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CVE-2025-26595

Estado: ModificadaAlta (7.8)—

A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size.

CVSS

Probabilidad de explotación (EPSS)

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.

Buffer overflow en XkbVModMaskText() con acceso local (AV:L) y privilegios L (PR:L) sin interacción (UI:N) permite escalada a código ejecutable. CVSS I:H/A:H confirma ejecución con impacto alto.

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

Restrict Web-Based ContentExecution PreventionThreat Intelligence ProgramPrivileged Account ManagementNetwork Intrusion PreventionLimit Software Installation

Tecnologías afectadas (4)

Redhat — Enterprise LinuxTigervnc — TigervncX.org — X ServerX.org — Xwayland

CWE

Referencias

JSON original (NVD)

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  "sourceIdentifier": "secalert@redhat.com"
}