** DISPUTED ** kernel/ptrace.c in the Linux kernel through 4.4.1
mishandles uid and gid mappings, which allows local users to gain
privileges by establishing a user namespace, waiting for a root
process to enter that namespace with an unsafe uid or gid, and then
using the ptrace system call. NOTE: the vendor states "there is no
kernel bug here."
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[linux-kernel] 20151226 [PATCH] ptrace: being capable wrt a process requires mapped uids/gids
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