CVE-2026-63985

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux96d971e307cc0e434f96329b42bbd98cfbca07d2 < 0e182689831277faf2ef683573a60474c208f690affected
LinuxLinux96d971e307cc0e434f96329b42bbd98cfbca07d2 < 6ed7ebe22e9c3e3e946b6973c1ce43d3c38aeac1affected
LinuxLinux96d971e307cc0e434f96329b42bbd98cfbca07d2 < 65674d2489a12b8efd2ca0effb3de1d12224b596affected
LinuxLinux96d971e307cc0e434f96329b42bbd98cfbca07d2 < d81376053a00865c70b8d8506a1cb93f2943d413affected
LinuxLinux96d971e307cc0e434f96329b42bbd98cfbca07d2 < fd0de51c54fa8474a0ddeedd71c65ad09fada390affected
LinuxLinux96d971e307cc0e434f96329b42bbd98cfbca07d2 < 4fe1bc4b3603f621240d5b401742f302190db769affected
LinuxLinux96d971e307cc0e434f96329b42bbd98cfbca07d2 < 67cfdd9210b99f260b3e0afeb9525e0acc7be31eaffected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References