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CVE-2025-38071

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Check return value from memblock_phys_alloc_range() At least with CONFIG_PHYSICAL_START=0x100000, if there is < 4 MiB of contiguous free memory available at this point, the kernel will crash and burn because memblock_phys_alloc_range() returns 0 on failure, which leads memblock_phys_free() to throw the first 4 MiB of physical memory to the wolves. At a minimum it should fail gracefully with a meaningful diagnostic, but in fact everything seems to work fine without the weird reserve allocation.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 10:15:40.450000
Last modified
2026-11-05 21:18:08.853000
View original CVE JSON 
{
  "id": "CVE-2025-38071",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-06-18T10:15:40.450",
  "lastModified": "2026-11-05T21:18:08.853",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Check return value from memblock_phys_alloc_range()\n\nAt least with CONFIG_PHYSICAL_START=0x100000, if there is < 4 MiB of\ncontiguous free memory available at this point, the kernel will crash\nand burn because memblock_phys_alloc_range() returns 0 on failure,\nwhich leads memblock_phys_free() to throw the first 4 MiB of physical\nmemory to the wolves.\n\nAt a minimum it should fail gracefully with a meaningful diagnostic,\nbut in fact everything seems to work fine without the weird reserve\nallocation."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/mm: Verificar el valor de retorno de memblock_phys_alloc_range(). Al menos con CONFIG_PHYSICAL_START=0x100000, si hay &lt; 4 MiB de memoria libre contigua disponible en este punto, el kernel se bloqueará porque memblock_phys_alloc_range() devuelve 0 en caso de fallo, lo que provoca que memblock_phys_free() descarte los primeros 4 MiB de memoria física. Como mínimo, debería fallar correctamente con un diagnóstico significativo, pero de hecho todo parece funcionar correctamente sin la extraña asignación de reserva."
    }
  ],
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          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
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          "role": "CISA Coordinator",
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      "source": "[email protected]",
      "type": "Primary",
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