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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel key_gc_unused_keys() Garbage Collection Bug Lets Local Users Cause Denial of Service Conditions on the Target System
SecurityTracker Alert ID:  1034472
SecurityTracker URL:  http://securitytracker.com/id/1034472
CVE Reference:   CVE-2015-7872   (Links to External Site)
Date:  Dec 17 2015
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel. A local user can cause denial of service conditions on the target system.

A local user can supply a specially crafted keyctl command to trigger a garbage collection error in the keyring handler and cause the target system to crash.

The vulnerability resides in the key_gc_unused_keys() function in 'security/keys/gc.c'.

Dmitry Vyukov reported this vulnerability.

Impact:   A local user can cause the target system to crash.
Solution:   The vendor has issued a source code fix, available at:

https://github.com/torvalds/linux/commit/ce1fad2740c648a4340f6f6c391a8a83769d2e8c
https://github.com/torvalds/linux/commit/f05819df10d7b09f6d1eb6f8534a8f68e5a4fe61

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

Message History:   This archive entry has one or more follow-up message(s) listed below.
Dec 17 2015 (Ubuntu Issues Fix) Linux Kernel key_gc_unused_keys() Garbage Collection Bug Lets Local Users Cause Denial of Service Conditions on the Target System
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS.
Feb 16 2016 (Red Hat Issues Fix) Linux Kernel key_gc_unused_keys() Garbage Collection Bug Lets Local Users Cause Denial of Service Conditions on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Feb 17 2016 (Red Hat Issues Fix) Linux Kernel key_gc_unused_keys() Garbage Collection Bug Lets Local Users Cause Denial of Service Conditions on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 6 and 7.
Feb 17 2016 (CentOS Issues Fix) Linux Kernel key_gc_unused_keys() Garbage Collection Bug Lets Local Users Cause Denial of Service Conditions on the Target System
CentOS has issued a fix for CentOS 7.
Feb 18 2016 (Red Hat Issues Fix) Linux Kernel key_gc_unused_keys() Garbage Collection Bug Lets Local Users Cause Denial of Service Conditions on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Feb 18 2016 (Oracle Issues Fix for Oracle Linux) Linux Kernel key_gc_unused_keys() Garbage Collection Bug Lets Local Users Cause Denial of Service Conditions on the Target System
Oracle has issued a fix for Oracle Linux 7.



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