CVE-2025-68773

/// Technical description

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

spi: fsl-cpm: Check length parity before switching to 16 bit mode

Commit fc96ec826bce ("spi: fsl-cpm: Use 16 bit mode for large transfers

with even size") failed to make sure that the size is really even

before switching to 16 bit mode. Until recently the problem went

unnoticed because kernfs uses a pre-allocated bounce buffer of size

PAGE_SIZE for reading EEPROM.

But commit 8ad6249c51d0 ("eeprom: at25: convert to spi-mem API")

introduced an additional dynamically allocated bounce buffer whose size

is exactly the size of the transfer, leading to a buffer overrun in

the fsl-cpm driver when that size is odd.

Add the missing length parity verification and remain in 8 bit mode

when the length is not even.

/// 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