USN-6587-4: X.Org X Server regression

USN-6587-1 fixed vulnerabilities in X.Org X Server. The fix was incomplete
resulting in a possible regression. This update fixes the problem.

Original advisory details:

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
memory when processing the DeviceFocusEvent and ProcXIQueryPointer APIs. An
attacker could possibly use this issue to cause the X Server to crash,
obtain sensitive information, or execute arbitrary code. (CVE-2023-6816)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled
reattaching to a different master device. …

advisory apis attacker fix fixes issue memory org problem server update usn vulnerabilities x.org