The check_alu_op function in kernel/bpf/verifier.c in the Linux kernel through 4.4 allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact by leveraging incorrect sign extension.
4.4.0-1016.164.4.0-119.143~14.04.14.4.0-119.1434.4.0-1054.634.13.0-1005.74.4.0-9026.284.13.0-1006.94.13.0-32.35~16.04.14.4.0-1020.254.13.0-1015.16Exploitability
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