It should be caused by a stable kernel backport:
Author: Ping Cheng <pingli...@gmail.com>
Date: Wed Dec 9 20:52:30 2020 -0800
HID: wacom: Fix memory leakage caused by kfifo_alloc
BugLink: https://bugs.launchpad.net/bugs/1915473
commit 37309f47e2f5674f3e86cb765312ace42cfcedf5 upstream.
It should be fixed by:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=179e8e47c02a1950f1c556f2b854bdb2259078fb
groovy Ubuntu-5.8.0-46.52 already got this fix, could you try it?
I am not sure when will it be landed in focal/hwe-5.8 kernel.
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https://bugs.launchpad.net/bugs/1920772
Title:
Kernel NULL pointer dereference when using Wacom pen
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