{"cve":"CVE-2026-97502","nvd":{"published":"2026-09-24T17:17:27.963","modified":"2026-10-03T11:17:59.840","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: davinci: avoid NULL deref of host->data in IRQ handler\n\nmmc_davinci_irq() returns early only when both host->cmd and\nhost->data are NULL:\n\n  if (host->cmd == NULL && host->data == NULL) {\n          ...\n          return IRQ_NONE;\n  }\n\nSo we may legitimately reach the rest of the handler with\nhost->data == NULL (and therefore data == NULL). The DATDNE branch\nalready guards against this with an explicit \"if (data != NULL)\"\ncheck, but the subsequent TOUTRD (\"read data timeout\") and\nCRCWR/CRCRD (\"data CRC error\") branches dereference data\nunconditionally:\n\n  if (qstatus & MMCST0_TOUTRD) {\n          data->error = -ETIMEDOUT;        <-- NULL deref\n          ...\n          davinci_abort_data(host, data);\n  }\n\n  if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) {\n          data->error = -EILSEQ;           <-- NULL deref\n          ...\n  }\n\nIf either bit is set in qstatus while host->data is NULL, the kernel\nwill crash inside the IRQ handler. smatch flags this:\n\n  drivers/mmc/host/davinci_mmc.c:933 mmc_davinci_irq() error: we\n    previously assumed 'data' could be null (see line 914)\n\nGate both branches on a non-NULL data, matching the existing pattern\nused by the DATDNE branch.\n\nNo functional change for callers where data is non-NULL, which is\nthe only case in which these branches did meaningful work before\nthis change.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/3c5e3e5badbf0592332887d12db02458323682c3","https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34","https://git.kernel.org/stable/c/51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96","https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577","https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-97502","score":0.00161,"percentile":0.05225,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}