Vulnerability-Lookup

FKIE_CVE-2026-31729

Vulnerability from fkie_nvd - Published: 2026-05-01 15:16 - Updated: 2026-05-07 16:02

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: validate connector number in ucsi_notify_common() The connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a 7-bit field (0-127) that is used to index into the connector array in ucsi_connector_change(). However, the array is only allocated for the number of connectors reported by the device (typically 2-4 entries). A malicious or malfunctioning device could report an out-of-range connector number in the CCI, causing an out-of-bounds array access in ucsi_connector_change(). Add a bounds check in ucsi_notify_common(), the central point where CCI is parsed after arriving from hardware, so that bogus connector numbers are rejected before they propagate further.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/98429e9ec89a5e3a204112dfaa2dbe6ca28493a0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d2d8c17ac01a1b1f638ea5d340a884ccc5015186	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f4e608fe12b7ac6a4a57176ab0296bb5a110a078	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f6dcbf2b024d55549959402f1db6c614e51d52cb	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: validate connector number in ucsi_notify_common()\n\nThe connector number extracted from CCI via UCSI_CCI_CONNECTOR() is a\n7-bit field (0-127) that is used to index into the connector array in\nucsi_connector_change(). However, the array is only allocated for the\nnumber of connectors reported by the device (typically 2-4 entries).\n\nA malicious or malfunctioning device could report an out-of-range\nconnector number in the CCI, causing an out-of-bounds array access in\nucsi_connector_change().\n\nAdd a bounds check in ucsi_notify_common(), the central point where CCI\nis parsed after arriving from hardware, so that bogus connector numbers\nare rejected before they propagate further."
    }
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  "id": "CVE-2026-31729",
  "lastModified": "2026-05-07T16:02:57.897",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-31729 (GCVE-0-2026-31729)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-11 22:14

Title

usb: typec: ucsi: validate connector number in ucsi_notify_common()

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/f6dcbf2b024d55549…
https://git.kernel.org/stable/c/f4e608fe12b7ac6a4…
https://git.kernel.org/stable/c/98429e9ec89a5e3a2…
https://git.kernel.org/stable/c/d2d8c17ac01a1b1f6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < f6dcbf2b024d55549959402f1db6c614e51d52cb (git) Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < f4e608fe12b7ac6a4a57176ab0296bb5a110a078 (git) Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < 98429e9ec89a5e3a204112dfaa2dbe6ca28493a0 (git) Affected: bdc62f2bae8fb0e8e99574de5232f0a3c54a27df , < d2d8c17ac01a1b1f638ea5d340a884ccc5015186 (git)
Linux	Linux	Affected: 5.5 Unaffected: 0 , < 5.5 (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/ucsi.c"
          ],
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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.

Action not permitted

FKIE_CVE-2026-31729

CVE-2026-31729 (GCVE-0-2026-31729)

Tags

Sightings

Nomenclature