CVE-2026-68205
Low risk· EPSS 11%Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel, in the v4l2_async_register_subdev_sensor() function, there is an issue with overwriting the subdev owner. The v4l2_async_register_subdev() macro expands to __v4l2_async_register_subdev(sd, THIS_MODULE), but since it is called inside v4l2-fwnode.c, THIS_MODULE resolves to the v4l2-fwnode module rather than the sensor driver module. When v4l2-fwnode is built-in, THIS_MODULE evaluates to NULL, which overwrites the sensor driver's owner with NULL.
Risk Assessment
This causes the sensor module's reference count to never be incremented during async registration, allowing the module to be removed while the subdevice is still in use by a notifier, potentially leading to use-after-free.
Recommendation
Apply the Linux kernel patch that renames the function to __v4l2_async_register_subdev_sensor() with an explicit module argument and introduces a wrapper macro to ensure proper sensor module referencing.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: media: v4l2-fwnode: Fix subdev owner overwritten in v4l2_async_register_subdev_sensor() The v4l2 helper v4l2_async_register_subdev_sensor() calls v4l2_async_register_subdev(), which is a macro that expands to __v4l2_async_register_subdev(sd,THIS_MODULE). Since the macro is expanded inside v4l2-fwnode.c, THIS_MODULE resolves to the v4l2-fwnode module rather than the sensor driver module that originally set sd->owner. When v4l2-fwnode is built-in, THIS_MODULE evaluates to NULL, which then overwrites the sensor driver's owner with NULL. This causes the problem that the sensor module's reference count is never incremented during async registration, so the module can be removed while the subdevice is still in use by a notifier (e.g., a CSI-2 receiver bridge driver). Fix this by renaming v4l2_async_register_subdev_sensor() to __v4l2_async_register_subdev_sensor() with an added explicit module argument and introducing a wrapper macro: #define v4l2_async_register_subdev_sensor(sd) \ __v4l2_async_register_subdev_sensor(sd, THIS_MODULE) This ensures the sensor driver module is properly referenced even when the sensor driver does not init the owner field before calling v4l2_async_register_subdev_sensor() and prevents premature module removal.