CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of buffer objects in the host1x graphics subsystem, where cached mappings could prevent the underlying buffer object from being freed, leading to potential memory leaks. This issue could impact systems utilizing the TegraDRM GEM buffers, as the inability to free cached buffer objects may degrade performance or exhaust memory resources. Organizations using Linux with Tegra hardware should prioritize addressing this vulnerability to ensure optimal system resource management and stability.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: gpu: host1x: Allow entries in BO caches to be freed When a buffer object is pinned via host1x_bo_pin() with a cache, the resulting mapping is kept in the cache so it can be reused on subsequent pins. Each mapping held a reference to the underlying host1x_bo (taken in tegra_bo_pin / gather_bo_pin), so as long as a mapping was cached, the bo itself could not be freed. However, the only way to remove the cached mapping was through the free path of the buffer object. This meant that if a bo got cached, it could never get freed again. Resolve the circularity by holding a weak reference to the bo from the cache side. This is done by having the .pin callbacks not bump the bo's refcount -- instead the common Host1x bo code does so, except for the cache reference. Also move the remove-cache-mapping-on-free code into a common function inside Host1x code. This is only called from the TegraDRM GEM buffers since those are the only ones that can be cached at the moment.