CVE-2026-64228

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: ethtool: phy: avoid NULL deref when PHY driver is unbound<br /> <br /> phydev-&gt;drv can become NULL while the phy_device is still attached to<br /> its net_device, namely after the PHY driver is unbound via sysfs:<br /> <br /> echo &gt; /sys/bus/mdio_bus/drivers//unbind<br /> <br /> phy_remove() clears phydev-&gt;drv but doesn&amp;#39;t call phy_detach(), so the<br /> phy_device stays in the link topology xarray and ethnl_req_get_phydev()<br /> still hands it back. ETHTOOL_MSG_PHY_GET then oopses on:<br /> <br /> rep_data-&gt;drvname = kstrdup(phydev-&gt;drv-&gt;name, GFP_KERNEL);<br /> <br /> drvname is already treated as optional by phy_reply_size(),<br /> phy_fill_reply() and phy_cleanup_data(), so just skip the allocation<br /> when there is no driver bound.