CVE-2026-31447
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
ext4: reject mount if bigalloc with s_first_data_block != 0
bigalloc with s_first_data_block != 0 is not supported, reject mounting it.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 5/10/2026
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
T1203Exploitation for Client Executionexecution85 % - Impacto principal
T1068Exploitation for Privilege Escalationprivilege escalation75 %
Requiere interacción del usuario (UI:R) para montar un sistema de archivos ext4 preparado, permitiendo elevar privilegios locales en el kernel con acceso de lectura, escritura y disponibilidad.
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)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/3822743dc20386d9897e999dbb990befa3a5b3f8
- https://git.kernel.org/stable/c/3a926957cc95899ef88529710836edadc03c71a1
- https://git.kernel.org/stable/c/5ad6d994255e27a3254079dfb50ca861fc31f2d0
- https://git.kernel.org/stable/c/7b58c110b4e1f028eb38eec9ed3555e9be81c8b0
- https://git.kernel.org/stable/c/7d5b04290156c3fc316eecc86a4f9d201ab7d44a
- https://git.kernel.org/stable/c/ad1f6d608f33f59d21a3d025615d6786a6443998
- https://git.kernel.org/stable/c/b77de3fceafbb39f30e4ff5dc986f863d5456417
- https://git.kernel.org/stable/c/d787d3ae96648dc14a3b7ca8fde817177e82c1c7
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
JSON original (NVD)
Mostrar
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