CVE-2026-19576
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
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 0x0F, yielding a value of 0..15. This value is used directly as the loop bound for filling the stack array point_reg[], sized to CONFIG_INPUT_GT911_MAX_TOUCH_POINTS (Kconfig range 1..5, default 1). A controller reporting more points than the array holds causes up to 112 bytes of peer-supplied data to be written past the end of the array on the system workqueue thread's stack.
Risk Assessment
The vulnerability allows an out-of-bounds stack write in the kernel with attacker-chosen content, potentially leading to control-flow hijack at kernel privilege, as well as out-of-bounds reads and crashes. It requires physical access to or substitution of the I2C touch controller, so it mainly affects devices with pluggable GT9xx display modules.
Recommendation
Update the kernel to a version containing the fix that clamps the reported count with min() against CONFIG_INPUT_GT911_MAX_TOUCH_POINTS before any array indexing. If updating is not possible, consider restricting physical access to the touch controller connector or disabling the driver on devices that do not require it.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS