CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)

CVE ID

CVE-2018-5390

DESCRIPTION

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.

CVSS3 Base Score    7.5
Public Date: 2018-08-06  
CWE: CWE-400

 

RESOLUTION

  Fixed with kernel-2.6.32-754.3.5.el6.x86_64.rpm in Unitrends security update (>=08/16/2018)

LINK TO ADVISORIES

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