CVE-2026-64014 (GCVE-0-2026-64014)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:56 – Updated: 2026-07-19 14:56
VLAI
Title
Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size nexio_read_data() pulls data_len and x_len from a packed __be16 header in the device's interrupt packet and then walks packet->data[0..x_len) and packet->data[x_len..data_len) comparing each byte against a threshold. Both fields are 16-bit on the wire (max 65535). The existing adjustments shave at most 0x100 / 0x80 off, so the loop bound can still reach roughly 0xfeff. The URB transfer buffer for NEXIO is rept_size (1024) bytes from usb_alloc_coherent(), with the first 7 occupied by the packed header — so packet->data[] has 1017 valid bytes. read_data() callbacks are not given urb->actual_length, and nothing else bounds the walk. A device that lies about its length can get a ~64 KiB out-of-bounds read past the coherent DMA allocation. The first index whose byte exceeds NEXIO_THRESHOLD lands in begin_x / begin_y and from there into the reported touch coordinates, so adjacent kernel memory contents leak to userspace as ABS_X / ABS_Y events. Far enough out, the read can also hit an unmapped page and fault. Fix this all by clamping data_len to the buffer's data[] capacity and x_len to data_len.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5197424cdcccd2b0b1922babb93969b2515c43ce , < 45c829e5eb3b974282bae50b7cca2cc891f74f0b (git)
Affected: 5197424cdcccd2b0b1922babb93969b2515c43ce , < e7cdcb266ba06d8480809b78ab8bb2bf8ff51ccb (git)
Affected: 5197424cdcccd2b0b1922babb93969b2515c43ce , < 95f47331dfde243f93e679ce70bd0c24b37c683d (git)
Affected: 5197424cdcccd2b0b1922babb93969b2515c43ce , < d883312061ccde8c536595998aaf687ec070077c (git)
Affected: 5197424cdcccd2b0b1922babb93969b2515c43ce , < 103d2de9f505f56da173e43f12dba62f92620278 (git)
Affected: 5197424cdcccd2b0b1922babb93969b2515c43ce , < 0ca809ea8e0355299266c46e5f1755040aa8dcf3 (git)
Affected: 5197424cdcccd2b0b1922babb93969b2515c43ce , < 7585b6aa55d8ac85ad22f522e1059f93507727b6 (git)
Affected: 5197424cdcccd2b0b1922babb93969b2515c43ce , < 2905281cbda52ec9df540113b35b835feb5fafd3 (git)
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Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nEntrada: usbtouchscreen - limitar NEXIO data_len/x_len al tama\u00f1o del b\u00fafer URB\n\nnexio_read_data() extrae data_len y x_len de una cabecera __be16 empaquetada en el paquete de interrupci\u00f3n del dispositivo y luego recorre packet  -\u003e  data[0..x_len) y packet  -\u003e  data[x_len..data_len) comparando cada byte con un umbral.\n\nAmbos campos son de 16 bits en el cable (m\u00e1x. 65535). Los ajustes existentes recortan como m\u00e1ximo 0x100 / 0x80, por lo que el l\u00edmite del bucle a\u00fan puede alcanzar aproximadamente 0xfeff. El b\u00fafer de transferencia URB para NEXIO es de rept_size (1024) bytes de usb_alloc_coherent(), con los primeros 7 ocupados por la cabecera empaquetada - por lo que packet  -\u003e  data[] tiene 1017 bytes v\u00e1lidos. Las devoluciones de llamada de read_data() no reciben urb  -\u003e  actual_length, y nada m\u00e1s limita el recorrido.\n\nUn dispositivo que miente sobre su longitud puede obtener una lectura fuera de l\u00edmites de ~64 KiB m\u00e1s all\u00e1 de la asignaci\u00f3n DMA coherente. El primer \u00edndice cuyo byte excede NEXIO_THRESHOLD aterriza en begin_x / begin_y y de ah\u00ed a las coordenadas t\u00e1ctiles reportadas, por lo que el contenido adyacente de la memoria del kernel se filtra al espacio de usuario como eventos ABS_X / ABS_Y. Lo suficientemente lejos, la lectura tambi\u00e9n puede alcanzar una p\u00e1gina no mapeada y causar un fallo.\n\nSolucione todo esto limitando data_len a la capacidad data[] del b\u00fafer y x_len a data_len."
          }
        ],
        "id": "CVE-2026-64014",
        "lastModified": "2026-10-24T20:10:00.137",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-07-19T16:17:41.320",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0ca809ea8e0355299266c46e5f1755040aa8dcf3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/103d2de9f505f56da173e43f12dba62f92620278"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2905281cbda52ec9df540113b35b835feb5fafd3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/45c829e5eb3b974282bae50b7cca2cc891f74f0b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7585b6aa55d8ac85ad22f522e1059f93507727b6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/95f47331dfde243f93e679ce70bd0c24b37c683d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d883312061ccde8c536595998aaf687ec070077c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e7cdcb266ba06d8480809b78ab8bb2bf8ff51ccb"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T04:10:45+00:00",
      "cve": "CVE-2026-64014",
      "id": "CVE-2026-64014",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "262",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64014.json",
      "version": "3"
    }
  }
}



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