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CVE-2025-39716

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: parisc: Revise __get_user() to probe user read access Because of the way read access support is implemented, read access interruptions are only triggered at privilege levels 2 and 3. The kernel executes at privilege level 0, so __get_user() never triggers a read access interruption (code 26). Thus, it is currently possible for user code to access a read protected address via a system call. Fix this by probing read access rights at privilege level 3 (PRIV_USER) and setting __gu_err to -EFAULT (-14) if access isn't allowed. Note the cmpiclr instruction does a 32-bit compare because COND macro doesn't work inside asm.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-05 18:15:49.123000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON 
{
  "id": "CVE-2025-39716",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-05T18:15:49.123",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Revise __get_user() to probe user read access\n\nBecause of the way read access support is implemented, read access\ninterruptions are only triggered at privilege levels 2 and 3. The\nkernel executes at privilege level 0, so __get_user() never triggers\na read access interruption (code 26). Thus, it is currently possible\nfor user code to access a read protected address via a system call.\n\nFix this by probing read access rights at privilege level 3 (PRIV_USER)\nand setting __gu_err to -EFAULT (-14) if access isn't allowed.\n\nNote the cmpiclr instruction does a 32-bit compare because COND macro\ndoesn't work inside asm."
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nparisc: Revisar __get_user() para sondear el acceso de lectura del usuario\n\nDebido a la forma en que se implementa el soporte de acceso de lectura, las interrupciones de acceso de lectura solo se activan en los niveles de privilegio 2 y 3. El kernel se ejecuta en el nivel de privilegio 0, por lo que __get_user() nunca activa una interrupción de acceso de lectura (código 26). Por lo tanto, actualmente es posible que el código de usuario acceda a una dirección protegida contra lectura a través de una llamada al sistema.\n\nSolucionar esto sondeando los derechos de acceso de lectura en el nivel de privilegio 3 (PRIV_USER) y estableciendo __gu_err en -EFAULT (-14) si el acceso no está permitido.\n\nTenga en cuenta que la instrucción cmpiclr realiza una comparación de 32 bits porque la macro COND no funciona dentro de asm."
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          "attackComplexity": "LOW",
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          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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      "source": "[email protected]",
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      "description": [
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