I can confirm that this bug is fixed in bionic:
# echo "x" > /proc/sysrq-trigger Nov 14 20:38:58 panzersperre kernel: sysrq: SysRq : Nov 14 20:38:58 panzersperre kernel: This sysrq operation is disabled from userspace.
I don't have a disco or eoan to test.
I can confirm that this bug is fixed in bionic:
# echo "x" > /proc/sysrq-trigger
Nov 14 20:38:58 panzersperre kernel: sysrq: SysRq :
Nov 14 20:38:58 panzersperre kernel: This sysrq operation is disabled from userspace.
I don't have a disco or eoan to test.