RHSA-2018:3459: Important: kernel security, bug fix, and enhancement update
The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391) kernel: out-of-bounds access in the showtimer function in kernel/time/posix-timers.c (CVE-2017-18344) 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.Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391.Bug Fix(es):These updated kernel packages include also numerous bug fixes. Space precludes documenting all of the bug fixes in this advisory. See the descriptions in the related Knowledge Article: https://access.redhat.com/articles/3674801
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Frequently Asked Questions
What is the severity of RHSA-2018:3459?
The vulnerability classified under RHSA-2018:3459 has been rated as important.
How do I fix RHSA-2018:3459?
To resolve the issue associated with RHSA-2018:3459, you need to update to kernel version 3.10.0-862.20.2.el7 or newer.
What does RHSA-2018:3459 address?
RHSA-2018:3459 addresses a flaw in the Linux kernel related to the handling of fragmented IPv4 and IPv6 packets.
Which systems are affected by RHSA-2018:3459?
RHSA-2018:3459 affects systems running specific versions of the Red Hat Enterprise Linux kernel.
Is a reboot required after applying the fix for RHSA-2018:3459?
Yes, a reboot is usually required after applying the security updates related to RHSA-2018:3459 to ensure the changes take effect.