Ubuntu Security Notice 6453-2 - USN-6453-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled prepending values to certain properties. An attacker could possibly use this issue to cause the X Server to crash, execute arbitrary code, or escalate privileges.
89f1be48ed5cce8b06a6488cd2af46b1ad1433239e258f605714fac81856c050Ubuntu Security Notice 6453-1 - Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled prepending values to certain properties. An attacker could possibly use this issue to cause the X Server to crash, execute arbitrary code, or escalate privileges. Sri discovered that the X.Org X Server incorrectly handled destroying windows in certain legacy multi-screen setups. An attacker could possibly use this issue to cause the X Server to crash, execute arbitrary code, or escalate privileges.
c2c6ee124f31fc5cfe2f269fc319393d122f370639f673b1bfb2bbba8f0bb1f9Debian Linux Security Advisory 5534-1 - Jan-Niklas Sohn discovered several vulnerabilities in the Xorg X server, which may result in privilege escalation if the X server is running privileged.
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