CVE-2025-71102
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
scs: fix a wrong parameter in __scs_magic
__scs_magic() needs a 'void *' variable, but a 'struct task_struct *' is given. 'task_scs(tsk)' is the starting address of the task's shadow call stack, and '__scs_magic(task_scs(tsk))' is the end address of the task's shadow call stack. Here should be '__scs_magic(task_scs(tsk))'.
The user-visible effect of this bug is that when CONFIG_DEBUG_STACK_USAGE is enabled, the shadow call stack usage checking function (scs_check_usage) would scan an incorrect memory range. This could lead
However, since this is purely a debugging feature (CONFIG_DEBUG_STACK_USAGE), normal production systems should be not unaffected. The bug only impacts developers and testers who are actively debugging stack usage with this configuration enabled.
Detalles técnicos trazas, registros y código del informe original
1. **Inaccurate stack usage reporting**: The function would calculate wrong usage statistics for the shadow call stack, potentially showing incorrect value in kmsg. 2. **Potential kernel crash**: If the value of __scs_magic(tsk)is greater than that of __scs_magic(task_scs(tsk)), the for loop may access unmapped memory, potentially causing a kernel panic. However, this scenario is unlikely because task_struct is allocated via the slab allocator (which typically returns lower addresses), while the shadow call stack returned by task_scs(tsk) is allocated via vmalloc(which typically returns higher addresses).
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
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: 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).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/062774439d442882b44f5eab8c256ad3423ef284
- https://git.kernel.org/stable/c/08bd4c46d5e63b78e77f2605283874bbe868ab19
- https://git.kernel.org/stable/c/1727e8bd69103a68963a5613a0ddb6d8d37df5d3
- https://git.kernel.org/stable/c/57ba40b001be27786d0570dd292289df748b306b
- https://git.kernel.org/stable/c/9ef28943471a16e4f9646bc3e8e2de148e7d8d7b
- https://git.kernel.org/stable/c/a19fb3611e4c06624fc0f83ef19f4fb8d57d4751
- https://git.kernel.org/stable/c/cfdf6250b63b953b1d8e60814c8ca96c6f9d1c8c
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscs: fix a wrong parameter in __scs_magic\n\n__scs_magic() needs a 'void *' variable, but a 'struct task_struct *' is\ngiven. 'task_scs(tsk)' is the starting address of the task's shadow call\nstack, and '__scs_magic(task_scs(tsk))' is the end address of the task's\nshadow call stack. Here should be '__scs_magic(task_scs(tsk))'.\n\nThe user-visible effect of this bug is that when CONFIG_DEBUG_STACK_USAGE\nis enabled, the shadow call stack usage checking function\n(scs_check_usage) would scan an incorrect memory range. This could lead\n\n1. **Inaccurate stack usage reporting**: The function would calculate\n wrong usage statistics for the shadow call stack, potentially showing\n incorrect value in kmsg.\n\n2. **Potential kernel crash**: If the value of __scs_magic(tsk)is\n greater than that of __scs_magic(task_scs(tsk)), the for loop may\n access unmapped memory, potentially causing a kernel panic. However,\n this scenario is unlikely because task_struct is allocated via the slab\n allocator (which typically returns lower addresses), while the shadow\n call stack returned by task_scs(tsk) is allocated via vmalloc(which\n typically returns higher addresses).\n\nHowever, since this is purely a debugging feature\n(CONFIG_DEBUG_STACK_USAGE), normal production systems should be not\nunaffected. The bug only impacts developers and testers who are actively\ndebugging stack usage with this configuration enabled."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscs: corrige un parámetro incorrecto en __scs_magic\n\n__scs_magic() necesita una variable 'void *', pero se le da una 'struct task_struct *'. 'task_scs(tsk)' es la dirección de inicio de la pila de llamadas en sombra de la tarea, y '__scs_magic(task_scs(tsk))' es la dirección final de la pila de llamadas en sombra de la tarea. Aquí debería ser '__scs_magic(task_scs(tsk))'.\n\nEl efecto visible para el usuario de este error es que cuando CONFIG_DEBUG_STACK_USAGE está habilitado, la función de comprobación de uso de la pila de llamadas en sombra (scs_check_usage) escanearía un rango de memoria incorrecto. Esto podría llevar a\n\n1. Informes de uso de pila inexactos: La función calcularía estadísticas de uso incorrectas para la pila de llamadas en sombra, potencialmente mostrando un valor incorrecto en kmsg.\n\n2. Posible caída del kernel: Si el valor de __scs_magic(tsk) es mayor que el de __scs_magic(task_scs(tsk)), el bucle for podría acceder a memoria no mapeada, potencialmente causando un pánico del kernel. Sin embargo, este escenario es poco probable porque task_struct se asigna a través del asignador slab (que típicamente devuelve direcciones más bajas), mientras que la pila de llamadas en sombra devuelta por task_scs(tsk) se asigna a través de vmalloc (que típicamente devuelve direcciones más altas).\n\nSin embargo, dado que esta es puramente una característica de depuración (CONFIG_DEBUG_STACK_USAGE), los sistemas de producción normales no deberían verse afectados. El error solo afecta a desarrolladores y probadores que están depurando activamente el uso de la pila con esta configuración habilitada."
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