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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Ubuntu Issues Fix) Linux Kernel Copy-on-Write Memory Management Race Condition May Let Local Users Obtain Elevated Privileges
SecurityTracker Alert ID:  1040021
SecurityTracker URL:  http://securitytracker.com/id/1040021
CVE Reference:   CVE-2017-1000405   (Links to External Site)
Date:  Dec 18 2017
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Ubuntu 14.04 LTS
Description:   A vulnerability was reported in the Linux kernel. A local user can obtain elevated privileges on the target system.

A local user can run a specially crafted application to trigger a race condition in copy-on-write of transparent huge pages and overwrite read-only huge pages to cause the target application to crash or to potentially gain elevated privileges on the target system.

[Editor's note: The vulnerability is due to an incomplete fix for CVE-2016-5195 (Alert ID 1037078).]

The original advisory is available at:

https://medium.com/bindecy/huge-dirty-cow-cve-2017-1000405-110eca132de0

Eylon Ben Yaakov and Daniel Shapiro from Bindecy reported this vulnerability.

Impact:   A local user can cause denial of service conditions on the target system.

A local user may be able to obtain elevated privileges on the target system.

Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

https://www.ubuntu.com/usn/usn-3510-1

Vendor URL:  www.ubuntu.com/usn/usn-3510-1 (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Dec 18 2017 Linux Kernel Copy-on-Write Memory Management Race Condition May Let Local Users Obtain Elevated Privileges



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