CVE-2026-74585 (GCVE-0-2026-74585)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-22 15:31
VLAI
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6665 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 , < 6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c (git)
Affected: cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 , < 3d3c212b70633332ab71672aa2bc6af257d2ec83 (git)
Affected: cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 , < b98e1e28bd95b0fa33164eec1e763d26c7058b39 (git)
Affected: cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 , < 50f0c8dd8c3390f851cfb97ca13116f9ee6469d1 (git)
Affected: cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 , < f28066057134aa9294caa597b670daf505ad9dce (git)
Affected: cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 , < 40d2ffb74094cf36edbe05855566a4c58b6ce808 (git)
Affected: cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 , < f32c3a9a77cfb50934a60b05d5407649af062535 (git)
Affected: cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 , < d6764992f17b23d91ff93ce905ab53c2aa7191f0 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Bound the DROM dual link port number before indexing sw-\u003eports\n\ntb_drom_parse_entry_port() validates the device-supplied header-\u003eindex\nagainst sw-\u003econfig.max_port_number before indexing sw-\u003eports[], but the\nsibling field entry-\u003edual_link_port_nr -- a 6-bit value also read from\nthe DROM -- indexes the same array with no such check. A malicious or\nmalformed Thunderbolt device can set dual_link_port_nr beyond the\nallocated sw-\u003eports[] (max_port_number + 1 entries), producing an\nout-of-bounds tb_port pointer that is stored and later dereferenced.\n\nReject a port entry whose dual_link_port_nr exceeds max_port_number,\nthe same bound already applied to header-\u003eindex."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:31:38.339Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83"
        },
        {
          "url": "https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39"
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        {
          "url": "https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1"
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        },
        {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74585",
    "datePublished": "2026-08-22T15:31:38.339Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-22T15:31:38.339Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "date": "2026-10-14",
      "epss": "0.00177",
      "percentile": "0.06734"
    },
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      "cve": "CVE-2026-74585",
      "id": "msrc_CVE-2026-74585",
      "initial_release_date": "2026-08-24T01:06:11.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "thunderbolt: Bound the DROM dual link port number before indexing sw-\u003eports",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74585.json",
      "version": "2"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Bound the DROM dual link port number before indexing sw-\u003eports\n\ntb_drom_parse_entry_port() validates the device-supplied header-\u003eindex\nagainst sw-\u003econfig.max_port_number before indexing sw-\u003eports[], but the\nsibling field entry-\u003edual_link_port_nr -- a 6-bit value also read from\nthe DROM -- indexes the same array with no such check. A malicious or\nmalformed Thunderbolt device can set dual_link_port_nr beyond the\nallocated sw-\u003eports[] (max_port_number + 1 entries), producing an\nout-of-bounds tb_port pointer that is stored and later dereferenced.\n\nReject a port entry whose dual_link_port_nr exceeds max_port_number,\nthe same bound already applied to header-\u003eindex."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nthunderbolt: Limitar el n\u00famero de puerto de enlace dual DROM antes de indexar sw -\u003e ports\n\ntb_drom_parse_entry_port() valida el header -\u003e index proporcionado por el dispositivo contra sw -\u003e config.max_port_number antes de indexar sw -\u003e ports[], pero el campo hermano entry -\u003e dual_link_port_nr -- un valor de 6 bits tambi\u00e9n le\u00eddo del DROM -- indexa el mismo array sin dicha comprobaci\u00f3n. Un dispositivo Thunderbolt malicioso o malformado puede establecer dual_link_port_nr m\u00e1s all\u00e1 del sw -\u003e ports[] asignado (max_port_number + 1 entradas), produciendo un puntero tb_port fuera de l\u00edmites que se almacena y luego se desreferencia.\n\nRechazar una entrada de puerto cuyo dual_link_port_nr excede max_port_number, el mismo l\u00edmite ya aplicado a header -\u003e index."
          }
        ],
        "id": "CVE-2026-74585",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2026-08-22T16:16:30.560",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "url": "https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1"
          },
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          },
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            "url": "https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T11:53:49+00:00",
      "cve": "CVE-2026-74585",
      "id": "CVE-2026-74585",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: thunderbolt: Bound the DROM dual link port number before indexing sw-\u003eports",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74585.json",
      "version": "3"
    }
  }
}



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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.