The time subsystem in the Linux kernel through 4.9.9, when CONFIG_TIMER_STATS is enabled, allows local users to discover real PID values (as distinguished from PID values inside a PID namespace) by reading the /proc/timer_list file, related to the print_timer function in kernel/time/timer_list.c and the __timer_stats_timer_set_start_info function in kernel/time/timer.c.
4.13.0-16.196.11.0-8.85.3.0-18.195.3.0-24.265.4.0-9.123.11.0-12.193.12.0-1.33.12.0-2.53.12.0-2.73.12.0-3.83.12.0-3.93.12.0-4.103.12.0-4.123.12.0-5.133.12.0-7.15+170 more4.2.0-16.194.2.0-17.214.2.0-19.234.3.0-1.104.3.0-2.114.3.0-5.164.3.0-6.174.3.0-7.184.4.0-10.254.4.0-101.124+115 more4.4.0-208.2406.5.0-9.95.13.0-19.196.11.0-1004.45.3.0-1003.35.3.0-1008.95.3.0-1009.105.3.0-1010.115.4.0-1005.54.4.0-1002.24.4.0-1003.34.4.0-1005.54.4.0-1006.64.4.0-1009.94.4.0-1010.104.4.0-1011.114.4.0-1012.124.4.0-1014.144.4.0-1016.16+44 more4.4.0-1090.94Exploitability
AV:LAC:LPR:NUI:NScope
S:UImpact
C:LI:NA:NCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N