system
Describe <CVE-2011-4110>.
user
What is <CVE-2011-4110>?
assistant
The user_update function in security/keys/user_defined.c in the Linux kernel 2.6 allows local users to cause a denial of service (NULL pointer dereference and kernel oops) via vectors related to a user-defined key and "updating a negative key into a fully instantiated key.".