Ubuntu Security Notice USN-5193-2 ≈ Packet Storm

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Ubuntu Security Notice USN-5193-2^[6]: Authored by Ubuntu ^[7] | Site security.ubuntu.com ^[8]; Ubuntu Security Notice 5193-2 - USN-5193-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled certain inputs. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges.; systems | linux ^[9], ubuntu ^[10]; advisories | CVE-2021-4008 ^[11]; MD5 | 410a94566c5c5fbb672c4ed97715a6e1; Download ^[12] | Favorite ^[13] | View ^[14]

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Ubuntu Security Notice USN-5193-2
January 26, 2022
xorg-server vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in X.Org X Server.
Software Description:
- xorg-server: X.Org X11 server
Details:
USN-5193-1 fixed several vulnerabilities in X.Org. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory details:
Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
certain inputs. An attacker could use this issue to cause the server to
crash, resulting in a denial of service, or possibly execute arbitrary
code and escalate privileges.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 ESM:
xserver-xorg-core               2:1.18.4-0ubuntu0.12+esm1
Ubuntu 14.04 ESM:
xserver-xorg-core               2:1.15.1-0ubuntu2.11+esm5
After a standard system update you need to reboot your computer to make all
the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5193-2
https://ubuntu.com/security/notices/USN-5193-1
CVE-2021-4008, CVE-2021-4009, CVE-2021-4011