What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-04 · updated 2026-10-15

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.

Affected products

• Debian Linux: 10.0
• Linux kernel: from 4.20 before 5.10.213; from 5.11 before 5.15.152; from 5.16 before 6.1.81; from 6.2 before 6.6.21; from 6.7 before 6.7.9; 6.8-rc1, 6.8-rc2, 6.8-rc3, 6.8-rc4, 6.8-rc5, 6.8-rc6 — fixed in 5.10.213, 5.15.152, 6.1.81, 6.6.21, 6.7.9

How to fix

Upgrade to a fixed version: Linux kernel 5.10.213, 5.15.152, 6.1.81, 6.6.21. Check the vendor advisory for mitigations.

References

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

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