CVE-2025-37896

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

spi: spi-mem: Add fix to avoid divide error

For some SPI flash memory operations, dummy bytes are not mandatory. For

example, in Winbond SPINAND flash memory devices, the `write_cache` and

`update_cache` operation variants have zero dummy bytes. Calculating the

duration for SPI memory operations with zero dummy bytes causes

a divide error when `ncycles` is calculated in the

spi_mem_calc_op_duration().

Add changes to skip the 'ncylcles' calculation for zero dummy bytes.

Following divide error is fixed by this change:

Oops: divide error: 0000 [#1] PREEMPT SMP NOPTI

...

? do_trap+0xdb/0x100

? do_error_trap+0x75/0xb0

? spi_mem_calc_op_duration+0x56/0xb0

? exc_divide_error+0x3b/0x70

? spi_mem_calc_op_duration+0x56/0xb0

? asm_exc_divide_error+0x1b/0x20

? spi_mem_calc_op_duration+0x56/0xb0

? spinand_select_op_variant+0xee/0x190 [spinand]

spinand_match_and_init+0x13e/0x1a0 [spinand]

spinand_manufactu

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References