{"id":"CVE-2026-64271","title":"Input: touchwin - reset the packet index on every complete packet","summary":"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 in…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < ed9b66905407eb3d02df1aaeed82eb7a7f0eb508","Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 044167cba2384bcd783547ad5e30ecd292b30919","Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 6c9f29f128dd4057404838259af4c645318487e1","Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 431ad239f2924dff337c3fccb9246597c1b63185","Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 70e4248793762df9832fd4fc2fc6ac7924572c36","Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 3e6f007b43e2fc6546e21fa74ee62c38984a6672","Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < a8d87184576c889759e3aab899799a482f1e1a5b","Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 478cdd736f2ce3114f90e775d7358136d3977b94","Linux 2.6.19"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:33:29.534544Z"},"published":"2026-07-25","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:34:31.989Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64271","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"}],"tags":["cve.org"],"epss":0.00169,"epssPercentile":0.06243,"ingestedAt":"2026-11-06T16:57:43.212Z","slug":"CVE-2026-64271","body":"## Overview\n\nIn 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->data[tw->idx++] = data;\n\tif (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) {\n\t\t...\n\t\ttw->idx = 0;\n\t}\n\nThe reset is gated on tw->data[1] == tw->data[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->data[tw->idx++] 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.\n\n## Affected\n\n- `Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < ed9b66905407eb3d02df1aaeed82eb7a7f0eb508`\n- `Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 044167cba2384bcd783547ad5e30ecd292b30919`\n- `Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 6c9f29f128dd4057404838259af4c645318487e1`\n- `Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 431ad239f2924dff337c3fccb9246597c1b63185`\n- `Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 70e4248793762df9832fd4fc2fc6ac7924572c36`\n- `Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 3e6f007b43e2fc6546e21fa74ee62c38984a6672`\n- `Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < a8d87184576c889759e3aab899799a482f1e1a5b`\n- `Linux >= 11ea3173d5f2de71d037ef58ac43395795fed2bc < 478cdd736f2ce3114f90e775d7358136d3977b94`\n- `Linux 2.6.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}