This bug was fixed in the package xorg-server - 2:1.20.8-2ubuntu2.6

---------------
xorg-server (2:1.20.8-2ubuntu2.6) focal-security; urgency=medium

  * SECURITY UPDATE: out of bounds memory accesses on too short request
    - debian/patches/CVE-2020-14360.patch: check SetMap request length
      carefully in xkb/xkb.c.
    - CVE-2020-14360
  * SECURITY UPDATE: multiple heap overflows
    - debian/patches/CVE-2020-25712.patch: add bounds checks in xkb/xkb.c.
    - CVE-2020-25712

 -- Marc Deslauriers <marc.deslauri...@ubuntu.com>  Mon, 30 Nov 2020
12:56:33 -0500

** Changed in: xorg-server (Ubuntu Focal)
       Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-14360

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-25712

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https://bugs.launchpad.net/bugs/1897530

Title:
  [modeset][nvidia] X Server session crash with "No space left on
  device" and then "EnterVT failed for gpu screen 0"

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