CVE-2025-39921

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux13529647743d906ed3cf991f1d77727e7ff1fb6f < ac8a13f35d5b8996582b3f97b924838a5c570c18affected
LinuxLinux13529647743d906ed3cf991f1d77727e7ff1fb6f < 89e7353f522f5cf70cb48c01ce2dcdcb275b8022affected
LinuxLinux6.14affected
LinuxLinux0 < 6.14unaffected
LinuxLinux6.16.6 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References