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CVE-2024-53193

Estado: ModificadaAlta (7.8)—

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

clk: clk-loongson2: Fix memory corruption bug in struct loongson2_clk_provider

Some heap space is allocated for the flexible structure `struct clk_hw_onecell_data` and its flexible-array member `hws` through the composite structure `struct loongson2_clk_provider` in function `loongson2_clk_probe()`, as shown below:

Then some data is written into the flexible array:

This corrupts `clk_lock`, which is the spinlock variable immediately following the `clk_data` member in `struct loongson2_clk_provider`:

The problem is that the flexible structure is currently placed in the middle of `struct loongson2_clk_provider` instead of at the end.

Leer descripción completaMostrar menos

Fix this by moving `struct clk_hw_onecell_data clk_data;` to the end of `struct loongson2_clk_provider`. Also, add a code comment to help prevent this from happening again in case new members are added to the structure in the future.

drivers/clk/clk-loongson2.c:32:36: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Detalles técnicos trazas, registros y código del informe original
289         struct loongson2_clk_provider *clp;
	...
296         for (p = data; p->name; p++)
297                 clks_num++;
298
299         clp = devm_kzalloc(dev, struct_size(clp, clk_data.hws, clks_num),
300                            GFP_KERNEL);

350                 clp->clk_data.hws[p->id] = hw;

struct loongson2_clk_provider {
	void __iomem *base;
	struct device *dev;
	struct clk_hw_onecell_data clk_data;
	spinlock_t clk_lock;	/* protect access to DIV registers */
};

This change also fixes the following -Wflex-array-member-not-at-end
warning:

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso local (AV:L) sin interacción del usuario permite corrupción de memoria (CWE-787) que sobrescribe spinlock, habilitando escalada de privilegios y ejecución de código en kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data Storage

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2024-53193",
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          "version": "2.0.3",
          "timestamp": "2025-10-01T20:04:04.188198Z"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclk: clk-loongson2: Fix memory corruption bug in struct loongson2_clk_provider\n\nSome heap space is allocated for the flexible structure `struct\nclk_hw_onecell_data` and its flexible-array member `hws` through\nthe composite structure `struct loongson2_clk_provider` in function\n`loongson2_clk_probe()`, as shown below:\n\n289         struct loongson2_clk_provider *clp;\n\t...\n296         for (p = data; p->name; p++)\n297                 clks_num++;\n298\n299         clp = devm_kzalloc(dev, struct_size(clp, clk_data.hws, clks_num),\n300                            GFP_KERNEL);\n\nThen some data is written into the flexible array:\n\n350                 clp->clk_data.hws[p->id] = hw;\n\nThis corrupts `clk_lock`, which is the spinlock variable immediately\nfollowing the `clk_data` member in `struct loongson2_clk_provider`:\n\nstruct loongson2_clk_provider {\n\tvoid __iomem *base;\n\tstruct device *dev;\n\tstruct clk_hw_onecell_data clk_data;\n\tspinlock_t clk_lock;\t/* protect access to DIV registers */\n};\n\nThe problem is that the flexible structure is currently placed in the\nmiddle of `struct loongson2_clk_provider` instead of at the end.\n\nFix this by moving `struct clk_hw_onecell_data clk_data;` to the end of\n`struct loongson2_clk_provider`. Also, add a code comment to help\nprevent this from happening again in case new members are added to the\nstructure in the future.\n\nThis change also fixes the following -Wflex-array-member-not-at-end\nwarning:\n\ndrivers/clk/clk-loongson2.c:32:36: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: clk: clk-loongson2: Se corrige un error de corrupción de memoria en struct loongson2_clk_provider. Se asigna algo de espacio de montón para la estructura flexible `struct clk_hw_onecell_data` y su miembro de matriz flexible `hws` a través de la estructura compuesta `struct loongson2_clk_provider` en la función `loongson2_clk_probe()`, como se muestra a continuación: 289 struct loongson2_clk_provider *clp; ... 296 for (p = data; p->name; p++) 297 clks_num++; 298 299 clp = devm_kzalloc(dev, struct_size(clp, clk_data.hws, clks_num), 300 GFP_KERNEL); Luego, se escriben algunos datos en la matriz flexible: 350 clp->clk_data.hws[p->id] = hw; Esto corrompe `clk_lock`, que es la variable spinlock que sigue inmediatamente al miembro `clk_data` en `struct loongson2_clk_provider`: struct loongson2_clk_provider { void __iomem *base; struct device *dev; struct clk_hw_onecell_data clk_data; spinlock_t clk_lock; /* proteger el acceso a los registros DIV */ }; El problema es que la estructura flexible actualmente está ubicada en el medio de `struct loongson2_clk_provider` en lugar de al final. Solucione esto moviendo `struct clk_hw_onecell_data clk_data;` al final de `struct loongson2_clk_provider`. Además, agregue un comentario de código para ayudar a evitar que esto vuelva a suceder en caso de que se agreguen nuevos miembros a la estructura en el futuro. Este cambio también corrige la siguiente advertencia -Wflex-array-member-not-at-end: drivers/clk/clk-loongson2.c:32:36: advertencia: la estructura que contiene un miembro de matriz flexible no está al final de otra estructura [-Wflex-array-member-not-at-end]"
    }
  ],
  "lastModified": "2026-06-17T08:08:33.327",
  "configurations": [
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}