---
id: CVE-2024-26787
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mmc: mmci: stm32: fix DMA API overlapping mappings warning

  Turning on CONFIG_DMA_API_DEBUG_SG results in the following warning:

  DMA-API: mmci-pl18x 48220000.mmc: cach…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mmc: mmci: stm32: fix DMA API overlapping mappings warning

  Turning on CONFIG_DMA_API_DEBUG_SG results in the following warning:

  DMA-API: mmci-pl18x 48220000.mmc: cach…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.20, < 5.10.213'
  - 'linux_kernel >= 5.11, < 5.15.152'
  - 'linux_kernel >= 5.16, < 6.1.81'
  - 'linux_kernel >= 6.2, < 6.6.21'
  - 'linux_kernel >= 6.7, < 6.7.9'
  - linux_kernel = 6.8
  - debian_linux = 10.0
patched:
  - linux_kernel 6.7.9
published: '2024-04-04'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:17:23.633'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-26787'
references:
  - url: 'https://git.kernel.org/stable/c/0224cbc53ba82b84affa7619b6d1b1a254bc2c53'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/176e66269f0de327375fc0ea51c12c2f5a97e4c4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5ae5060e17a3fc38e54c3e5bd8abd6b1d5bfae7c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6b1ba3f9040be5efc4396d86c9752cdc564730be'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/70af82bb9c897faa25a44e4181f36c60312b71ef'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d610a307225951929b9dff807788439454476f85'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0224cbc53ba82b84affa7619b6d1b1a254bc2c53'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/176e66269f0de327375fc0ea51c12c2f5a97e4c4'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/5ae5060e17a3fc38e54c3e5bd8abd6b1d5bfae7c'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/6b1ba3f9040be5efc4396d86c9752cdc564730be'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/70af82bb9c897faa25a44e4181f36c60312b71ef'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/d610a307225951929b9dff807788439454476f85'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00226
epssPercentile: 0.13225
ingestedAt: '2026-10-15T03:30:12.648Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-09-10T15:51:02.092511Z'
---

## Overview

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

mmc: mmci: stm32: fix DMA API overlapping mappings warning

Turning on CONFIG_DMA_API_DEBUG_SG results in the following warning:

DMA-API: mmci-pl18x 48220000.mmc: cacheline tracking EEXIST,
overlapping mappings aren't supported
WARNING: CPU: 1 PID: 51 at kernel/dma/debug.c:568
add_dma_entry+0x234/0x2f4
Modules linked in:
CPU: 1 PID: 51 Comm: kworker/1:2 Not tainted 6.1.28 #1
Hardware name: STMicroelectronics STM32MP257F-EV1 Evaluation Board (DT)
Workqueue: events_freezable mmc_rescan
Call trace:
add_dma_entry+0x234/0x2f4
debug_dma_map_sg+0x198/0x350
__dma_map_sg_attrs+0xa0/0x110
dma_map_sg_attrs+0x10/0x2c
sdmmc_idma_prep_data+0x80/0xc0
mmci_prep_data+0x38/0x84
mmci_start_data+0x108/0x2dc
mmci_request+0xe4/0x190
__mmc_start_request+0x68/0x140
mmc_start_request+0x94/0xc0
mmc_wait_for_req+0x70/0x100
mmc_send_tuning+0x108/0x1ac
sdmmc_execute_tuning+0x14c/0x210
mmc_execute_tuning+0x48/0xec
mmc_sd_init_uhs_card.part.0+0x208/0x464
mmc_sd_init_card+0x318/0x89c
mmc_attach_sd+0xe4/0x180
mmc_rescan+0x244/0x320

DMA API debug brings to light leaking dma-mappings as dma_map_sg and
dma_unmap_sg are not correctly balanced.

If an error occurs in mmci_cmd_irq function, only mmci_dma_error
function is called and as this API is not managed on stm32 variant,
dma_unmap_sg is never called in this error path.

## Affected

- `linux_kernel >= 4.20, < 5.10.213`
- `linux_kernel >= 5.11, < 5.15.152`
- `linux_kernel >= 5.16, < 6.1.81`
- `linux_kernel >= 6.2, < 6.6.21`
- `linux_kernel >= 6.7, < 6.7.9`
- `linux_kernel = 6.8`
- `debian_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.7.9`