CVE-2025-39921

In the Linux kernel, the following vulnerability has been resolved: spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback In commit 13529647743d9 ("spi: microchip-core-qspi: Support per spi-mem operation frequency switches") the logic for checking the viability of op->max_freq in mchp_coreqspi_setup_clock() was copied into mchp_coreqspi_supports_op(). Unfortunately, op->max_freq is not valid when this function is called during probe but is instead zero. Accordingly, baud_rate_val is calculated to be INT_MAX due to division by zero, causing probe of the attached memory device to fail. Seemingly spi-microchip-core-qspi was the only driver that had such a modification made to its supports_op callback when the per_op_freq capability was added, so just remove it to restore prior functionality.

The following products are affected by CVE-2025-39921 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-39921.

URL	Resource
https://git.kernel.org/stable/c/89e7353f522f5cf70cb48c01ce2dcdcb275b8022
https://git.kernel.org/stable/c/ac8a13f35d5b8996582b3f97b924838a5c570c18
https://lore.kernel.org/linux-cve-announce/2025100120-CVE-2025-39921-820c@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-39921
https://www.cve.org/CVERecord?id=CVE-2025-39921