CVE-2026-53337

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: bonding: fix NULL pointer dereference in bond_do_ioctl()<br /> <br /> In bond_do_ioctl(), slave_dev is obtained via __dev_get_by_name() which<br /> can return NULL if the requested interface name does not exist. However,<br /> the subsequent slave_dbg() call is placed before the NULL check:<br /> <br /> slave_dev = __dev_get_by_name(net, ifr-&gt;ifr_slave);<br /> slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); //here<br /> if (!slave_dev)<br /> return -ENODEV;<br /> <br /> The slave_dbg() macro expands to netdev_dbg(bond_dev, "(slave %s): " fmt,<br /> (slave_dev)-&gt;name, ...) which unconditionally dereferences slave_dev-&gt;name<br /> before the NULL check is performed. This results in a NULL pointer<br /> dereference kernel oops when a user calls bonding ioctl (e.g.<br /> SIOCBONDENSLAVE, SIOCBONDRELEASE, etc.) with a non-existent slave<br /> interface name.<br /> <br /> This is reachable from userspace via the bonding ioctl interface with<br /> CAP_NET_ADMIN capability, making it a potential local denial-of-service<br /> vector.<br /> <br /> Fix by moving the slave_dbg() call after the NULL check.