{"id":"CVE-2026-72134","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-72134","generatedAt":"2026-10-28T10:36:07.455Z","title":"In the Linux kernel, the following vulnerability has been resolved: spi: imx: reconfigure for PIO when DMA cannot be started When spi_imx_can_dma() selects DMA, the ECSPI is configured for DMA: spi_imx_setupxfer() sets CTRL.SMC and clears dynamic_burst,…","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nspi: imx: reconfigure for PIO when DMA cannot be started\n\nWhen spi_imx_can_dma() selects DMA, the ECSPI is configured for DMA:\nspi_imx_setupxfer() sets CTRL.SMC and clears dynamic_burst, and\nspi_imx_dma_transfer() programs the dynamic-burst BURST_LENGTH and the\nSDMA watermarks.\n\nIf the DMA descriptor cannot be prepared (dmaengine_prep_slave_single()\nreturns NULL), the transfer is failed with SPI_TRANS_FAIL_NO_START and\nfalls back to PIO. The dynamic-burst DMA path uses its own bounce\nbuffers instead of the SPI core's mapping, so xfer->{tx,rx}_sg_mapped\nare not set and the core's DMA->PIO retry is skipped; the driver falls\nback to PIO internally. But none of the DMA-mode configuration is\nundone, so the PIO transfer runs with CTRL.SMC set, the wrong burst\nlength and dynamic_burst cleared, and the transferred data is corrupted.\n\nThis is easily hit on i.MX8MP boards that describe ECSPI DMA in the\ndevice tree but run SDMA on ROM firmware (no external sdma-imx7d.bin):\nevery ECSPI DMA prepare fails. An Infineon SLB9670 TPM on ECSPI1 then\nreturns shifted TPM2_GetCapability data, is flagged \"field failure\nmode\", /dev/tpmrm0 is never created.\n\nSet controller->fallback before re-running spi_imx_setupxfer() so the\nECSPI is reconfigured exactly like a normal PIO transfer. With\ncontroller->fallback set, spi_imx_setupxfer() sees spi_imx_can_dma()\nreturn false, so it clears spi_imx->usedma and reprograms the controller\n(clears CTRL.SMC, restores dynamic_burst and the PIO burst length). No\nexplicit spi_imx->usedma = false is needed: setupxfer() already updates\nit from the can_dma() result.","published":"2026-08-15T06:21:31.000Z","lastModified":"2026-08-17T06:18:13.000Z","status":"Received","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":[],"affected":[],"epss":{"score":0.00165,"percentile":0.05668,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/245404c26563aafb36aafb01298f148db1851be3","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/40dee2d3e9994aed9efe7bed40eb0e4d38d5a25c","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72134","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}