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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel tcp_splice_read() Infinite Loop Lets Remote Consume Excessive CPU Resources on the Target System
SecurityTracker Alert ID:  1037897
SecurityTracker URL:  http://securitytracker.com/id/1037897
CVE Reference:   CVE-2017-6214   (Links to External Site)
Date:  Feb 23 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel. A remote user can consume excessive CPU resources on the target system.

A remote user can send a specially crafted TCP packet with the URG flag to trigger a flaw in the tcp_splice_read() function in 'net/ipv4/tcp.c' and cause the target service to enter an infinite loop and consume excessive CPU resources on the target system.

Impact:   A remote user can consume excessive CPU resources on the target system.
Solution:   The vendor has issued a fix (4.9.11, 4.10-rc8).

The vendor advisory is available at:

https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.11

Vendor URL:  www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.11 (Links to External Site)
Cause:   State error

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 31 2017 (Red Hat Issues Fix) Linux Kernel tcp_splice_read() Infinite Loop Lets Remote Consume Excessive CPU Resources on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Sep 19 2017 (Ubuntu Issues Fix) Linux Kernel tcp_splice_read() Infinite Loop Lets Remote Consume Excessive CPU Resources on the Target System
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS.



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