An issue was discovered in the Linux kernel through 4.17.10. There is a buffer overflow in truncate_inline_inode() in fs/f2fs/inline.c when umounting an f2fs image, because a length value may be negative.
4.15.0-1047.49~16.04.14.15.0-1055.604.15.0-1040.42~16.04.14.15.0-58.64~16.04.14.15.0-1021.23~16.04.14.15.0-58.644.15.0-1047.495.0.0-1014.14~18.04.14.15.0-1040.424.15.0-1040.42Exploitability
AV:LAC:LPR:NUI:RScope
S:UImpact
C:NI:NA:HCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H