---
id: CVE-2025-40311
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  accel/habanalabs: support mapping cb with vmalloc-backed coherent memory

  When IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return
  addresses from the vmallo…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  accel/habanalabs: support mapping cb with vmalloc-backed coherent memory

  When IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return
  addresses from the vmallo…
severity: none
published: '2025-12-08'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40311'
references:
  - url: 'https://git.kernel.org/stable/c/513024d5a0e34fd34247043f1876b6138ca52847'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/73c7c2cdb442fc4160d2a2a4bfffbd162af06cb9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7ec8ac9f73d4a9438c2186768d6de27ace37531e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d1dfe21a332d38a6a09658ec29a55940afb5fe36'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00186
epssPercentile: 0.07629
ingestedAt: '2026-10-14T23:00:02.021Z'
---

## Overview

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

accel/habanalabs: support mapping cb with vmalloc-backed coherent memory

When IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return
addresses from the vmalloc range. If such an address is mapped without
VM_MIXEDMAP, vm_insert_page() will trigger a BUG_ON due to the
VM_PFNMAP restriction.

Fix this by checking for vmalloc addresses and setting VM_MIXEDMAP
in the VMA before mapping. This ensures safe mapping and avoids kernel
crashes. The memory is still driver-allocated and cannot be accessed
directly by userspace.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.