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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Oracle Issues Fix for Oracle Linux) Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
SecurityTracker Alert ID:  1041429
SecurityTracker URL:  http://securitytracker.com/id/1041429
CVE Reference:   CVE-2018-5390   (Links to External Site)
Date:  Aug 7 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Oracle Linux 7
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:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2018-4189.html

Vendor URL:  linux.oracle.com/errata/ELSA-2018-4189.html (Links to External Site)
Cause:   Resource error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 7 2018 Linux Kernel TCP Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System



 Source Message Contents

Subject:  [El-errata] ELSA-2018-4189 Important: Oracle Linux 7 Unbreakable Enterprise kernel security update

Oracle Linux Security Advisory ELSA-2018-4189

http://linux.oracle.com/errata/ELSA-2018-4189.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
kernel-uek-4.14.35-1818.0.14.el7uek.x86_64.rpm
kernel-uek-debug-4.14.35-1818.0.14.el7uek.x86_64.rpm
kernel-uek-debug-devel-4.14.35-1818.0.14.el7uek.x86_64.rpm
kernel-uek-devel-4.14.35-1818.0.14.el7uek.x86_64.rpm
kernel-uek-tools-4.14.35-1818.0.14.el7uek.x86_64.rpm
kernel-uek-doc-4.14.35-1818.0.14.el7uek.noarch.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/kernel-uek-4.14.35-1818.0.14.el7uek.src.rpm



Description of changes:

[4.14.35-1818.0.14.el7uek]
- tcp: add tcp_ooo_try_coalesce() helper (Eric Dumazet)  [Orabug: 
28453849]  {CVE-2018-5390}
- tcp: call tcp_drop() from tcp_data_queue_ofo() (Eric Dumazet) 
[Orabug: 28453849]  {CVE-2018-5390}
- tcp: detect malicious patterns in tcp_collapse_ofo_queue() (Eric 
Dumazet)  [Orabug: 28453849]  {CVE-2018-5390}
- tcp: avoid collapses in tcp_prune_queue() if possible (Eric Dumazet) 
[Orabug: 28453849]  {CVE-2018-5390}
- tcp: free batches of packets in tcp_prune_ofo_queue() (Eric Dumazet) 
[Orabug: 28453849]  {CVE-2018-5390}


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