An issue was discovered in the Linux kernel before 4.18.6. An information leak in cdrom_ioctl_drive_status in drivers/cdrom/cdrom.c could be used by local attackers to read kernel memory because a cast from unsigned long to int interferes with bounds checking. This is similar to CVE-2018-10940.
https://www.debian.org/security/2018/dsa-4308
https://usn.ubuntu.com/3822-2/
https://usn.ubuntu.com/3822-1/
https://usn.ubuntu.com/3820-3/
https://usn.ubuntu.com/3820-2/
https://usn.ubuntu.com/3820-1/
https://usn.ubuntu.com/3797-2/
https://usn.ubuntu.com/3797-1/
https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
https://github.com/torvalds/linux/commit/8f3fafc9c2f0ece10832c25f7ffcb07c97a32ad4
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.6
https://access.redhat.com/errata/RHSA-2019:4154
https://access.redhat.com/errata/RHSA-2019:2043
https://access.redhat.com/errata/RHSA-2019:2029