CVE-2026-53337

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: bonding: fix NULL pointer dereference in bond_do_ioctl()

In bond_do_ioctl(), slave_dev is obtained via __dev_get_by_name() which

can return NULL if the requested interface name does not exist. However,

the subsequent slave_dbg() call is placed before the NULL check:

slave_dev = __dev_get_by_name(net, ifr->ifr_slave);

slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); //here

if (!slave_dev)

return -ENODEV;

The slave_dbg() macro expands to netdev_dbg(bond_dev, "(slave %s): " fmt,

(slave_dev)->name, ...) which unconditionally dereferences slave_dev->name

before the NULL check is performed. This results in a NULL pointer

dereference kernel oops when a user calls bonding ioctl (e.g.

SIOCBONDENSLAVE, SIOCBONDRELEASE, etc.) with a non-existent slave

interface name.

This is reachable from userspace via the bonding ioctl interface with

CAP_NET_ADMIN capability, making it a potential loca

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References