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": "2026-08-29",
      "epss": "0.00177",
      "percentile": "0.0727"
    },
    "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"
    }
  }
}



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.