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CVE-2025-71274

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: rpmsg: core: fix race in driver_override_show() and use core helper The driver_override_show function reads the driver_override string without holding the device_lock. However, the store function modifies and frees the string while holding the device_lock. This creates a race condition where the string can be freed by the store function while being read by the show function, leading to a use-after-free. To fix this, replace the rpmsg_string_attr macro with explicit show and store functions. The new driver_override_store uses the standard driver_set_override helper. Since the introduction of driver_set_override, the comments in include/linux/rpmsg.h have stated that this helper must be used to set or clear driver_override, but the implementation was not updated until now. Because driver_set_override modifies and frees the string while holding the device_lock, the new driver_override_show now correctly holds the device_lock during the read operation to prevent the race. Additionally, since rpmsg_string_attr has only ever been used for driver_override, removing the macro simplifies the code.

Severity
MEDIUM
CVSS score
4.7 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-06 12:16:27.447000
Last modified
2026-10-19 19:17:18.423000
View original CVE JSON 
{
  "id": "CVE-2025-71274",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-05-06T12:16:27.447",
  "lastModified": "2026-10-19T19:17:18.423",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrpmsg: core: fix race in driver_override_show() and use core helper\n\nThe driver_override_show function reads the driver_override string\nwithout holding the device_lock. However, the store function modifies\nand frees the string while holding the device_lock. This creates a race\ncondition where the string can be freed by the store function while\nbeing read by the show function, leading to a use-after-free.\n\nTo fix this, replace the rpmsg_string_attr macro with explicit show and\nstore functions. The new driver_override_store uses the standard\ndriver_set_override helper. Since the introduction of\ndriver_set_override, the comments in include/linux/rpmsg.h have stated\nthat this helper must be used to set or clear driver_override, but the\nimplementation was not updated until now.\n\nBecause driver_set_override modifies and frees the string while holding\nthe device_lock, the new driver_override_show now correctly holds the\ndevice_lock during the read operation to prevent the race.\n\nAdditionally, since rpmsg_string_attr has only ever been used for\ndriver_override, removing the macro simplifies the code."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nrpmsg: core: corregir condición de carrera en driver_override_show() y usar la función auxiliar del core\n\nLa función driver_override_show lee la cadena driver_override sin mantener el device_lock. Sin embargo, la función store modifica y libera la cadena mientras mantiene el device_lock. Esto crea una condición de carrera donde la cadena puede ser liberada por la función store mientras es leída por la función show, lo que lleva a un uso después de liberación.\n\nPara solucionar esto, reemplace la macro rpmsg_string_attr con funciones show y store explícitas. La nueva driver_override_store utiliza la función auxiliar estándar driver_set_override. Desde la introducción de driver_set_override, los comentarios en include/linux/rpmsg.h han indicado que esta función auxiliar debe ser utilizada para establecer o borrar driver_override, pero la implementación no fue actualizada hasta ahora.\n\nDebido a que driver_set_override modifica y libera la cadena mientras mantiene el device_lock, la nueva driver_override_show ahora mantiene correctamente el device_lock durante la operación de lectura para prevenir la condición de carrera.\n\nAdemás, dado que rpmsg_string_attr solo ha sido utilizada para driver_override, eliminar la macro simplifica el código."
    }
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