CVE-2025-71102 (GCVE-0-2025-71102)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:05 – Updated: 2026-05-11 21:54
VLAI
Title
scs: fix a wrong parameter in __scs_magic
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6640 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 1727e8bd69103a68963a5613a0ddb6d8d37df5d3 (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < cfdf6250b63b953b1d8e60814c8ca96c6f9d1c8c (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 57ba40b001be27786d0570dd292289df748b306b (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 062774439d442882b44f5eab8c256ad3423ef284 (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 9ef28943471a16e4f9646bc3e8e2de148e7d8d7b (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < a19fb3611e4c06624fc0f83ef19f4fb8d57d4751 (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 08bd4c46d5e63b78e77f2605283874bbe868ab19 (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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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 \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."
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          {
            "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."
          }
        ],
        "id": "CVE-2025-71102",
        "lastModified": "2026-06-17T10:03:40.040",
        "metrics": {
          "cvssMetricV31": [
            {
              "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-01-14T15:15:59.210",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/062774439d442882b44f5eab8c256ad3423ef284"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/08bd4c46d5e63b78e77f2605283874bbe868ab19"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1727e8bd69103a68963a5613a0ddb6d8d37df5d3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/57ba40b001be27786d0570dd292289df748b306b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/9ef28943471a16e4f9646bc3e8e2de148e7d8d7b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a19fb3611e4c06624fc0f83ef19f4fb8d57d4751"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/cfdf6250b63b953b1d8e60814c8ca96c6f9d1c8c"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-11-07T04:43:27+00:00",
      "cve": "CVE-2025-71102",
      "id": "CVE-2025-71102",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scs: fix a wrong parameter in __scs_magic",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-71102.json",
      "version": "3"
    }
  }
}



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