CVE-2026-98609drm/virtio: fix object leak when drm_gem_handle_create() fails

Official description

In the Linux kernel, the following vulnerability has been resolved: drm/virtio: fix object leak when drm_gem_handle_create() fails virtio_gpu_gem_create() owns the reference taken by virtio_gpu_object_create(). On the drm_gem_handle_create() error path it calls drm_gem_object_release() instead of dropping that reference. drm_gem_object_release() is the inverse of drm_gem_object_init() and does not touch the reference count or call obj->funcs->free(), so it is only correct as the last step of a destructor, as in virtio_gpu_cleanup_object(). Using it here leaves the bo at refcount 1 with no remaining reference, so virtio_gpu_free_object() never runs and the shmem pages, sg table and virtio_gpu_object are leaked. Since virtio_gpu_object_create() has already set bo->created, VIRTIO_GPU_CMD_RESOURCE_UNREF is not queued either, leaking the host-side resource and the resource id. drm_gem_handle_create_tail() drops the handle reference on all of its internal error paths, so the caller only has to drop its own. Use drm_gem_object_put(), matching the success path below.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/13423a058187c2039aa8cb235c916be4477221b7
• https://git.kernel.org/stable/c/687be2f8b5e0e0ca9a7028f8f6413d0ed3fbb9dc
• https://git.kernel.org/stable/c/264ae8ac8fd625b6c118baf16c111adeee2ec632
• https://git.kernel.org/stable/c/e2edd2d78d2cf8446de017adec9598feefed3297
• https://git.kernel.org/stable/c/372e9c3d45f664a2c000427ccbf6cdc2f99b3170
• https://git.kernel.org/stable/c/a93dce15dfef200c346b050a2acbed516cc62706
• https://git.kernel.org/stable/c/f75066c79d1eec453c0d386ef8636873d1e11f2c
• https://git.kernel.org/stable/c/36570ef2244cc4d7563b1f0157bc0f032498638c