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CVE-2024-46852

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: dma-buf: heaps: Fix off-by-one in CMA heap fault handler Until VM_DONTEXPAND was added in commit 1c1914d6e8c6 ("dma-buf: heaps: Don't track CMA dma-buf pages under RssFile") it was possible to obtain a mapping larger than the buffer size via mremap and bypass the overflow check in dma_buf_mmap_internal. When using such a mapping to attempt to fault past the end of the buffer, the CMA heap fault handler also checks the fault offset against the buffer size, but gets the boundary wrong by 1. Fix the boundary check so that we don't read off the end of the pages array and insert an arbitrary page in the mapping.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2024-09-27 13:15:16.917000
Last modified
2026-11-03 22:17:24.360000
View original CVE JSON 
{
  "id": "CVE-2024-46852",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-09-27T13:15:16.917",
  "lastModified": "2026-11-03T22:17:24.360",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf: heaps: Fix off-by-one in CMA heap fault handler\n\nUntil VM_DONTEXPAND was added in commit 1c1914d6e8c6 (\"dma-buf: heaps:\nDon't track CMA dma-buf pages under RssFile\") it was possible to obtain\na mapping larger than the buffer size via mremap and bypass the overflow\ncheck in dma_buf_mmap_internal. When using such a mapping to attempt to\nfault past the end of the buffer, the CMA heap fault handler also checks\nthe fault offset against the buffer size, but gets the boundary wrong by\n1. Fix the boundary check so that we don't read off the end of the pages\narray and insert an arbitrary page in the mapping."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dma-buf: heaps: Fix off-by-one in CMA heap fault handler Hasta que se agregó VM_DONTEXPAND en el commit 1c1914d6e8c6 (\"dma-buf: heaps: Don't track CMA dma-buf pages under RssFile\") era posible obtener un mapeo más grande que el tamaño del buffer a través de mremap y omitir la verificación de desbordamiento en dma_buf_mmap_internal. Al usar dicho mapeo para intentar fallar más allá del final del búfer, el manejador de fallas del montón de CMA también verifica el desplazamiento de la falla contra el tamaño del búfer, pero obtiene el límite incorrecto por 1. Corrija la verificación del límite para que no leamos el final de la matriz de páginas e insertemos una página arbitraria en el mapeo."
    }
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