CVE-2026-74585

/// Technical description

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

thunderbolt: Bound the DROM dual link port number before indexing sw->ports

tb_drom_parse_entry_port() validates the device-supplied header->index

against sw->config.max_port_number before indexing sw->ports[], but the

sibling field entry->dual_link_port_nr -- a 6-bit value also read from

the DROM -- indexes the same array with no such check. A malicious or

malformed Thunderbolt device can set dual_link_port_nr beyond the

allocated sw->ports[] (max_port_number + 1 entries), producing an

out-of-bounds tb_port pointer that is stored and later dereferenced.

Reject a port entry whose dual_link_port_nr exceeds max_port_number,

the same bound already applied to header->index.

/// 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