{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "11ea3173d5f2de71d037ef58ac43395795fed2bc"
            },
            {
              "fixed": "ed9b66905407eb3d02df1aaeed82eb7a7f0eb508"
            },
            {
              "fixed": "044167cba2384bcd783547ad5e30ecd292b30919"
            },
            {
              "fixed": "6c9f29f128dd4057404838259af4c645318487e1"
            },
            {
              "fixed": "431ad239f2924dff337c3fccb9246597c1b63185"
            },
            {
              "fixed": "70e4248793762df9832fd4fc2fc6ac7924572c36"
            },
            {
              "fixed": "3e6f007b43e2fc6546e21fa74ee62c38984a6672"
            },
            {
              "fixed": "a8d87184576c889759e3aab899799a482f1e1a5b"
            },
            {
              "fixed": "478cdd736f2ce3114f90e775d7358136d3977b94"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.19"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64271.json"
  },
  "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's 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": "CVE-2026-64271",
  "modified": "2026-08-18T03:30:50.075707027Z",
  "published": "2026-07-25T08:49:18.160Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64271.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64271"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Input: touchwin - reset the packet index on every complete packet"
}