{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63985",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63985"
  ],
  "published": "2026-07-19T14:56:29Z",
  "summary": "ethtool: eeprom: add more safeties to EEPROM Netlink fallback",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: eeprom: add more safeties to EEPROM Netlink fallback\n\nThe Netlink fallback path for reading module EEPROM\n(fallback_set_params()) validates that offset < eeprom_len,\nbut does not check that offset + length stays within eeprom_len.\nThe ioctl equivalent (ethtool_get_any_eeprom() in ioctl.c) has\nalways enforced both bounds:\n\n  if (eeprom.offset + eeprom.len > total_len)\n      return -EINVAL;\n\nThis could lead to surprises in both drivers and device FW.\nAdd the missing offset + length validation to fallback_set_params(),\nmirroring the ioctl.\n\nSimilarly - ethtool core in general, and ethtool_get_any_eeprom()\nin particular tries to zero-init all buffers passed to the drivers\nto avoid any extra work of zeroing things out. eeprom_fallback()\nuses a plain kmalloc(), change it to zalloc.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires sending an ETHTOOL_MSG_MODULE_EEPROM_GET Netlink request to the kernel; this is a local syscall/interface path, not remote packet processing.\nAC:L - An attacker with CAP_NET_ADMIN can deterministically craft page/offset/length values after querying module info, and only needs a netdev using the legacy fallback path (common on ice/ixgbe/i40e-class drivers without get_module_eeprom_by_page).\nPR:L - The ethtool Netlink handler is registered with GENL_UNS_ADMIN_PERM, requiring CAP_NET_ADMIN in the caller's user namespace, which is obtainable via unprivileged user namespaces (e.g., unshare -Urn).\nUI:N - No victim interaction is required; the attacker triggers the malformed EEPROM read directly via Netlink.\nS:U - Impact remains within the kernel/driver/NIC security domain on the same host; this is not a VM escape or cross-authority boundary crossing.\nC:H - The fallback path used kmalloc() instead of kzalloc(), allowing uninitialized kernel heap contents to be returned to userspace, and out-of-bounds offset+length values cause legacy drivers to read and return data from beyond the declared EEPROM region (NIC/module memory).\nI:H - The fix commit explicitly warns of \"surprises in both drivers and device FW\" from out-of-bounds EEPROM access; on datacenter/cloud NICs this can drive NIC or transceiver firmware into undefined states that alter device behavior beyond the intended read-only query.\nA:H - Invalid EEPROM parameters passed to driver and device firmware can cause kernel driver errors, NIC firmware hangs/resets, or link loss on production servers with optical modules installed."
    }
  }
}