CVE-2026-74585
thunderbolt: Bound the DROM dual link port number before indexing sw->ports
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.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Aug. 22, 2026, 4:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the patched version.
- Verify Thunderbolt device DROM data.
- Apply necessary configuration changes.
- Reboot the system after applying updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74585.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74585 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74585
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74585 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74585 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6', 'lessThan': '6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c', 'versionType': 'git'}, {'status': 'affected', 'version': 'cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6', 'lessThan': '3d3c212b70633332ab71672aa2bc6af257d2ec83', 'versionType': 'git'}, {'status': 'affected', 'version': 'cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6', 'lessThan': 'b98e1e28bd95b0fa33164eec1e763d26c7058b39', 'versionType': 'git'}, {'status': 'affected', 'version': 'cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6', 'lessThan': '50f0c8dd8c3390f851cfb97ca13116f9ee6469d1', 'versionType': 'git'}, {'status': 'affected', 'version': 'cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6', 'lessThan': 'f28066057134aa9294caa597b670daf505ad9dce', 'versionType': 'git'}, {'status': 'affected', 'version': 'cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6', 'lessThan': '40d2ffb74094cf36edbe05855566a4c58b6ce808', 'versionType': 'git'}, {'status': 'affected', 'version': 'cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6', 'lessThan': 'f32c3a9a77cfb50934a60b05d5407649af062535', 'versionType': 'git'}, {'status': 'affected', 'version': 'cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6', 'lessThan': 'd6764992f17b23d91ff93ce905ab53c2aa7191f0', 'versionType': 'git'}], 'programFiles': ['drivers/thunderbolt/eeprom.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.265', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.216', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.183', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.152', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.104', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/thunderbolt/eeprom.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83 Added Reference https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808 Added Reference https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1 Added Reference https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c Added Reference https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39 Added Reference https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0 Added Reference https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce Added Reference https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535