CVE-2025-38445

Estado: AnalizadaAlta (7.1)—

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

md/raid1: Fix stack memory use after return in raid1_reshape

In the raid1_reshape function, newpool is allocated on the stack and assigned to conf->r1bio_pool. This results in conf->r1bio_pool.wait.head pointing to a stack address. Accessing this address later can lead to a kernel panic.

Example access path:

Fix: reinit conf->r1bio_pool.wait after assigning newpool.

Detalles técnicos trazas, registros y código del informe original

raid1_reshape()
{
	// newpool is on the stack
	mempool_t newpool, oldpool;
	// initialize newpool.wait.head to stack address
	mempool_init(&newpool, ...);
	conf->r1bio_pool = newpool;
}

raid1_read_request() or raid1_write_request()
{
	alloc_r1bio()
	{
		mempool_alloc()
		{
			// if pool->alloc fails
			remove_element()
			{
				--pool->curr_nr;
			}
		}
	}
}

mempool_free()
{
	if (pool->curr_nr < pool->min_nr) {
		// pool->wait.head is a stack address
		// wake_up() will try to access this invalid address
		// which leads to a kernel panic
		return;
		wake_up(&pool->wait);
	}
}

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Puntuación base: 7.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.18%
Percentil entre todas las CVEs puntuadas: 7
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1499.004 Application or System Exploitationimpact80 %

CVE de kernel Linux (AV:L, PR:L, sin UI). Escalada via corrupción de memoria (stack use-after-free en CWE-125) al acceder a conf->r1bio_pool.wait en dirección de stack inválida. Causa DoS (panic del kernel) e impacto de privilegios.

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

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (2)

Debian — Debian Linux Linux — Linux Kernel

CWE

CWE-125

Referencias

JSON original (NVD)

Mostrar

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  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid1: Fix stack memory use after return in raid1_reshape\n\nIn the raid1_reshape function, newpool is\nallocated on the stack and assigned to conf->r1bio_pool.\nThis results in conf->r1bio_pool.wait.head pointing\nto a stack address.\nAccessing this address later can lead to a kernel panic.\n\nExample access path:\n\nraid1_reshape()\n{\n\t// newpool is on the stack\n\tmempool_t newpool, oldpool;\n\t// initialize newpool.wait.head to stack address\n\tmempool_init(&newpool, ...);\n\tconf->r1bio_pool = newpool;\n}\n\nraid1_read_request() or raid1_write_request()\n{\n\talloc_r1bio()\n\t{\n\t\tmempool_alloc()\n\t\t{\n\t\t\t// if pool->alloc fails\n\t\t\tremove_element()\n\t\t\t{\n\t\t\t\t--pool->curr_nr;\n\t\t\t}\n\t\t}\n\t}\n}\n\nmempool_free()\n{\n\tif (pool->curr_nr < pool->min_nr) {\n\t\t// pool->wait.head is a stack address\n\t\t// wake_up() will try to access this invalid address\n\t\t// which leads to a kernel panic\n\t\treturn;\n\t\twake_up(&pool->wait);\n\t}\n}\n\nFix:\nreinit conf->r1bio_pool.wait after assigning newpool."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: md/raid1: Corregir el uso de memoria de la pila después del retorno en raid1_reshape En la función raid1_reshape, newpool se asigna en la pila y a conf-&gt;r1bio_pool. Esto da como resultado que conf-&gt;r1bio_pool.wait.head apunte a una dirección de pila. Acceder a esta dirección más tarde puede provocar un pánico del kernel. Ejemplo de ruta de acceso: raid1_reshape() { // newpool está en la pila mempool_t newpool, oldpool; // inicializar newpool.wait.head en la dirección de la pila mempool_init(&amp;newpool, ...); conf-&gt;r1bio_pool = newpool; } raid1_read_request() o raid1_write_request() { alloc_r1bio() { mempool_alloc() { // si pool-&gt;alloc falla remove_element() { --pool-&gt;curr_nr; } } } } mempool_free() { if (pool-&gt;curr_nr &lt; pool-&gt;min_nr) { // pool-&gt;wait.head es una dirección de pila // wake_up() intentará acceder a esta dirección no válida // lo que genera un pánico del kernel return; wake_up(&amp;pool-&gt;wait); } } Solución: reinicie conf-&gt;r1bio_pool.wait después de asignar newpool."
    }
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  "lastModified": "2026-06-17T09:16:52.257",
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