CVE-2025-71102 (GCVE-0-2025-71102)
Vulnerability from cvelistv5
Published
2026-01-14 15:05
Modified
2026-02-09 08:34
Severity ?
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
Impacted products
Vendor Product Version
Linux Linux Version: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2
Version: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2
Version: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2
Version: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2
Version: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2
Version: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2
Version: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2
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{
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      "descriptions": [
        {
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:34:55.111Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/1727e8bd69103a68963a5613a0ddb6d8d37df5d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/cfdf6250b63b953b1d8e60814c8ca96c6f9d1c8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/57ba40b001be27786d0570dd292289df748b306b"
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          "url": "https://git.kernel.org/stable/c/062774439d442882b44f5eab8c256ad3423ef284"
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          "url": "https://git.kernel.org/stable/c/a19fb3611e4c06624fc0f83ef19f4fb8d57d4751"
        },
        {
          "url": "https://git.kernel.org/stable/c/08bd4c46d5e63b78e77f2605283874bbe868ab19"
        }
      ],
      "title": "scs: fix a wrong parameter in __scs_magic",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71102",
    "datePublished": "2026-01-14T15:05:52.389Z",
    "dateReserved": "2026-01-13T15:30:19.651Z",
    "dateUpdated": "2026-02-09T08:34:55.111Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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