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CVE-2024-47809

Estado: ModificadaMedia (5.5)—

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

dlm: fix possible lkb_resource null dereference

This patch fixes a possible null pointer dereference when this function is called from request_lock() as lkb->lkb_resource is not assigned yet, only after validate_lock_args() by calling attach_lkb(). Another issue is that a resource name could be a non printable bytearray and we cannot assume to be ASCII coded.

The log functionality is probably never being hit when DLM is used in normal way and no debug logging is enabled.

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The null pointer dereference can only occur on a new created lkb that does not have the resource assigned yet, it probably never hits the null pointer dereference but we should be sure that other changes might not change this behaviour and we actually can hit the mentioned null pointer dereference.

In this patch we just drop the printout of the resource name, the lkb id is enough to make a possible connection to a resource name if this exists.

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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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndlm: fix possible lkb_resource null dereference\n\nThis patch fixes a possible null pointer dereference when this function is\ncalled from request_lock() as lkb->lkb_resource is not assigned yet,\nonly after validate_lock_args() by calling attach_lkb(). Another issue\nis that a resource name could be a non printable bytearray and we cannot\nassume to be ASCII coded.\n\nThe log functionality is probably never being hit when DLM is used in\nnormal way and no debug logging is enabled. The null pointer dereference\ncan only occur on a new created lkb that does not have the resource\nassigned yet, it probably never hits the null pointer dereference but we\nshould be sure that other changes might not change this behaviour and we\nactually can hit the mentioned null pointer dereference.\n\nIn this patch we just drop the printout of the resource name, the lkb id\nis enough to make a possible connection to a resource name if this\nexists."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dlm: arregla posible desreferencia nula de lkb_resource Este parche corrige una posible desreferencia de puntero nulo cuando se llama a esta función desde request_lock() ya que lkb->lkb_resource aún no está asignado, solo después de validar_lock_args() llamando a attached_lkb(). Otro problema es que un nombre de recurso podría ser un bytearray no imprimible y no podemos asumir que esté codificado en ASCII. Es probable que la funcionalidad de registro nunca se vea afectada cuando se usa DLM de forma normal y no se habilita ningún registro de depuración. La desreferencia de puntero nulo solo puede ocurrir en un lkb creado recientemente que aún no tenga el recurso asignado, probablemente nunca llegue a la desreferencia de puntero nulo, pero debemos estar seguros de que otros cambios podrían no cambiar este comportamiento y realmente podemos llegar a la desreferencia de puntero nulo mencionada. En este parche simplemente omitimos la impresión del nombre del recurso, el id de lkb es suficiente para hacer una posible conexión con un nombre de recurso si existe."
    }
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