smbd in Samba before 4.4.10 and 4.5.x before 4.5.6 has a denial of service vulnerability (fd_open_atomic infinite loop with high CPU usage and memory consumption) due to wrongly handling dangling symlinks.
https://lists.debian.org/debian-lts-announce/2019/04/msg00013.html
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=10c3e3923022485c720f322ca4f0aca5d7501310
https://access.redhat.com/errata/RHSA-2017:2778
https://access.redhat.com/errata/RHSA-2017:2338