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CVE Watch5 ago 2026

CVE-2026-50257

A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers ca

CVSS

7.8

Alto

EPSS

0.1%

p4

KEV

—

Exploit Today

1

0-100

Publicado: 5 jun 2026 · Última mod.: 5 ago 2026 · CWE-416

EPSS · 30d
0.1%EPSS · 30 días0.1%
2026-08-052026-09-02
Descripción técnica

A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.

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