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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
SecurityTracker Alert ID:  1041424
SecurityTracker URL:  http://securitytracker.com/id/1041424
CVE Reference:   CVE-2018-5390   (Links to External Site)
Updated:  Aug 8 2018
Original Entry Date:  Aug 7 2018
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.

The system uses an inefficient TCP reassembly algorithm. A remote user can send specially crafted data via an established TCP connection to consume excessive CPU resources on the target system.

Juha-Matti Tilli (Aalto University, Department of Communications and Networking / Nokia Bell Labs) reported this vulnerability.

Impact:   A remote user can consume excessive CPU resources on the target system.
Solution:   The vendor has issued a source code fix, available at:

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit /?id=1a4f14bab1868b443f0dd3c55b689a478f82e72e

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Resource error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 7 2018 (Ubuntu Issues Fix) Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
Ubuntu has issued a fix for Ubuntu Linux 18.04 LTS.
Aug 7 2018 (Oracle Issues Fix for Oracle Linux) Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
Oracle has issued a fix for Oracle Linux 7.
Aug 9 2018 (Oracle Issues Fix for Oracle Linux) Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
Oracle has issued a fix for Oracle Linux 7.
Aug 15 2018 (Red Hat Issues Fix) Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Aug 16 2018 (Ubuntu Issues Fix) Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS.
Aug 16 2018 (Ubuntu Issues Fix) Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
Ubuntu has issued a fix for Ubuntu Linux 16.04 LTS.



 Source Message Contents



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