CVE-2026-63985

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

ethtool: eeprom: add more safeties to EEPROM Netlink fallback

The Netlink fallback path for reading module EEPROM (fallbacksetparams()) validates that offset < eepromlen, but does not check that offset + length stays within eepromlen. The ioctl equivalent (ethtoolgetany_eeprom() in ioctl.c) has always enforced both bounds:

if (eeprom.offset + eeprom.len > total_len) return -EINVAL;

This could lead to surprises in both drivers and device FW. Add the missing offset + length validation to fallbacksetparams(), mirroring the ioctl.

Similarly - ethtool core in general, and ethtoolgetanyeeprom() in particular tries to zero-init all buffers passed to the drivers to avoid any extra work of zeroing things out. eepromfallback() uses a plain kmalloc(), change it to zalloc.