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.
References
Configurations
Configuration 1 (hide)
|
History
24 Oct 2026, 13:10
| Type | Values Removed | Values Added |
|---|---|---|
| Summary |
|
Information
Published : 2026-07-25 10:17
Updated : 2026-10-24 13:10
NVD link : CVE-2026-64271
Mitre link : CVE-2026-64271
CVE.ORG link : CVE-2026-64271
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-129
Improper Validation of Array Index