CVE-2026-64271Input: touchwin - reset the packet index on every complete packet
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 11ea3173d5f2de71d037ef58ac43395795fed2bc before ed9b66905407eb3d02df1aaeed82eb7a7f0eb508; from 11ea3173d5f2de71d037ef58ac43395795fed2bc before 044167cba2384bcd783547ad5e30ecd292b30919; 11ea3173d5f2de71d037ef58ac43395795fed2bc builds before 6c9f29f128dd4057404838259af4c645318487e1; from 11ea3173d5f2de71d037ef58ac43395795fed2bc before 431ad239f2924dff337c3fccb9246597c1b63185; from 11ea3173d5f2de71d037ef58ac43395795fed2bc before 70e4248793762df9832fd4fc2fc6ac7924572c36; 11ea3173d5f2de71d037ef58ac43395795fed2bc builds before 3e6f007b43e2fc6546e21fa74ee62c38984a6672; from 11ea3173d5f2de71d037ef58ac43395795fed2bc before a8d87184576c889759e3aab899799a482f1e1a5b; from 11ea3173d5f2de71d037ef58ac43395795fed2bc before 478cdd736f2ce3114f90e775d7358136d3977b94 | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.19 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/ed9b66905407eb3d02df1aaeed82eb7a7f0eb508patch
- https://git.kernel.org/stable/c/044167cba2384bcd783547ad5e30ecd292b30919patch
- https://git.kernel.org/stable/c/6c9f29f128dd4057404838259af4c645318487e1patch
- https://git.kernel.org/stable/c/431ad239f2924dff337c3fccb9246597c1b63185patch
- https://git.kernel.org/stable/c/70e4248793762df9832fd4fc2fc6ac7924572c36patch
- https://git.kernel.org/stable/c/3e6f007b43e2fc6546e21fa74ee62c38984a6672patch
- https://git.kernel.org/stable/c/a8d87184576c889759e3aab899799a482f1e1a5bpatch
- https://git.kernel.org/stable/c/478cdd736f2ce3114f90e775d7358136d3977b94patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.