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CVE-2025-39788

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE On Google gs101, the number of UTP transfer request slots (nutrs) is 32, and in this case the driver ends up programming the UTRL_NEXUS_TYPE incorrectly as 0. This is because the left hand side of the shift is 1, which is of type int, i.e. 31 bits wide. Shifting by more than that width results in undefined behaviour. Fix this by switching to the BIT() macro, which applies correct type casting as required. This ensures the correct value is written to UTRL_NEXUS_TYPE (0xffffffff on gs101), and it also fixes a UBSAN shift warning: UBSAN: shift-out-of-bounds in drivers/ufs/host/ufs-exynos.c:1113:21 shift exponent 32 is too large for 32-bit type 'int' For consistency, apply the same change to the nutmrs / UTMRL_NEXUS_TYPE write.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-11 17:15:45.070000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON 
{
  "id": "CVE-2025-39788",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-11T17:15:45.070",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE\n\nOn Google gs101, the number of UTP transfer request slots (nutrs) is 32,\nand in this case the driver ends up programming the UTRL_NEXUS_TYPE\nincorrectly as 0.\n\nThis is because the left hand side of the shift is 1, which is of type\nint, i.e. 31 bits wide. Shifting by more than that width results in\nundefined behaviour.\n\nFix this by switching to the BIT() macro, which applies correct type\ncasting as required. This ensures the correct value is written to\nUTRL_NEXUS_TYPE (0xffffffff on gs101), and it also fixes a UBSAN shift\nwarning:\n\n    UBSAN: shift-out-of-bounds in drivers/ufs/host/ufs-exynos.c:1113:21\n    shift exponent 32 is too large for 32-bit type 'int'\n\nFor consistency, apply the same change to the nutmrs / UTMRL_NEXUS_TYPE\nwrite."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nscsi: ufs: exynos: Corrección de la programación de HCI_UTRL_NEXUS_TYPE\n\nEn Google gs101, el número de ranuras de solicitud de transferencia UTP (nutrs) es 32, y en este caso el controlador termina programando el UTRL_NEXUS_TYPE incorrectamente como 0.\n\nEsto se debe a que el lado izquierdo del desplazamiento es 1, que es de tipo int, es decir, de 31 bits de ancho. Desplazar por más de ese ancho resulta en comportamiento indefinido.\n\nSolucione esto cambiando a la macro BIT(), que aplica la conversión de tipo correcta según sea necesario. Esto asegura que el valor correcto se escriba en UTRL_NEXUS_TYPE (0xffffffff en gs101), y también corrige una advertencia de desplazamiento de UBSAN:\n\n    UBSAN: desplazamiento fuera de límites en drivers/ufs/host/ufs-exynos.c:1113:21 el exponente de desplazamiento 32 es demasiado grande para el tipo 'int' de 32 bits\n\nPara mantener la coherencia, aplique el mismo cambio a la escritura de nutmrs / UTMRL_NEXUS_TYPE."
    }
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          "product": "SIMATIC CN 4100",
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  "metrics": {
    "cvssMetricV31": [
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        "source": "[email protected]",
        "type": "Primary",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
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