CVE-2026-23338 drm/amdgpu/userq: Do not allow userspace to trivially triger kernel warnings

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/userq: Do not allow userspace to trivially triger kernel warnings Userspace can either deliberately pass in the too small numfences, or the required number can legitimately grow between the two calls to the userq wait...