FKIE_CVE-2025-71102

Vulnerability from fkie_nvd - Published: 2026-01-14 15:15 - Updated: 2026-03-25 18:56
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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 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). 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/062774439d442882b44f5eab8c256ad3423ef284Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08bd4c46d5e63b78e77f2605283874bbe868ab19Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1727e8bd69103a68963a5613a0ddb6d8d37df5d3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57ba40b001be27786d0570dd292289df748b306bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ef28943471a16e4f9646bc3e8e2de148e7d8d7bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a19fb3611e4c06624fc0f83ef19f4fb8d57d4751Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cfdf6250b63b953b1d8e60814c8ca96c6f9d1c8cPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.8
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
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    {
      "lang": "en",
      "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 \u0027void *\u0027 variable, but a \u0027struct task_struct *\u0027 is\ngiven.  \u0027task_scs(tsk)\u0027 is the starting address of the task\u0027s shadow call\nstack, and \u0027__scs_magic(task_scs(tsk))\u0027 is the end address of the task\u0027s\nshadow call stack.  Here should be \u0027__scs_magic(task_scs(tsk))\u0027.\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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscs: corrige un par\u00e1metro incorrecto en __scs_magic\n\n__scs_magic() necesita una variable \u0027void *\u0027, pero se le da una \u0027struct task_struct *\u0027. \u0027task_scs(tsk)\u0027 es la direcci\u00f3n de inicio de la pila de llamadas en sombra de la tarea, y \u0027__scs_magic(task_scs(tsk))\u0027 es la direcci\u00f3n final de la pila de llamadas en sombra de la tarea. Aqu\u00ed deber\u00eda ser \u0027__scs_magic(task_scs(tsk))\u0027.\n\nEl efecto visible para el usuario de este error es que cuando CONFIG_DEBUG_STACK_USAGE est\u00e1 habilitado, la funci\u00f3n de comprobaci\u00f3n de uso de la pila de llamadas en sombra (scs_check_usage) escanear\u00eda un rango de memoria incorrecto. Esto podr\u00eda llevar a\n\n1. Informes de uso de pila inexactos: La funci\u00f3n calcular\u00eda estad\u00edsticas de uso incorrectas para la pila de llamadas en sombra, potencialmente mostrando un valor incorrecto en kmsg.\n\n2. Posible ca\u00edda del kernel: Si el valor de __scs_magic(tsk) es mayor que el de __scs_magic(task_scs(tsk)), el bucle for podr\u00eda acceder a memoria no mapeada, potencialmente causando un p\u00e1nico del kernel. Sin embargo, este escenario es poco probable porque task_struct se asigna a trav\u00e9s del asignador slab (que t\u00edpicamente devuelve direcciones m\u00e1s bajas), mientras que la pila de llamadas en sombra devuelta por task_scs(tsk) se asigna a trav\u00e9s de vmalloc (que t\u00edpicamente devuelve direcciones m\u00e1s altas).\n\nSin embargo, dado que esta es puramente una caracter\u00edstica de depuraci\u00f3n (CONFIG_DEBUG_STACK_USAGE), los sistemas de producci\u00f3n normales no deber\u00edan verse afectados. El error solo afecta a desarrolladores y probadores que est\u00e1n depurando activamente el uso de la pila con esta configuraci\u00f3n habilitada."
    }
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  "id": "CVE-2025-71102",
  "lastModified": "2026-03-25T18:56:00.797",
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2026-01-14T15:15:59.210",
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}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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