Use After Free The advisory has been revoked - it doesn't affect any version of package xorg-x11-server (opens in a new tab)

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Snyk IDSNYK-RHEL8-XORGX11SERVER-17223545
published7 Jun 2026
disclosed2 Jun 2026

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Introduced: 2 Jun 2026

CVE-2026-50260 (opens in a new tab) CWE-416 (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:8.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xorg-x11-server package and not the xorg-x11-server package as distributed by RHEL.

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.