The mpi_powm function in lib/mpi/mpi-pow.c in the Linux kernel through 4.8.11 does not ensure that memory is allocated for limb data, which allows local users to cause a denial of service (stack memory corruption and panic) via an add_key system call for an RSA key with a zero exponent.
- http://seclists.org/fulldisclosure/2016/Nov/76
- https://github.com/RUB-SysSec/kAFL