{"id":"CVE-2026-64271","state":"PUBLISHED","title":"Input: touchwin - reset the packet index on every complete packet","description":"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->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.","publishedAt":"2026-07-25T08:49:18.160Z","updatedAt":"2026-08-17T04:52:25.592Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"ed9b66905407eb3d02df1aaeed82eb7a7f0eb508","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"044167cba2384bcd783547ad5e30ecd292b30919","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"6c9f29f128dd4057404838259af4c645318487e1","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"431ad239f2924dff337c3fccb9246597c1b63185","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"70e4248793762df9832fd4fc2fc6ac7924572c36","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"3e6f007b43e2fc6546e21fa74ee62c38984a6672","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"a8d87184576c889759e3aab899799a482f1e1a5b","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"478cdd736f2ce3114f90e775d7358136d3977b94","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/touchscreen/touchwin.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/touchscreen/touchwin.c"]}],"references":["https://git.kernel.org/stable/c/ed9b66905407eb3d02df1aaeed82eb7a7f0eb508","https://git.kernel.org/stable/c/044167cba2384bcd783547ad5e30ecd292b30919","https://git.kernel.org/stable/c/6c9f29f128dd4057404838259af4c645318487e1","https://git.kernel.org/stable/c/431ad239f2924dff337c3fccb9246597c1b63185","https://git.kernel.org/stable/c/70e4248793762df9832fd4fc2fc6ac7924572c36","https://git.kernel.org/stable/c/3e6f007b43e2fc6546e21fa74ee62c38984a6672","https://git.kernel.org/stable/c/a8d87184576c889759e3aab899799a482f1e1a5b","https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64271.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64271","state":"PUBLISHED","datePublished":"2026-07-25T08:49:18.160Z","dateUpdated":"2026-08-17T04:52:25.592Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.775Z"},"containers":{"cna":{"title":"Input: touchwin - reset the packet index on every complete packet","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'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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"ed9b66905407eb3d02df1aaeed82eb7a7f0eb508","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"044167cba2384bcd783547ad5e30ecd292b30919","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"6c9f29f128dd4057404838259af4c645318487e1","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"431ad239f2924dff337c3fccb9246597c1b63185","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"70e4248793762df9832fd4fc2fc6ac7924572c36","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"3e6f007b43e2fc6546e21fa74ee62c38984a6672","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"a8d87184576c889759e3aab899799a482f1e1a5b","versionType":"git"},{"version":"11ea3173d5f2de71d037ef58ac43395795fed2bc","status":"affected","lessThan":"478cdd736f2ce3114f90e775d7358136d3977b94","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/touchscreen/touchwin.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/input/touchscreen/touchwin.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:52:25.592Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}