CVE-2026-64271 (GCVE-0-2026-64271)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:52
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 11ea3173d5f2de71d037ef58ac43395795fed2bc
Version: 11ea3173d5f2de71d037ef58ac43395795fed2bc
Version: 11ea3173d5f2de71d037ef58ac43395795fed2bc
Version: 11ea3173d5f2de71d037ef58ac43395795fed2bc
Version: 11ea3173d5f2de71d037ef58ac43395795fed2bc
Version: 11ea3173d5f2de71d037ef58ac43395795fed2bc
Version: 11ea3173d5f2de71d037ef58ac43395795fed2bc
Version: 11ea3173d5f2de71d037ef58ac43395795fed2bc
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{
  "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",
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          "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"
            },
            {
              "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"
            },
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              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
              ],
              "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": "2026-08-17T04:52:25.592Z",
        "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": "2026-08-17T04:52:25.592Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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