CVE-2026-64087

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

hwmon: (pmbus/adm1266) reject implausible blackbox record_count

adm1266_nvmem_read_blackbox() loops over a record_count that comes

straight from byte 3 of the BLACKBOX_INFO response. The destination

buffer is data->dev_mem, sized for the nvmem cell's declared 2048

bytes (ADM1266_BLACKBOX_MAX_RECORDS * ADM1266_BLACKBOX_SIZE = 32 * 64).

A device that reports a record_count greater than 32 -- whether due

to firmware bugs, bus corruption, or a non-responsive slave returning

0xff -- would walk read_buff past the end of the dev_mem allocation

on the trailing iterations.

Cap record_count at ADM1266_BLACKBOX_MAX_RECORDS (introduced here)

before entering the loop and return -EIO on any larger value, so a

malformed BLACKBOX_INFO response cannot drive the loop out of bounds.