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CVE-2026-74585

Unknown

Last modified

CVE-2026-74585 is a vulnerability of currently unknown severity. 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..

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6, < 6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c; >= cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6, < 3d3c212b70633332ab71672aa2bc6af257d2ec83; >= cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6, < b98e1e28bd95b0fa33164eec1e763d26c7058b39; >= cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6, < 50f0c8dd8c3390f851cfb97ca13116f9ee6469d1; >= cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6, < f28066057134aa9294caa597b670daf505ad9dce; >= cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6, < 40d2ffb74094cf36edbe05855566a4c58b6ce808; >= cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6, < f32c3a9a77cfb50934a60b05d5407649af062535; >= cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6, < d6764992f17b23d91ff93ce905ab53c2aa7191f0
LinuxLinux3.17

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74585?
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.
How severe is CVE-2026-74585?
Severity scoring for CVE-2026-74585 is pending analysis.
How do I fix CVE-2026-74585?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST