The add_free_nid function in fs/f2fs/node.c in the Linux kernel before 4.12 does not properly track an allocated nid, which allows local users to cause a denial of service (race condition) or possibly have unspecified other impact via concurrent threads.
4.4.0-1040.434.4.0-144.170~14.04.14.4.0-145.1714.4.0-1079.894.13.0-1005.74.13.0-1002.54.13.0-32.35~16.04.14.4.0-1043.494.4.0-1106.1144.4.0-1110.115Exploitability
AV:LAC:HPR:LUI:NScope
S:UImpact
C:HI:HA:HCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H