GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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
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.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/thunderbolt/eeprom.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c",
              "status": "affected",
              "version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6",
              "versionType": "git"
            },
            {
              "lessThan": "3d3c212b70633332ab71672aa2bc6af257d2ec83",
              "status": "affected",
              "version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6",
              "versionType": "git"
            },
            {
              "lessThan": "b98e1e28bd95b0fa33164eec1e763d26c7058b39",
              "status": "affected",
              "version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6",
              "versionType": "git"
            },
            {
              "lessThan": "50f0c8dd8c3390f851cfb97ca13116f9ee6469d1",
              "status": "affected",
              "version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6",
              "versionType": "git"
            },
            {
              "lessThan": "f28066057134aa9294caa597b670daf505ad9dce",
              "status": "affected",
              "version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6",
              "versionType": "git"
            },
            {
              "lessThan": "40d2ffb74094cf36edbe05855566a4c58b6ce808",
              "status": "affected",
              "version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6",
              "versionType": "git"
            },
            {
              "lessThan": "f32c3a9a77cfb50934a60b05d5407649af062535",
              "status": "affected",
              "version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6",
              "versionType": "git"
            },
            {
              "lessThan": "d6764992f17b23d91ff93ce905ab53c2aa7191f0",
              "status": "affected",
              "version": "cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/thunderbolt/eeprom.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.17"
            },
            {
              "lessThan": "3.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": [
        {
          "url": "https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83"
        },
        {
          "url": "https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39"
        },
        {
          "url": "https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce"
        },
        {
          "url": "https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808"
        },
        {
          "url": "https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0"
        }
      ],
      "title": "thunderbolt: Bound the DROM dual link port number before indexing sw-\u003eports",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74585",
      "date": "2026-09-16",
      "epss": "0.00177",
      "percentile": "0.07465"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:49:15.000Z",
      "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"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74585\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:30.560\",\"lastModified\":\"2026-08-22T16:16:30.560\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/thunderbolt/eeprom.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/thunderbolt/eeprom.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-02T01:04:23Z",
      "cve": "CVE-2026-74585",
      "id": "CVE-2026-74585",
      "initial_release_date": "2026-08-23T00:06:30Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "92",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74585",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74585.json",
      "version": "4"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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.