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CVE-2024-48881

Estado: ModificadaMedia (5.5)—

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

bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again

Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in node allocations") leads a NULL pointer deference in cache_set_flush().

>From the above code in cache_set_flush(), if previous registration code fails before allocating c->root, it is possible c->root is NULL as what it is initialized. __bch_btree_node_alloc() never returns NULL but c->root is possible to be NULL at above line 1721.

This patch replaces IS_ERR() by IS_ERR_OR_NULL() to fix this.

Detalles técnicos trazas, registros y código del informe original
1721         if (!IS_ERR_OR_NULL(c->root))
1722                 list_add(&c->root->list, &c->btree_cache);

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)

Mostrar
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcache: revert replacing IS_ERR_OR_NULL with IS_ERR again\n\nCommit 028ddcac477b (\"bcache: Remove unnecessary NULL point check in\nnode allocations\") leads a NULL pointer deference in cache_set_flush().\n\n1721         if (!IS_ERR_OR_NULL(c->root))\n1722                 list_add(&c->root->list, &c->btree_cache);\n\n>From the above code in cache_set_flush(), if previous registration code\nfails before allocating c->root, it is possible c->root is NULL as what\nit is initialized. __bch_btree_node_alloc() never returns NULL but\nc->root is possible to be NULL at above line 1721.\n\nThis patch replaces IS_ERR() by IS_ERR_OR_NULL() to fix this."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bcache: revertir el reemplazo de IS_ERR_OR_NULL con IS_ERR nuevamente. El commit 028ddcac477b (\"bcache: eliminar la comprobación innecesaria del punto NULL en las asignaciones de nodos\") conduce a una deferencia de puntero NULL en cache_set_flush(). 1721 if (!IS_ERR_OR_NULL(c->root)) 1722 list_add(&c->root->list, &c->btree_cache); >Del código anterior en cache_set_flush(), si el código de registro anterior falla antes de asignar c->root, es posible que c->root sea NULL como lo que se inicializa. __bch_btree_node_alloc() nunca devuelve NULL, pero es posible que c->root sea NULL en la línea 1721 anterior. Este parche reemplaza IS_ERR() por IS_ERR_OR_NULL() para solucionar esto."
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