fs/ext4/extents.c in the Linux kernel through 5.1.2 does not zero out the unused memory region in the extent tree block, which might allow local users to obtain sensitive information by reading uninitialized data in the filesystem.
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00071.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00048.html
http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html
https://access.redhat.com/errata/RHSA-2019:2029
https://access.redhat.com/errata/RHSA-2019:2043
https://access.redhat.com/errata/RHSA-2019:3309
https://access.redhat.com/errata/RHSA-2019:3517
https://github.com/torvalds/linux/commit/592acbf16821288ecdc4192c47e3774a4c48bb64
https://lists.debian.org/debian-lts-announce/2019/06/msg00010.html
https://lists.debian.org/debian-lts-announce/2019/06/msg00011.html
https://seclists.org/bugtraq/2019/Jun/26
https://usn.ubuntu.com/4068-1/
https://usn.ubuntu.com/4068-2/
https://usn.ubuntu.com/4069-1/
https://usn.ubuntu.com/4069-2/
https://usn.ubuntu.com/4076-1/
https://usn.ubuntu.com/4095-2/