Security Advisory

CVE-2026-50260

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-05 10:36:30

Last updated 2026-07-15 00:46:58

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 FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.

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