The rbd block device driver in drivers/block/rbd.c in the Linux kernel through 5.8.9 used incomplete permission checking for access to rbd devices, which could be leveraged by local attackers to map or unmap rbd block devices, aka CID-f44d04e696fe.
Exploitability
AV:LAC:HPR:HUI:NScope
S:UImpact
C:NI:HA:N4.1/CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N