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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49
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.
Assigner
References
Impacted products
Vendor Product Version
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)
Create a notification for this product.
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-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "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": [
            {
              "lessThan": "ed9b66905407eb3d02df1aaeed82eb7a7f0eb508",
              "status": "affected",
              "version": "11ea3173d5f2de71d037ef58ac43395795fed2bc",
              "versionType": "git"
            },
            {
              "lessThan": "044167cba2384bcd783547ad5e30ecd292b30919",
              "status": "affected",
              "version": "11ea3173d5f2de71d037ef58ac43395795fed2bc",
              "versionType": "git"
            },
            {
              "lessThan": "6c9f29f128dd4057404838259af4c645318487e1",
              "status": "affected",
              "version": "11ea3173d5f2de71d037ef58ac43395795fed2bc",
              "versionType": "git"
            },
            {
              "lessThan": "431ad239f2924dff337c3fccb9246597c1b63185",
              "status": "affected",
              "version": "11ea3173d5f2de71d037ef58ac43395795fed2bc",
              "versionType": "git"
            },
            {
              "lessThan": "70e4248793762df9832fd4fc2fc6ac7924572c36",
              "status": "affected",
              "version": "11ea3173d5f2de71d037ef58ac43395795fed2bc",
              "versionType": "git"
            },
            {
              "lessThan": "3e6f007b43e2fc6546e21fa74ee62c38984a6672",
              "status": "affected",
              "version": "11ea3173d5f2de71d037ef58ac43395795fed2bc",
              "versionType": "git"
            },
            {
              "lessThan": "a8d87184576c889759e3aab899799a482f1e1a5b",
              "status": "affected",
              "version": "11ea3173d5f2de71d037ef58ac43395795fed2bc",
              "versionType": "git"
            },
            {
              "lessThan": "478cdd736f2ce3114f90e775d7358136d3977b94",
              "status": "affected",
              "version": "11ea3173d5f2de71d037ef58ac43395795fed2bc",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/touchscreen/touchwin.c"
          ],
          "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"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-07-25T08:49:18.160Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ed9b66905407eb3d02df1aaeed82eb7a7f0eb508"
        },
        {
          "url": "https://git.kernel.org/stable/c/044167cba2384bcd783547ad5e30ecd292b30919"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c9f29f128dd4057404838259af4c645318487e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/431ad239f2924dff337c3fccb9246597c1b63185"
        },
        {
          "url": "https://git.kernel.org/stable/c/70e4248793762df9832fd4fc2fc6ac7924572c36"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e6f007b43e2fc6546e21fa74ee62c38984a6672"
        },
        {
          "url": "https://git.kernel.org/stable/c/a8d87184576c889759e3aab899799a482f1e1a5b"
        },
        {
          "url": "https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94"
        }
      ],
      "title": "Input: touchwin - reset the packet index on every complete packet",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-07-25T08:49:18.160Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64271",
      "date": "2026-07-27",
      "epss": "0.00211",
      "percentile": "0.11432"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-26T01:03:56.000Z",
      "cve": "CVE-2026-64271",
      "id": "msrc_CVE-2026-64271",
      "initial_release_date": "2026-07-26T01:03:56.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Input: touchwin - reset the packet index on every complete packet",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64271.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64271\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:07.410\",\"lastModified\":\"2026-07-25T10:17:07.410\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/input/touchscreen/touchwin.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"11ea3173d5f2de71d037ef58ac43395795fed2bc\",\"lessThan\":\"ed9b66905407eb3d02df1aaeed82eb7a7f0eb508\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11ea3173d5f2de71d037ef58ac43395795fed2bc\",\"lessThan\":\"044167cba2384bcd783547ad5e30ecd292b30919\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11ea3173d5f2de71d037ef58ac43395795fed2bc\",\"lessThan\":\"6c9f29f128dd4057404838259af4c645318487e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11ea3173d5f2de71d037ef58ac43395795fed2bc\",\"lessThan\":\"431ad239f2924dff337c3fccb9246597c1b63185\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11ea3173d5f2de71d037ef58ac43395795fed2bc\",\"lessThan\":\"70e4248793762df9832fd4fc2fc6ac7924572c36\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11ea3173d5f2de71d037ef58ac43395795fed2bc\",\"lessThan\":\"3e6f007b43e2fc6546e21fa74ee62c38984a6672\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11ea3173d5f2de71d037ef58ac43395795fed2bc\",\"lessThan\":\"a8d87184576c889759e3aab899799a482f1e1a5b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"11ea3173d5f2de71d037ef58ac43395795fed2bc\",\"lessThan\":\"478cdd736f2ce3114f90e775d7358136d3977b94\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/input/touchscreen/touchwin.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/044167cba2384bcd783547ad5e30ecd292b30919\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e6f007b43e2fc6546e21fa74ee62c38984a6672\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/431ad239f2924dff337c3fccb9246597c1b63185\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c9f29f128dd4057404838259af4c645318487e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/70e4248793762df9832fd4fc2fc6ac7924572c36\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a8d87184576c889759e3aab899799a482f1e1a5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ed9b66905407eb3d02df1aaeed82eb7a7f0eb508\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:46:53Z",
      "cve": "CVE-2026-64271",
      "id": "CVE-2026-64271",
      "initial_release_date": "2026-07-25T16:46:53Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64271",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64271.json",
      "version": "2"
    }
  }
}



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.