CVE-2026-64271 (GCVE-0-2026-64271)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-11-06 16:34
VLAI
Title
Input: touchwin - reset the packet index on every complete packet
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: touchwin - reset the packet index on every complete packet tw_interrupt() accumulates each non-zero serial byte into a fixed three-byte buffer with a running index that is only reset once a full packet has been received *and* the device's two Y bytes agree: tw->data[tw->idx++] = data; if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) { ... tw->idx = 0; } The reset is gated on tw->data[1] == tw->data[2], a value the device controls. A malicious, malfunctioning or counterfeit Touchwindow peripheral can stream non-zero bytes whose 2nd and 3rd bytes differ: the index reaches TW_LENGTH without the equality holding, is never reset, and keeps growing, so tw->data[tw->idx++] walks off the end of the three-byte array and the rest of the heap-allocated struct tw, one attacker-chosen byte at a time -- an unbounded, device-driven heap out-of-bounds write. Reset the index on every completed packet and report an event only when the two Y bytes match, like the other serio touchscreen drivers do.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:33 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 11ea3173d5f2de71d037ef58ac43395795fed2bc , < ed9b66905407eb3d02df1aaeed82eb7a7f0eb508 (git)
Affected: 11ea3173d5f2de71d037ef58ac43395795fed2bc , < 044167cba2384bcd783547ad5e30ecd292b30919 (git)
Affected: 11ea3173d5f2de71d037ef58ac43395795fed2bc , < 6c9f29f128dd4057404838259af4c645318487e1 (git)
Affected: 11ea3173d5f2de71d037ef58ac43395795fed2bc , < 431ad239f2924dff337c3fccb9246597c1b63185 (git)
Affected: 11ea3173d5f2de71d037ef58ac43395795fed2bc , < 70e4248793762df9832fd4fc2fc6ac7924572c36 (git)
Affected: 11ea3173d5f2de71d037ef58ac43395795fed2bc , < 3e6f007b43e2fc6546e21fa74ee62c38984a6672 (git)
Affected: 11ea3173d5f2de71d037ef58ac43395795fed2bc , < a8d87184576c889759e3aab899799a482f1e1a5b (git)
Affected: 11ea3173d5f2de71d037ef58ac43395795fed2bc , < 478cdd736f2ce3114f90e775d7358136d3977b94 (git)
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Linux Linux Affected: 2.6.19
Unaffected: 0 , < 2.6.19 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          {
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nEntrada: touchwin - restablecer el \u00edndice del paquete en cada paquete completo\n\ntw_interrupt() acumula cada byte serie no nulo en un b\u00fafer fijo de tres bytes con un \u00edndice en ejecuci\u00f3n que solo se restablece una vez que se ha recibido un paquete completo y los dos bytes Y del dispositivo coinciden:\n\n\ttw  -\u003e  data[tw  -\u003e  idx++] = data;\n\tif (tw  -\u003e  idx == TW_LENGTH \u0026\u0026 tw  -\u003e  data[1] == tw  -\u003e  data[2]) {\n\t\t...\n\t\ttw  -\u003e  idx = 0;\n\t}\n\nEl restablecimiento est\u00e1 condicionado a tw  -\u003e  data[1] == tw  -\u003e  data[2], un valor que el dispositivo controla. Un perif\u00e9rico Touchwindow malicioso, defectuoso o falsificado puede transmitir bytes no nulos cuyos 2\u00ba y 3\u00ba bytes difieren: el \u00edndice alcanza TW_LENGTH sin que se cumpla la igualdad, nunca se restablece y sigue creciendo, por lo que tw  -\u003e  data[tw  -\u003e  idx++] se sale del final del array de tres bytes y del resto de la estructura tw asignada en el heap, un byte elegido por el atacante a la vez -- una escritura fuera de l\u00edmites en el heap, ilimitada y controlada por el dispositivo.\n\nRestablecer el \u00edndice en cada paquete completado y reportar un evento solo cuando los dos bytes Y coinciden, como lo hacen los otros controladores de pantalla t\u00e1ctil serio."
          }
        ],
        "id": "CVE-2026-64271",
        "lastModified": "2026-11-06T17:18:44.697",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
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                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-06T16:33:29.534544Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-07-25T10:17:07.410",
        "references": [
          {
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            "tags": [
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            "url": "https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "url": "https://git.kernel.org/stable/c/6c9f29f128dd4057404838259af4c645318487e1"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "url": "https://git.kernel.org/stable/c/70e4248793762df9832fd4fc2fc6ac7924572c36"
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          {
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          {
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-129"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-11-04T22:54:40+00:00",
      "cve": "CVE-2026-64271",
      "id": "CVE-2026-64271",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: touchwin - reset the packet index on every complete packet",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64271.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-64271",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-11-06T16:33:29.534544Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-11-06T16:33:30.874Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/input/touchscreen/touchwin.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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            },
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              "product": "Linux",
              "programFiles": [
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              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "2.6.19"
                },
                {
                  "lessThan": "2.6.19",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
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                  "versionType": "semver"
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                },
                {
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                },
                {
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                {
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                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.1.*",
                  "status": "unaffected",
                  "version": "7.1.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
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              "nodes": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "negate": false,
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          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: touchwin - reset the packet index on every complete packet\n\ntw_interrupt() accumulates each non-zero serial byte into a fixed\nthree-byte buffer with a running index that is only reset once a full\npacket has been received *and* the device\u0027s two Y bytes agree:\n\n\ttw-\u003edata[tw-\u003eidx++] = data;\n\tif (tw-\u003eidx == TW_LENGTH \u0026\u0026 tw-\u003edata[1] == tw-\u003edata[2]) {\n\t\t...\n\t\ttw-\u003eidx = 0;\n\t}\n\nThe reset is gated on tw-\u003edata[1] == tw-\u003edata[2], a value the device\ncontrols.  A malicious, malfunctioning or counterfeit Touchwindow\nperipheral can stream non-zero bytes whose 2nd and 3rd bytes differ: the\nindex reaches TW_LENGTH without the equality holding, is never reset, and\nkeeps growing, so tw-\u003edata[tw-\u003eidx++] walks off the end of the three-byte\narray and the rest of the heap-allocated struct tw, one attacker-chosen\nbyte at a time -- an unbounded, device-driven heap out-of-bounds write.\n\nReset the index on every completed packet and report an event only when\nthe two Y bytes match, like the other serio touchscreen drivers do."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-17T04:52:25.592Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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            },
            {
              "url": "https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94"
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          ],
          "title": "Input: touchwin - reset the packet index on every complete packet",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64271",
        "datePublished": "2026-07-25T08:49:18.160Z",
        "dateReserved": "2026-07-19T15:36:31.775Z",
        "dateUpdated": "2026-11-06T16:34:31.989Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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