FKIE_CVE-2026-74585

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-22 16:16
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d3c212b70633332ab71672aa2bc6af257d2ec83
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/40d2ffb74094cf36edbe05855566a4c58b6ce808
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50f0c8dd8c3390f851cfb97ca13116f9ee6469d1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b98e1e28bd95b0fa33164eec1e763d26c7058b39
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6764992f17b23d91ff93ce905ab53c2aa7191f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f28066057134aa9294caa597b670daf505ad9dce
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f32c3a9a77cfb50934a60b05d5407649af062535
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "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"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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."
    }
  ],
  "id": "CVE-2026-74585",
  "lastModified": "2026-08-22T16:16:30.560",
  "metrics": {},
  "published": "2026-08-22T16:16:30.560",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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.