In the X.Org X server before 2017-06-19, a user authenticated to an X Session could crash or execute code in the context of the X Server by exploiting a stack overflow in the endianness conversion of X Events.
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{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "xserver-xorg-dev-hwe-16.04": "2:1.18.4-1ubuntu6.1~16.04.2", "xorg-server-source-hwe-16.04": "2:1.18.4-1ubuntu6.1~16.04.2", "xmir-hwe-16.04": "2:1.18.4-1ubuntu6.1~16.04.2", "xserver-xorg-core-hwe-16.04-dbg": "2:1.18.4-1ubuntu6.1~16.04.2", "xserver-xorg-legacy-hwe-16.04": "2:1.18.4-1ubuntu6.1~16.04.2", "xwayland-hwe-16.04": "2:1.18.4-1ubuntu6.1~16.04.2", "xserver-xephyr-hwe-16.04-dbgsym": "2:1.18.4-1ubuntu6.1~16.04.2", "xserver-xorg-core-hwe-16.04-dbgsym": "2:1.18.4-1ubuntu6.1~16.04.2", "xserver-xorg-core-hwe-16.04": "2:1.18.4-1ubuntu6.1~16.04.2", "xserver-xorg-legacy-hwe-16.04-dbgsym": "2:1.18.4-1ubuntu6.1~16.04.2", "xserver-xephyr-hwe-16.04": "2:1.18.4-1ubuntu6.1~16.04.2", "xmir-hwe-16.04-dbgsym": "2:1.18.4-1ubuntu6.1~16.04.2", "xwayland-hwe-16.04-dbgsym": "2:1.18.4-1ubuntu6.1~16.04.2" } ] }