Lilith of Cisco Talos reports:
A code execution vulnerability exists in the directory rehashing
functionality of E2fsprogs e2fsck 1.45.4. A specially crafted ext4
directory can cause an out-of-bounds write on the stack, resulting
in code execution. An attacker can corrupt a partition to trigger
this vulnerability.
Theodore Y. Ts'o reports:
E2fsprogs 1.45.5 [...:] Fix a potential out of bounds write when
checking a maliciously corrupted file system. This is probably not
exploitable on 64-bit platforms, but may be exploitable on 32-bit
binaries depending on how the compiler lays out the stack variables.
(Addresses CVE-2019-5188)