CVE-2026-80566Input: hynitron_cstxxx - validate touch count and finger IDs
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: Input: hynitron_cstxxx - validate touch count and finger IDs The driver allocates max_touch_num input slots, which are indexed from zero through max_touch_num - 1. The current check allows a finger ID equal to max_touch_num to reach cst3xx_report_contact(). While the input core ignores out-of-range slot indices, reporting touch data without a valid slot change corrupts the touch state of the previously active slot. The touch count is read from the controller's report and is used to index the fixed-size report buffer without first checking its range. Reject counts larger than the supported number of touch slots before checking the trailing byte or parsing touch data. Reject finger IDs equal to or greater than max_touch_num, and return immediately when an invalid finger ID is encountered so that corrupt touch frames are discarded instead of reporting partial contact state. The V821 Avaota F1 board configures the vendor driver with one touch slot, so finger ID 1 is already invalid on that device.
- CVSS
- Not yet scored
- 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
- Received
- Record last updated
- Aug 26, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 66603243f5283f7f28c795f09e7c2167233df0bd before ec61ca4e310665816a639cb2e46cd9b3af0a9bee; 66603243f5283f7f28c795f09e7c2167233df0bd builds before 387829ee60de26c7c073ed4e27ecfab2b75d4c74; 66603243f5283f7f28c795f09e7c2167233df0bd builds before 38e7d5c1ade04b99c70da0298ca296ee62bc99c0; 66603243f5283f7f28c795f09e7c2167233df0bd builds before 51c5503554c87e4de4035468bebf186205391ce9; 66603243f5283f7f28c795f09e7c2167233df0bd builds before 27f380ef0e1d3de3cde114e02d33f9320ce3a5a6 | CNA record |
References
- https://git.kernel.org/stable/c/ec61ca4e310665816a639cb2e46cd9b3af0a9bee
- https://git.kernel.org/stable/c/387829ee60de26c7c073ed4e27ecfab2b75d4c74
- https://git.kernel.org/stable/c/38e7d5c1ade04b99c70da0298ca296ee62bc99c0
- https://git.kernel.org/stable/c/51c5503554c87e4de4035468bebf186205391ce9
- https://git.kernel.org/stable/c/27f380ef0e1d3de3cde114e02d33f9320ce3a5a6
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.