The first one is caused by nvidia driver.
The version isn't up-to-date:
[ 6.157480] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 435.21 Sun Aug
25 08:17:57 CDT 2019
Can you please try newer version like 440 or 450?
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1888068
Title:
kernel tried to execute NX-protected page - exploit attempt
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