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CVE-2025-38445

Full vulnerability record from the local CVENow database.

Description

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

Severity
HIGH
CVSS score
7.1 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-07-25 16:15:29.980000
Last modified
2026-11-05 21:18:32.113000
View original CVE JSON 
{
  "id": "CVE-2025-38445",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-07-25T16:15:29.980",
  "lastModified": "2026-11-05T21:18:32.113",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "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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