CVE-2026-19576 (GCVE-0-2026-19576)
Vulnerability from cvelistv5 – Published: 2026-10-11 17:14 – Updated: 2026-10-11 17:14
VLAI
EPSS
VEX
Title
Stack out-of-bounds write in the Goodix GT911 touch controller driver from an unvalidated device-reported touch point count
Summary
The Goodix GT9xx input driver in drivers/input/input_gt911.c reads the touch point count from the controller's status register and masks it with GT911_TOUCH_POINTS_MSK (0x0F), yielding a value of 0..15. In gt911_process() that value is used directly as the loop bound for filling point_reg[], a stack array sized to CONFIG_INPUT_GT911_MAX_TOUCH_POINTS, whose Kconfig range is 1..5 with a default of 1. No other check constrains the count; the driver relied only on a comment asserting that the controller had been programmed at init to report no more points than configured.
Each loop iteration issues an I2C read of eight bytes straight into point_reg[i], so a controller that reports more points than the array holds causes up to 112 bytes of peer-supplied data to be written past the end of the array, over the stack frame of gt911_process() in the system workqueue thread. Two further loops then read out of bounds from the same array. Triggering it requires control of, or the ability to substitute, the I2C touch controller — plausible on the many supported boards where the GT9xx panel is a pluggable display module or shield rather than an on-PCB part; a spoofed device need only answer the init probes with a supported product ID and a checksum-valid config blob. The same overflow can also occur non-adversarially, with a GT9271-class panel that ignores the driver's touch-count programming and reports up to ten points, or with bus corruption of the single status byte.
The impact is an out-of-bounds stack write with fully attacker-chosen content executing at kernel privilege, i.e. potential control-flow hijack on the host MCU, in addition to out-of-bounds reads and crashes. The attack vector is physical/local hardware access only; there is no network, USB, or syscall path to the defect. The fix clamps the reported count with min() against CONFIG_INPUT_GT911_MAX_TOUCH_POINTS before any array indexing.
Severity
6.8 (Medium)
CWE
- CWE-787 - bounds
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| zephyrproject | zephyr |
Affected:
4.0.0 , ≤ 4.4.2
(semver)
|
guessed |
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"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p7qh-fvwx-f7vr"
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"title": "Stack out-of-bounds write in the Goodix GT911 touch controller driver from an unvalidated device-reported touch point count",
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}
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"id": "CVE-2026-19576",
"lastModified": "2026-10-13T16:53:44.693",
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