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CVE-2026-23129

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

dpll: Prevent duplicate registrations

Modify the internal registration helpers dpll_xa_ref_{dpll,pin}_add() to reject duplicate registration attempts.

Previously, if a caller attempted to register the same pin multiple times (with the same ops, priv, and cookie) on the same device, the core silently increments the reference count and return success. This behavior is incorrect because if the caller makes these duplicate registrations then for the first one dpll_pin_registration is allocated and for others the associated dpll_pin_ref.refcount is incremented. During the first unregistration the associated dpll_pin_registration is freed and for others WARN is fired.

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Fix this by updating the logic to return `-EEXIST` if a matching registration is found to enforce a strict "register once" policy.

CVSS

Probabilidad de explotación (EPSS)

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
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  "published": "2026-02-14T15:16:08.173",
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  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: Prevent duplicate registrations\n\nModify the internal registration helpers dpll_xa_ref_{dpll,pin}_add()\nto reject duplicate registration attempts.\n\nPreviously, if a caller attempted to register the same pin multiple\ntimes (with the same ops, priv, and cookie) on the same device, the core\nsilently increments the reference count and return success. This behavior\nis incorrect because if the caller makes these duplicate registrations\nthen for the first one dpll_pin_registration is allocated and for others\nthe associated dpll_pin_ref.refcount is incremented. During the first\nunregistration the associated dpll_pin_registration is freed and for\nothers WARN is fired.\n\nFix this by updating the logic to return `-EEXIST` if a matching\nregistration is found to enforce a strict \"register once\" policy."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndpll: Prevenir registros duplicados\n\nModificar las funciones auxiliares de registro internas dpll_xa_ref_{dpll,pin}_add() para rechazar intentos de registro duplicados.\n\nAnteriormente, si un llamador intentaba registrar el mismo pin múltiples veces (con las mismas ops, priv y cookie) en el mismo dispositivo, el núcleo incrementaba silenciosamente el contador de referencias y devolvía éxito. Este comportamiento es incorrecto porque si el llamador realiza estos registros duplicados, entonces para el primero se asigna dpll_pin_registration y para los demás se incrementa el dpll_pin_ref.refcount asociado. Durante la primera anulación de registro se libera el dpll_pin_registration asociado y para los demás se dispara una advertencia.\n\nEsto se soluciona actualizando la lógica para devolver -EEXIST si se encuentra un registro coincidente, para aplicar una política estricta de 'registrar una vez'."
    }
  ],
  "lastModified": "2026-06-17T10:20:57.200",
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