Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49

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

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ed9b66905407eb3d0…
https://git.kernel.org/stable/c/044167cba2384bcd7…
https://git.kernel.org/stable/c/6c9f29f128dd40574…
https://git.kernel.org/stable/c/431ad239f2924dff3…
https://git.kernel.org/stable/c/70e4248793762df98…
https://git.kernel.org/stable/c/3e6f007b43e2fc654…
https://git.kernel.org/stable/c/a8d87184576c88975…
https://git.kernel.org/stable/c/478cdd736f2ce3114…

Impacted products

2 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)
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)

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JSON

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          "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."
        }
      ],
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        "dateUpdated": "2026-07-25T08:49:18.160Z",
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    "datePublished": "2026-07-25T08:49:18.160Z",
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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"
    }
  }
}

GHSA-V33C-VVWM-9MR7

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64271"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:07Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-v33c-vvwm-9mr7",
  "modified": "2026-07-25T12:31:28Z",
  "published": "2026-07-25T12:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64271"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/044167cba2384bcd783547ad5e30ecd292b30919"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e6f007b43e2fc6546e21fa74ee62c38984a6672"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/431ad239f2924dff337c3fccb9246597c1b63185"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c9f29f128dd4057404838259af4c645318487e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70e4248793762df9832fd4fc2fc6ac7924572c36"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8d87184576c889759e3aab899799a482f1e1a5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed9b66905407eb3d02df1aaeed82eb7a7f0eb508"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

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

GHSA-V33C-VVWM-9MR7

Tags

Sightings

Nomenclature