CVE-2025-71143
Estado: AnalizadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
clk: samsung: exynos-clkout: Assign .num before accessing .hws
Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with __counted_by") annotated the hws member of 'struct clk_hw_onecell_data' with __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS) about the number of elements in .hws[], so that it can warn when .hws[] is accessed out of bounds.
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As noted in that change, the __counted_by member must be initialized with the number of elements before the first array access happens, otherwise there will be a warning from each access prior to the initialization because the number of elements is zero. This occurs in exynos_clkout_probe() due to .num being assigned after .hws[] has been accessed:
Move the .num initialization to before the first access of .hws[], clearing up the warning.
Detalles técnicos trazas, registros y código del informe original
UBSAN: array-index-out-of-bounds in drivers/clk/samsung/clk-exynos-clkout.c:178:18 index 0 is out of range for type 'clk_hw *[*]'
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.14%
- Percentil entre todas las CVEs puntuadas: 3
- 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
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1499.004Application or System Exploitationimpact60 %
Acceso local sin interacción (AV:L/PR:L/UI:N) en kernel Linux permite escalada; out-of-bounds podría causar DoS o corrupción de memoria.
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
- CWE-129
Referencias
JSON original (NVD)
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclk: samsung: exynos-clkout: Assign .num before accessing .hws\n\nCommit f316cdff8d67 (\"clk: Annotate struct clk_hw_onecell_data with\n__counted_by\") annotated the hws member of 'struct clk_hw_onecell_data'\nwith __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS)\nabout the number of elements in .hws[], so that it can warn when .hws[]\nis accessed out of bounds. As noted in that change, the __counted_by\nmember must be initialized with the number of elements before the first\narray access happens, otherwise there will be a warning from each access\nprior to the initialization because the number of elements is zero. This\noccurs in exynos_clkout_probe() due to .num being assigned after .hws[]\nhas been accessed:\n\n UBSAN: array-index-out-of-bounds in drivers/clk/samsung/clk-exynos-clkout.c:178:18\n index 0 is out of range for type 'clk_hw *[*]'\n\nMove the .num initialization to before the first access of .hws[],\nclearing up the warning."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nclk: samsung: exynos-clkout: Asignar .num antes de acceder a .hws\n\nEl commit f316cdff8d67 ('clk: Anotar struct clk_hw_onecell_data con __counted_by') anotó el miembro hws de 'struct clk_hw_onecell_data' con __counted_by, lo que informa al sanitizador de límites (UBSAN_BOUNDS) sobre el número de elementos en .hws[], para que pueda advertir cuando se accede a .hws[] fuera de los límites. Como se señaló en ese cambio, el miembro __counted_by debe inicializarse con el número de elementos antes de que ocurra el primer acceso al array, de lo contrario, habrá una advertencia de cada acceso anterior a la inicialización porque el número de elementos es cero. Esto ocurre en exynos_clkout_probe() debido a que .num se asigna después de que se haya accedido a .hws[]:\n\n UBSAN: array-index-out-of-bounds en drivers/clk/samsung/clk-exynos-clkout.c:178:18\n el índice 0 está fuera de rango para el tipo 'clk_hw *[*]'\n\nMover la inicialización de .num a antes del primer acceso a .hws[], eliminando la advertencia."
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