CVE-2026-50260 Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()

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...

CVE-2026-50260

The CVE-2026-50260 entry concerns the X.Org X server and Xwayland, where a use-after-free in FreeCounter() can be triggered by a client that sets up multiple SyncCounters and destroys them via a second client connection. The consequence is potential server crash and, if the X server runs as root,...

CVE-2026-50260

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...

PT-2026-46940

Name of the Vulnerable Software and Affected Versions X.Org X server affected versions not specified Xwayland affected versions not specified Description A use-after-free flaw exists in the FreeCounter function. This occurs when a client establishes multiple SyncCounters and awaits their triggers...

PT-2026-46941

Name of the Vulnerable Software and Affected Versions X.Org X server affected versions not specified Xwayland affected versions not specified Description A use-after-free flaw exists in the SyncChangeCounter function. A client that establishes multiple SyncCounters can trigger this condition by...