The Linux kernel before 5.4.2 mishandles ext4_expand_extra_isize, as demonstrated by use-after-free errors in __ext4_expand_extra_isize and ext4_xattr_set_entry, related to fs/ext4/inode.c and fs/ext4/super.c, aka CID-4ea99936a163.
4.15.0-1060.62~16.04.14.15.0-1071.764.15.0-1055.594.15.0-88.88~16.04.14.10.0-14.16~16.04.14.10.0-19.21~16.04.14.10.0-20.22~16.04.14.10.0-21.23~16.04.14.10.0-22.24~16.04.14.10.0-24.28~16.04.14.10.0-26.30~16.04.14.11.0-13.19~16.04.14.11.0-14.20~16.04.14.13.0-16.19~16.04.3+13 more4.15.0-1033.36~16.04.14.15.0-88.884.15.0-1060.625.0.0-1024.27~18.04.15.0.0-1029.31~18.04.1Exploitability
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