Ah ok,
looks like that's for Security fixes (CVEs):

linux (5.8.0-48.54) groovy; urgency=medium

  * CVE-2020-27170
    - bpf: Fix off-by-one for area size in creating mask to left

  * CVE-2020-27171
    - bpf: Prohibit alu ops for pointer types not defining ptr_limit

https://launchpad.net/ubuntu/+source/linux/5.8.0-48.54

Please wait for the kernel of the upcoming SRU cycle, which should be
available soon.

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-27170

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-27171

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https://bugs.launchpad.net/bugs/1920632

Title:
  use of Wacom stylus causes immediate system hang with kernel 5.8.0-45,
  but 5.8.0-44 works

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