Security Advisory

CVE-2026-50261

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-05 10:36:33

Last updated 2026-07-15 00:46:55

Assigner redhat

CVSS score not scored

State PUBLISHED

Description

A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.

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