What’s Vulnerable › Vulnerabilities

CVE-2026-74585: thunderbolt: Bound the DROM dual link port number before indexing sw->ports

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-22 · updated 2026-10-14

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 products

• Linux kernel: 3.17 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

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

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