sound/core/timer.c in the Linux kernel before 4.4.1 uses an incorrect type of mutex, which allows local users to cause a denial of service (race condition, use-after-free, and system crash) via a crafted ioctl call.
Exploitability
AV:LAC:HPR:NUI:NScope
S:UImpact
C:NI:NA:H5.1/CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H