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CVE-2025-38722

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: habanalabs: fix UAF in export_dmabuf() As soon as we'd inserted a file reference into descriptor table, another thread could close it. That's fine for the case when all we are doing is returning that descriptor to userland (it's a race, but it's a userland race and there's nothing the kernel can do about it). However, if we follow fd_install() with any kind of access to objects that would be destroyed on close (be it the struct file itself or anything destroyed by its ->release()), we have a UAF. dma_buf_fd() is a combination of reserving a descriptor and fd_install(). habanalabs export_dmabuf() calls it and then proceeds to access the objects destroyed on close. In particular, it grabs an extra reference to another struct file that will be dropped as part of ->release() for ours; that "will be" is actually "might have already been". Fix that by reserving descriptor before anything else and do fd_install() only when everything had been set up. As a side benefit, we no longer have the failure exit with file already created, but reference to underlying file (as well as ->dmabuf_export_cnt, etc.) not grabbed yet; unlike dma_buf_fd(), fd_install() can't fail.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-04 16:15:41.993000
Last modified
2026-10-30 13:18:07.790000
View original CVE JSON 
{
  "id": "CVE-2025-38722",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-04T16:15:41.993",
  "lastModified": "2026-10-30T13:18:07.790",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhabanalabs: fix UAF in export_dmabuf()\n\nAs soon as we'd inserted a file reference into descriptor table, another\nthread could close it.  That's fine for the case when all we are doing is\nreturning that descriptor to userland (it's a race, but it's a userland\nrace and there's nothing the kernel can do about it).  However, if we\nfollow fd_install() with any kind of access to objects that would be\ndestroyed on close (be it the struct file itself or anything destroyed\nby its ->release()), we have a UAF.\n\ndma_buf_fd() is a combination of reserving a descriptor and fd_install().\nhabanalabs export_dmabuf() calls it and then proceeds to access the\nobjects destroyed on close.  In particular, it grabs an extra reference to\nanother struct file that will be dropped as part of ->release() for ours;\nthat \"will be\" is actually \"might have already been\".\n\nFix that by reserving descriptor before anything else and do fd_install()\nonly when everything had been set up.  As a side benefit, we no longer\nhave the failure exit with file already created, but reference to\nunderlying file (as well as ->dmabuf_export_cnt, etc.) not grabbed yet;\nunlike dma_buf_fd(), fd_install() can't fail."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nhabanalabs: corrige UAF en export_dmabuf()\n\nTan pronto como hubiéramos insertado una referencia de archivo en la tabla de descriptores, otro hilo podría cerrarla. Eso está bien para el caso en que todo lo que estamos haciendo es devolver ese descriptor al espacio de usuario (es una condición de carrera, pero es una condición de carrera del espacio de usuario y no hay nada que el kernel pueda hacer al respecto). Sin embargo, si después de fd_install() seguimos con cualquier tipo de acceso a objetos que serían destruidos al cerrar (ya sea la propia struct file o cualquier cosa destruida por su ->release()), tenemos un UAF.\n\ndma_buf_fd() es una combinación de reservar un descriptor y fd_install(). habanalabs export_dmabuf() lo llama y luego procede a acceder a los objetos destruidos al cerrar. En particular, toma una referencia adicional a otra struct file que será liberada como parte de ->release() para la nuestra; ese 'será' es en realidad 'podría haber sido ya'.\n\nCorregir eso reservando el descriptor antes que nada y haciendo fd_install() solo cuando todo hubiera sido configurado. Como beneficio adicional, ya no tenemos la salida por fallo con el archivo ya creado, pero la referencia al archivo subyacente (así como ->dmabuf_export_cnt, etc.) aún no tomada; a diferencia de dma_buf_fd(), fd_install() no puede fallar."
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