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CVE Record

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

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel driver flaw affecting the STM32 MMC/SD controller path. On certain error paths, DMA mappings are not properly released, which can trigger DMA API debug warnings and resource leakage. The sources do not provide a CVSS score, confirmed exploitation, or business-impact detail.

Executive priority

Treat this as a targeted embedded Linux maintenance issue unless your environment relies on STM32-based systems. There is insufficient source evidence to justify emergency response, but affected operational technology or appliance fleets should receive normal vendor patching attention.

Technical view

The issue is in the Linux mmc mmci stm32 driver. dma_map_sg and dma_unmap_sg are unbalanced when mmci_cmd_irq hits an error and the STM32 variant does not perform the unmap path. CONFIG_DMA_API_DEBUG_SG exposes overlapping mapping warnings on STM32MP257F-EV1 hardware.

Likely exposure

Exposure is most likely in Linux-based embedded or industrial systems using STM32 MMC/SD controller support. The bundle lists Linux kernel versions as affected and includes Debian LTS and Siemens advisories, but does not identify specific deployed products beyond those references.

Exploitation context

The CVE is not listed as CISA KEV, and the provided sources do not claim active exploitation or public exploit availability. Evidence points to a driver error-handling bug observed through kernel DMA debug instrumentation, not a documented remote attack path.

Researcher notes

The key evidence is the unbalanced DMA mapping/unmapping path in the STM32 mmci driver. The source bundle lacks CVSS, CWE, exploitability analysis, and product-specific impact detail, so exposure assessment depends heavily on kernel configuration, board hardware, and vendor backports.

Mitigation direction

  • Upgrade to a Linux kernel or vendor package containing the referenced stable fixes.
  • Follow Debian, Siemens, or device-vendor guidance for affected deployed systems.
  • Prioritize embedded systems using STM32 MMC/SD hardware paths.
  • Track vendor advisories where kernel versions are customized or backported.

Validation and detection

  • Inventory Linux kernel versions on STM32-based devices and appliances.
  • Check vendor advisories for whether the fix is backported to your build.
  • Confirm the relevant stable fix commit exists in the running kernel source package.
  • Review kernel logs for DMA-API overlapping mapping warnings where debug is enabled.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2024-26787 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
3ADP providers
9Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux46b723dd867d599420fb640c0eaf2a866ef721d4, 46b723dd867d599420fb640c0eaf2a866ef721d4, 46b723dd867d599420fb640c0eaf2a866ef721d4, 46b723dd867d599420fb640c0eaf2a866ef721d4, 46b723dd867d599420fb640c0eaf2a866ef721d4, 46b723dd867d599420fb640c0eaf2a866ef721d4unaffected
LinuxLinux4.20, 0, 5.10.213, 5.15.152, 6.1.81, 6.6.21, 6.7.9, 6.8affected
Weakness

CWE details

No CWE listed

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