vulnerability detailed in RHSA-2018:2645?
RHSA-2018:2645 involves a flaw named SegmentSmack, which affects how the Linux kernel handles specially crafted TCP packets.
What systems are affected by RHSA-2018:2645?
RHSA-2018:2645 affects systems running the specified versions of the Red Hat kernel packages.
Is there a workaround for RHSA-2018:2645?
There is no specific workaround for RHSA-2018:2645; the recommended action is to apply the available update.