CVE-2026-64087

Description

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.

References

• https://git.kernel.org/stable/c/0e791cd0140fb136083565aadfbe0f705aa260d0
• https://git.kernel.org/stable/c/231db52a5b64d0a9769e298dadc148e1f79b26a6
• https://git.kernel.org/stable/c/4afca954622d672ea65ed961bed01cf91caa034e
• https://git.kernel.org/stable/c/5469e1e7c411acc15fdd8262c99c3ebd9defd594
• https://git.kernel.org/stable/c/75c862adf3d3caab4f49bb3530723c215376e37c