CVE-2026-74585

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

State: Published
Severity: Not scored
Published: Aug 22, 2026
Updated: Aug 22, 2026
Reserved: Aug 15, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before 6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72cAffected cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before 3d3c212b70633332ab71672aa2bc6af257d2ec83Affected cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before b98e1e28bd95b0fa33164eec1e763d26c7058b39Affected cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before 50f0c8dd8c3390f851cfb97ca13116f9ee6469d1Affected cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before f28066057134aa9294caa597b670daf505ad9dceAffected cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before 40d2ffb74094cf36edbe05855566a4c58b6ce808Affected cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before f32c3a9a77cfb50934a60b05d5407649af062535Affected cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before d6764992f17b23d91ff93ce905ab53c2aa7191f0Affected
LinuxLinux	3.17Affected before 3.17Not affected 5.10.265 through 5.10.Not affected 5.15.216 through 5.15.Not affected 6.1.183 through 6.1.Not affected 6.6.152 through 6.6.Not affected 6.12.104 through 6.12.Not affected 6.18.45 through 6.18.Not affected 7.1.9 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before 6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72cAffected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before 3d3c212b70633332ab71672aa2bc6af257d2ec83Affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before b98e1e28bd95b0fa33164eec1e763d26c7058b39Affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before 50f0c8dd8c3390f851cfb97ca13116f9ee6469d1Affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before f28066057134aa9294caa597b670daf505ad9dceAffected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before 40d2ffb74094cf36edbe05855566a4c58b6ce808Affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before f32c3a9a77cfb50934a60b05d5407649af062535Affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 to before d6764992f17b23d91ff93ce905ab53c2aa7191f0Affected

LinuxLinux

3.17Affected
before 3.17Not affected
5.10.265 through 5.10.*Not affected
5.15.216 through 5.15.*Not affected
6.1.183 through 6.1.*Not affected
6.6.152 through 6.6.*Not affected
6.12.104 through 6.12.*Not affected
6.18.45 through 6.18.*Not affected
7.1.9 through 7.1.*Not affected
7.2 and laterNot affected

References

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