Skip to content
Heist/ feed
Back to feed
UnratedFix available

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

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.265, 5.15.216, 6.1.183, 6.12.104, 6.18.45, 6.6.152, 7.1.9
CVEs
CVE-2026-74585
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 05:16 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 22 Aug 2026, 15:31 UTC

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.

osv:CVE-2026-74585

Kernel

Fixed versions: 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9

Complete source record
{
  "id": "a554bdff534e570338363332894b0ba133cfd107c597a84956c8149c3682d16a",
  "url": "https://osv.dev/vulnerability/CVE-2026-74585",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "thunderbolt: Bound the DROM dual link port number before indexing sw->ports",
    "summary": "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.",
    "evidence": "osv:CVE-2026-74585",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.265",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.216",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.183",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.152",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.104",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.45",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-74585",
      "aliases": [
        "CVE-2026-74585"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6"
                },
                {
                  "fixed": "6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c"
                },
                {
                  "fixed": "3d3c212b70633332ab71672aa2bc6af257d2ec83"
                },
                {
                  "fixed": "b98e1e28bd95b0fa33164eec1e763d26c7058b39"
                },
                {
                  "fixed": "50f0c8dd8c3390f851cfb97ca13116f9ee6469d1"
                },
                {
                  "fixed": "f28066057134aa9294caa597b670daf505ad9dce"
                },
                {
                  "fixed": "40d2ffb74094cf36edbe05855566a4c58b6ce808"
                },
                {
                  "fixed": "f32c3a9a77cfb50934a60b05d5407649af062535"
                },
                {
                  "fixed": "d6764992f17b23d91ff93ce905ab53c2aa7191f0"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74585.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.17.0"
                },
                {
                  "fixed": "5.10.265"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.216"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.183"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.152"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.104"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.45"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74585.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.256874279Z",
      "provider": "osv",
      "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",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74585.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74585",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74585.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74585",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492676,
  "published_at": "2026-08-22T15:31:38.339+00:00"
}