arch/s390/kernel/ptrace.c in the Linux kernel before 3.15.8 on the s390 platform does not properly restrict address-space control operations in PTRACE_POKEUSR_AREA requests, which allows local users to obtain read and write access to kernel memory locations, and consequently gain privileges, via a crafted application that makes a ptrace system call.
https://github.com/torvalds/linux/commit/dab6cf55f81a6e16b8147aed9a843e1691dcd318
https://exchange.xforce.ibmcloud.com/vulnerabilities/95069
https://bugzilla.redhat.com/show_bug.cgi?id=1114089
http://www.securitytracker.com/id/1030683
http://www.securityfocus.com/bid/68940
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.15.8
http://www.debian.org/security/2014/dsa-2992