CVE Watch27 jul 2026

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

CVSS

7.8

Alto

EPSS

0.2%

KEV

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Exploit Today

0-100

Publicado: 5 jun 2026 · Última mod.: 27 jul 2026 · CWE-416

EPSS · 30d

0.2%EPSS · 30 días0.2%

2026-07-022026-07-30

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.

Referencias oficiales

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