{"cve":"CVE-2025-39921","nvd":{"published":"2025-10-01T08:15:35.370","modified":"2026-10-21T13:18:16.753","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nspi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback\n\nIn commit 13529647743d9 (\"spi: microchip-core-qspi: Support per spi-mem\noperation frequency switches\") the logic for checking the viability of\nop->max_freq in mchp_coreqspi_setup_clock() was copied into\nmchp_coreqspi_supports_op(). Unfortunately, op->max_freq is not valid\nwhen this function is called during probe but is instead zero.\nAccordingly, baud_rate_val is calculated to be INT_MAX due to division\nby zero, causing probe of the attached memory device to fail.\n\nSeemingly spi-microchip-core-qspi was the only driver that had such a\nmodification made to its supports_op callback when the per_op_freq\ncapability was added, so just remove it to restore prior functionality.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/4ad071e3d57967f7ab483aed0687468bc1d9e9ce","https://git.kernel.org/stable/c/89e7353f522f5cf70cb48c01ce2dcdcb275b8022","https://git.kernel.org/stable/c/ac8a13f35d5b8996582b3f97b924838a5c570c18"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2025-39921","score":0.00187,"percentile":0.08236,"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."]}