The assoc_array_gc function in the associative-array implementation in lib/assoc_array.c in the Linux kernel before 3.16.3 does not properly implement garbage collection, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via multiple "keyctl newring" operations followed by a "keyctl timeout" operation.

References

• https://nvd.nist.gov/vuln/detail/CVE-2014-3631
• torvalds/linux@95389b0
• https://bugzilla.redhat.com/show_bug.cgi?id=1140325
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=95389b08d93d5c06ec63ab49bd732b0069b7c35e
• http://osvdb.org/show/osvdb/111298
• http://www.exploit-db.com/exploits/36268
• http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.16.3
• http://www.securityfocus.com/bid/70095
• http://www.ubuntu.com/usn/USN-2378-1
• http://www.ubuntu.com/usn/USN-2379-1
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=95389b08d93d5c06ec63ab49bd732b0069b7c35e