CVE-2026-74585

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.

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EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.07%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83 https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808 https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1 https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39 https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0 https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535

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 do I check if I'm vulnerable to CVE-2026-74585? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.