An issue was discovered in the Linux kernel through 4.18.8. The vmacache_flush_all function in mm/vmacache.c mishandles sequence number overflows. An attacker can trigger a use-after-free (and possibly gain privileges) via certain thread creation, map, unmap, invalidation, and dereference operations.
4.4.0-1031.344.15.0-1031.32~14.04.14.4.0-137.163~14.04.14.4.0-137.1634.4.0-1069.794.15.0-1025.26~16.04.14.15.0-1021.22~16.04.14.15.0-36.39~16.04.14.4.0-1035.414.4.0-1098.106Exploitability
AV:LAC:LPR:LUI:NScope
S:UImpact
C:HI:HA:HCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H