CVE-2025-11234
Estado: AplazadaAlta (7.5)—
A flaw was found in QEMU. If the QIOChannelWebsock object is freed while it is waiting to complete a handshake, a GSource is leaked. This can lead to the callback firing later on and triggering a use-after-free in the use of the channel. This can be abused by a malicious client with network access to the VNC WebSocket port to cause a denial of service during the WebSocket handshake prior to the VNC client authentication.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.86%
- Percentil entre todas las CVEs puntuadas: 57
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1190Exploit Public-Facing Applicationinitial access85 % - Impacto principal
T1499.004Application or System Exploitationimpact80 %
Vector CVSS N/A sin autenticación (PR:N, UI:N) indica explotación remota sin privilegios (T1190). Acceso a puerto WebSocket VNC de QEMU permite negación de servicio por uso-after-free (T1499.004), confirmado por descripción explícita del crash de aplicación.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
CWE
- CWE-416
Referencias
- https://access.redhat.com/errata/RHSA-2025:23228
- https://access.redhat.com/errata/RHSA-2026:0326
- https://access.redhat.com/errata/RHSA-2026:0332
- https://access.redhat.com/errata/RHSA-2026:0702
- https://access.redhat.com/errata/RHSA-2026:1831
- https://access.redhat.com/errata/RHSA-2026:18772
- https://access.redhat.com/errata/RHSA-2026:22147
- https://access.redhat.com/errata/RHSA-2026:3077
- https://access.redhat.com/errata/RHSA-2026:3165
- https://access.redhat.com/errata/RHSA-2026:5578
- https://access.redhat.com/errata/RHSA-2026:59831
- https://access.redhat.com/errata/RHSA-2026:68513
- https://access.redhat.com/errata/RHSA-2026:69131
- https://access.redhat.com/security/cve/CVE-2025-11234
- https://bugzilla.redhat.com/show_bug.cgi?id=2401209
JSON original (NVD)
Mostrar
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"descriptions": [
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"value": "A flaw was found in QEMU. If the QIOChannelWebsock object is freed while it is waiting to complete a handshake, a GSource is leaked. This can lead to the callback firing later on and triggering a use-after-free in the use of the channel. This can be abused by a malicious client with network access to the VNC WebSocket port to cause a denial of service during the WebSocket handshake prior to the VNC client authentication."
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],
"lastModified": "2026-09-21T06:16:59.757",
"sourceIdentifier": "secalert@redhat.com"
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