crypto/mcryptd.c in the Linux kernel before 4.8.15 allows local users to cause a denial of service (NULL pointer dereference and system crash) by using an AF_ALG socket with an incompatible algorithm, as demonstrated by mcryptd(md5).
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd
marc.info/?l=linux-crypto-vger&m=148063683310477&w=2
www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.15
www.openwall.com/lists/oss-security/2017/01/17/13
www.securityfocus.com/bid/95677
access.redhat.com/errata/RHSA-2017:1842
access.redhat.com/errata/RHSA-2017:2077
bugzilla.redhat.com/show_bug.cgi?id=1404200
github.com/torvalds/linux/commit/48a992727d82cb7db076fa15d372178743b1f4cd