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X.Org X Server 'PassMessage' Request Local Privilege Escalation Vulnerability

X.Org X Server is prone to a local privilege-escalation vulnerability.

Attackers can exploit this issue to execute arbitrary code with superuser privileges. Successfully exploiting this issue will result in the complete compromise of an affected computer. Failed exploit attempts will likely crash the computer.

NOTE: This vulnerability was previously covered in BID 27336 (X.Org X Server Multiple Local Privilege Escalation and Information Disclosure Vulnerabilities), but has been given its own record to better document the issue.