The alarm_timer_nsleep function in kernel/time/alarmtimer.c in the Linux kernel through 4.17.3 has an integer overflow via a large relative timeout because ktime_add_safe is not used.
Exploitability
AV:LAC:LPR:LUI:NScope
S:UImpact
C:NI:NA:L3.3/CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L