CVE-2026-64087

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

hwmon: (pmbus/adm1266) reject implausible blackbox record_count

adm1266nvmemreadblackbox() loops over a recordcount that comes straight from byte 3 of the BLACKBOXINFO response. The destination buffer is data->devmem, sized for the nvmem cell's declared 2048 bytes (ADM1266BLACKBOXMAXRECORDS * ADM1266BLACKBOXSIZE = 32 * 64). A device that reports a recordcount greater than 32 -- whether due to firmware bugs, bus corruption, or a non-responsive slave returning 0xff -- would walk readbuff past the end of the devmem allocation on the trailing iterations.

Cap recordcount at ADM1266BLACKBOXMAXRECORDS (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.