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CVE-2024-56712

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

udmabuf: fix memory leak on last export_udmabuf() error path

In export_udmabuf(), if dma_buf_fd() fails because the FD table is full, a dma_buf owning the udmabuf has already been created; but the error handling in udmabuf_create() will tear down the udmabuf without doing anything about the containing dma_buf.

This leaves a dma_buf in memory that contains a dangling pointer; though that doesn't seem to lead to anything bad except a memory leak.

Fix it by moving the dma_buf_fd() call out of export_udmabuf() so that we can give it different error handling.

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Note that the shape of this code changed a lot in commit 5e72b2b41a21 ("udmabuf: convert udmabuf driver to use folios"); but the memory leak seems to have existed since the introduction of udmabuf.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudmabuf: fix memory leak on last export_udmabuf() error path\n\nIn export_udmabuf(), if dma_buf_fd() fails because the FD table is full, a\ndma_buf owning the udmabuf has already been created; but the error handling\nin udmabuf_create() will tear down the udmabuf without doing anything about\nthe containing dma_buf.\n\nThis leaves a dma_buf in memory that contains a dangling pointer; though\nthat doesn't seem to lead to anything bad except a memory leak.\n\nFix it by moving the dma_buf_fd() call out of export_udmabuf() so that we\ncan give it different error handling.\n\nNote that the shape of this code changed a lot in commit 5e72b2b41a21\n(\"udmabuf: convert udmabuf driver to use folios\"); but the memory leak\nseems to have existed since the introduction of udmabuf."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: udmabuf: reparar pérdida de memoria en la última ruta de error export_udmabuf() En export_udmabuf(), si dma_buf_fd() falla porque la tabla FD está llena, ya se ha creado un dma_buf que posee el udmabuf; pero la gestión de errores en udmabuf_create() destruirá el udmabuf sin hacer nada con el dma_buf que lo contiene. Esto deja un dma_buf en la memoria que contiene un puntero colgante; aunque eso no parece conducir a nada malo excepto a una pérdida de memoria. Arréglelo moviendo la llamada dma_buf_fd() fuera de export_udmabuf() para que podamos darle un gestión de errores diferente. Tenga en cuenta que la forma de este código cambió mucho en el commit 5e72b2b41a21 (\"udmabuf: convertir el controlador udmabuf para usar folios\"); Pero la pérdida de memoria parece haber existido desde la introducción de udmabuf."
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  ],
  "lastModified": "2026-06-17T08:12:48.420",
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