CVE-2026-74585

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 < 6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72caffected
LinuxLinuxcd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 < 3d3c212b70633332ab71672aa2bc6af257d2ec83affected
LinuxLinuxcd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 < b98e1e28bd95b0fa33164eec1e763d26c7058b39affected
LinuxLinuxcd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 < 50f0c8dd8c3390f851cfb97ca13116f9ee6469d1affected
LinuxLinuxcd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 < f28066057134aa9294caa597b670daf505ad9dceaffected
LinuxLinuxcd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 < 40d2ffb74094cf36edbe05855566a4c58b6ce808affected
LinuxLinuxcd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 < f32c3a9a77cfb50934a60b05d5407649af062535affected
LinuxLinuxcd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 < d6764992f17b23d91ff93ce905ab53c2aa7191f0affected
LinuxLinux3.17affected
LinuxLinux0 < 3.17unaffected
LinuxLinux5.10.265 <= 5.10.*unaffected
LinuxLinux5.15.216 <= 5.15.*unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.152 <= 6.6.*unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References