CVE-2026-72063
Low risk· EPSS 11%Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel, a vulnerability was found in the Tegra GPIO driver where pinctrl functions are called for GPIO direction, even though the GPIO driver programs direction registers directly. This redundant call enters the pinctrl core and can sleep in an atomic context when shared GPIO users hold a spinlock. The issue was confirmed by static analysis and manual code review.
Risk Assessment
The risk involves potential system hang or deadlock due to sleeping in an atomic context, which could lead to system crash or DoS. The vulnerability affects systems with Tegra processors using shared GPIO lines.
Recommendation
Apply the kernel patch that removes the redundant pinctrl_gpio_direction_input/output() calls in tegra_gpio_direction_input/output(). Update the kernel to a version containing this fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: gpio: tegra: do not call pinctrl for GPIO direction tegra_gpio_direction_input() and tegra_gpio_direction_output() already program the GPIO controller direction registers directly. The additional pinctrl_gpio_direction_input/output() calls do not add a Tegra pinctrl operation, because the Tegra pinmux ops provide GPIO request/free handling but no gpio_set_direction hook. The extra call still enters the pinctrl core and takes pctldev->mutex. Shared GPIO users can call the direction path while holding their per-line spinlock, so this otherwise redundant pinctrl direction call can sleep in an atomic context. This was found by our static analysis tool and then confirmed by manual review of tegra_gpio_probe(), the Tegra GPIO direction callbacks and the Tegra pinctrl ops. The reviewed path has a default non-sleeping struct gpio_chip while the direction callback still enters the pinctrl mutex path. A directed runtime validation kept the same non-sleeping chip registration and drove: gpio_shared_proxy_direction_output() gpiod_direction_output_raw_commit() tegra_gpio_direction_output() pinctrl_gpio_direction_output() Lockdep reported a sleep-in-atomic warning with the shared GPIO spinlock held and pinctrl_get_device_gpio_range() plus tegra_gpio_direction_output() on the stack. Do not mark the whole chip as can_sleep to paper over this: can_sleep describes whether get()/set() may sleep, and Tegra value access is MMIO. Remove the redundant pinctrl direction calls and keep pinctrl involvement in the existing request/free path.