CVE-2026-63985

Description

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 (fallback_set_params()) validates that offset < eeprom_len, but does not check that offset + length stays within eeprom_len. The ioctl equivalent (ethtool_get_any_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 fallback_set_params(), mirroring the ioctl. Similarly - ethtool core in general, and ethtool_get_any_eeprom() in particular tries to zero-init all buffers passed to the drivers to avoid any extra work of zeroing things out. eeprom_fallback() uses a plain kmalloc(), change it to zalloc.

References

• https://git.kernel.org/stable/c/0e182689831277faf2ef683573a60474c208f690
• https://git.kernel.org/stable/c/4fe1bc4b3603f621240d5b401742f302190db769
• https://git.kernel.org/stable/c/65674d2489a12b8efd2ca0effb3de1d12224b596
• https://git.kernel.org/stable/c/67cfdd9210b99f260b3e0afeb9525e0acc7be31e
• https://git.kernel.org/stable/c/6ed7ebe22e9c3e3e946b6973c1ce43d3c38aeac1