Ubuntu has issued an advisory for this on December 1:
https://ubuntu.com/security/notices/USN-4656-1

CC: (none) => thierry.vignaud
Severity: normal => major

Fedora has issued an advisory for this today (December 5):
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/6NULSZT4JH6WPRE73VQI4A42OU32HKTH/

Yeah, I wanted the 1.20.10 to run in cauldron for some days to see if there would be some problems...

I think I'll go with 1.20.10 for this fix as there also are other fixes in there...

I was going to backport 1.20.10, I'll let you handle it if you're already on top of it

(In reply to Thierry Vignaud from comment #4)
> I was going to backport 1.20.10, I'll let you handle it if you're already on
> top of it

Nah, just go ahead if you have time... I have not touched it yet.
I still need to find time for a vbox and nvidia-current fixup for Mga7

I've submitted  x11-server-1.20.10-1.1.mga7 for it

Source RPM: x11-server-1.20.9-1.mga7.src.rpm => x11-server-1.20.10-1.1.mga7

Thanks.  The update shouldn't have a subrel though.  (it's -2 in mga8 so we'll let it slide this time.  PS - don't change the srpm field in bugzilla, it's for the version the bug is reported against, not the version of the update candidate)

Source RPM: x11-server-1.20.10-1.1.mga7 => x11-server-1.20.9-1.mga7.src.rpm

I prefer to always have subrel in order to be sure next commiter has a chance to do the right thing in wase we need a further fix… :-)
"belt and suspenders"

Never add subrels when upgrading to new versions.  (it's ugly and it often will make the version-release higher than Cauldron)

Advisory:
========================

Updated x11-server packages fix security vulnerabilities:

A flaw was found in the X.Org Server. An out-of-bounds access in the XkbSetMap
function may lead to a privilege escalation vulnerability. The highest threat
from this vulnerability is to data confidentiality and integrity as well as
system availability (CVE-2020-14360).

A flaw was found in xorg-x11-server. A heap-buffer overflow in XkbSetDeviceInfo
may lead to a privilege escalation vulnerability. The highest threat from this
vulnerability is to data confidentiality and integrity as well as system
availability (CVE-2020-25712).

The x11-server package has been updated to version 1.20.10, fixing these issues
and other bugs.

References:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14360
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25712
https://lists.x.org/archives/xorg-announce/2020-December/003066.html
https://lists.x.org/archives/xorg-announce/2020-December/003067.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/6NULSZT4JH6WPRE73VQI4A42OU32HKTH/
========================

Updated packages in core/updates_testing:
========================
x11-server-1.20.10-1.1.mga7
x11-server-common-1.20.10-1.1.mga7
x11-server-xorg-1.20.10-1.1.mga7
x11-server-xnest-1.20.10-1.1.mga7
x11-server-xdmx-1.20.10-1.1.mga7
x11-server-xvfb-1.20.10-1.1.mga7
x11-server-xephyr-1.20.10-1.1.mga7
x11-server-xwayland-1.20.10-1.1.mga7
x11-server-devel-1.20.10-1.1.mga7
x11-server-source-1.20.10-1.1.mga7

from x11-server-1.20.10-1.1.mga7.src.rpm

Assignee: tmb => qa-bugs
CC: (none) => tmb

Installed and tested without issues.


No issues with desktop applications and 3D applications and games.


System: Mageia 7, x86_64, Plasma DE, LXQt DE, Intel CPU, nVidia GT 1030 GPU using nvidia-current proprietary driver.


$ uname -a
Linux marte 5.7.19-desktop-3.mga7 #1 SMP Sun Oct 18 15:46:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
$ rpm -qa | grep x11-server | sort
x11-server-common-1.20.10-1.1.mga7
x11-server-xorg-1.20.10-1.1.mga7
x11-server-xwayland-1.20.10-1.1.mga7
$ lspci | grep VGA
04:00.0 VGA compatible controller: NVIDIA Corporation GP108 [GeForce GT 1030] (rev a1)
$ cat /proc/driver/nvidia/version 
NVRM version: NVIDIA UNIX x86_64 Kernel Module  430.64  Sun Oct 27 11:26:12 UTC 2019
GCC version:  gcc version 8.4.0 (Mageia 8.4.0-1.mga7)

CC: (none) => mageia

Installed and tested on a QEMU/KVM guest system.

Tested on normal desktop and 3D applications (e.g. glmark2). No issues found.


Guest system: Mageia 7, x86_64, LXQt DE, virtio drivers.
Host system: see comment 11.


$ uname -a
Linux marte-vm-mageia-7 5.9.12-desktop-1.mga7 #1 SMP Wed Dec 2 09:05:37 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
$ rpm -qa | grep x11-server | sort
x11-server-common-1.20.10-1.1.mga7
x11-server-xorg-1.20.10-1.1.mga7
x11-server-xwayland-1.20.10-1.1.mga7
$ lspci | grep VGA
00:02.0 VGA compatible controller: Red Hat, Inc. Virtio GPU (rev 01)

No issues with 
1) M7.1 Plasma under X11-session with nvidia-current drivers.
2) M7.1 Gnome under X11-session with nvidia-current drivers.
3) M7.1 Gnome wayland-session with Intel gfx. xwayland apps (Firefox) are OK. MCC launches very well.

Also same under Virtual-Machines.

CC: (none) => ouaurelien

No issue since two days. Daily usage is OK.
SDDM works as usual. See Comment 13.

Validating update.
Advisory pushed to SVN.

Keywords: (none) => advisory, validated_update
CVE: (none) => CVE-2020-14360, CVE-2020-25712
Whiteboard: (none) => MGA7-64-OK
CC: (none) => sysadmin-bugs

An update for this issue has been pushed to the Mageia Updates repository.

https://advisories.mageia.org/MGASA-2020-0456.html

Resolution: (none) => FIXED
Status: NEW => RESOLVED