The ext4_fill_super function in fs/ext4/super.c in the Linux kernel through 4.15.15 does not always initialize the crc32c checksum driver, which allows attackers to cause a denial of service (ext4_xattr_inode_hash NULL pointer dereference and system crash) via a crafted ext4 image.
4.15.0-1014.14~16.04.14.15.0-1014.14~16.04.14.15.0-24.26~16.04.14.15.0-24.264.15.0-1011.114.15.0-1014.144.15.0-1010.104.15.0-1012.124.15.0-1009.124.15.0-1013.14Exploitability
AV:LAC:LPR:NUI:RScope
S:UImpact
C:NI:NA:HCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H