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Category:   Device (Router/Bridge/Hub)  >   Cisco NX-OS Vendors:   Cisco
(Cisco Issues Fix for Cisco NX-OS) Linux Kernel IP Fragment Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
SecurityTracker Alert ID:  1041967
SecurityTracker URL:  http://securitytracker.com/id/1041967
CVE Reference:   CVE-2018-5391   (Links to External Site)
Date:  Oct 26 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. Cisco NX-OS is affected.

The system uses an inefficient IP fragment reassembly algorithm. A remote user can send specially crafted fragmented data 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 fix.

Cisco Nexus 3000 Series Switches: CSCvm09117

Cisco Nexus 7000 Series Switches: CSCvm15461

Cisco Nexus 9000 Series Fabric Switches - ACI mode: CSCvm15457

Cisco Nexus 9000 Series Switches - Standalone, NX-OS mode: CSCvm09117

The Cisco advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-ip-fragment

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-ip-fragment (Links to External Site)
Cause:   Resource error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 15 2018 Linux Kernel IP Fragment Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System



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