In the Linux kernel through 5.4.6, there is a NULL pointer dereference in drivers/scsi/libsas/sas_discover.c because of mishandling of port disconnection during discovery, related to a PHY down race condition, aka CID-f70267f379b5.
lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f70267f379b5e5e11bdc5d72a56bf17e5feed01f
lists.debian.org/debian-lts-announce/2020/01/msg00013.html
lists.debian.org/debian-lts-announce/2020/03/msg00001.html
security.netapp.com/advisory/ntap-20200204-0002/
usn.ubuntu.com/4284-1/
usn.ubuntu.com/4285-1/
usn.ubuntu.com/4286-1/
usn.ubuntu.com/4286-2/
usn.ubuntu.com/4287-1/
usn.ubuntu.com/4287-2/