[CVE-2026-50260] A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that s…

Descripción técnica

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.

Puntuación CVSS

Score: 7.8/10 — Severidad: HIGH — Estado NIST: Modified

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Productos afectados

X server, Xwayland, Enterprise linux — X.org, Redhat

Debilidades (CWE)

CWE-416

Fuente oficial

Publicado en NIST NVD.