Vulnerabilities CVE-2026-50260

CVE-2026-50260

High

Open

TLP:CLEAR

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

NVD CVE.org

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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.

Details

CVSS Score: 7.8
EPSS Score ⓘ: 0.15%

5th percentile
CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Confidence: 90%
Published: Jun 5, 2026
Last Modified: Aug 4, 2026

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