Use-after-free vulnerability in fs/crypto/ in the Linux kernel before 4.10.7 allows local users to cause a denial of service (NULL pointer dereference) or possibly gain privileges by revoking keyring keys being used for ext4, f2fs, or ubifs encryption, causing cryptographic transform objects to be freed prematurely.
https://github.com/torvalds/linux/commit/1b53cf9815bb4744958d41f3795d5d5a1d365e2d
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.10.7